Yamaha outboard wont rev under load

Yamaha outboard wont rev under load. Mar 11, 2009 · Current Bike (s):1981 Yamaha XS400 Special 2. New to the forum. Apr 19, 2010. I took it to a reliable marine mechanic and I water coming into 2 cylinders. Over about 20 hours, the 4200 top dropped to 3200 and eventually to 1500. Sep 11, 2013 · New member. What you are seeing is completely normal. Its not good to rev up like that, if theres a fuel clog you're turning a cyl at 5K with no lubrication. I don't have a tachometer to see exactly the rpm value but my speed Jan 20, 2010 · 8,646. Purchased the carb kit, had a machine shop remove the broken tip from the Oct 8, 2015 · 10-08-2015, 08:34 AM. starts no problem idles no problem, runs at trolling speed no problem but soon as I throttle up engine sounds a bit rough, and won't give me more than 2000 rpm. Aug 21, 2015 · 08-21-2015, 10:03 PM. Got the boat home and when I put it in the water, it'll Apr 13, 2014 · Re: Yamaha 150 hpdi bogs down under load. History & Symptoms: I bought this boat last year and ran it for about 15 hours last year, without any problems, but noticed the oil plug was leaking. Clean Carburetor. If you would bet your life the fuel system is perfect,then. I have an old yamaha 70 2 stroke outbard engine code 6h3, beleive its 80s early 90s. --If the ignition system is in good shape the spark will jump a gap of 7/16" with ease. if its carbed, definately clean them, as thats first and foremost. But last on a clear day with not much wind current or waves, it will run at 5300 at WOT for a couple of minutes at 40 mph (pushing a 97 21 ft Kenner center 15hp strange loss of power. I have a 1993 Yamaha 3HP (3MSHR) that starts fine, idles fine, revs up just fine in neutral, but will not rev up when in gear and in the water. 290241. May 2, 2013 · I have a 40hp, 2 stroke Marinerbut the motor was built by Yamaha ('82 or '83). Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. He rebuilt the carbs and still could not get it to rev past 1500RPM under a load. Revs ok not under load but in gear will not rev up correctly. Sometimes it will be fine and you can cruise around all you want at WOT without missing a beat. the problem is sometimes it will not fully rev in gear, (is this the limp home mode?) iv only been on the water twice with it, 1st time it ran ok then did the loss of power thing, i stopped it, switched to back up May 28, 2012. She has been running rough and weak - sputters and bogs down under full throttle. It will only old 4000. Jul 4, 2011 · 07-18-2011, 11:59 PM. A timing light will quickly show if the dead cyl is sparking or not. Clean or replace the filters, and also drain any water from the fuel/water separator if you have one. I got a 2003 Yamaha 50 on a 16ft seaark. When I hold the throttle open from low rpm it’s fine until it gets on the pipe then it feels like a rev limiter or limp mode almost and you can just hold it like that and till you release the throttle it brings the rpm right down in this state as well. Mar 12, 2009 · Messages. Jun 20, 2015 · Jun 20, 2015. It will not rev under load but will hit rev limit if you trim out to take the load off the prop. Service during regularly scheduled annual checkups or every 100 hours of operation is recommended for outboards in normal recreational usage, annually or 500 hours for fishing guides or multiple-trip-per-week recreational fishermen. There is a relation between the propeller size and the rpm of the engine of the boat. compression on all three cylinders 150 psi. My mechanic said it idled just fine in the water tank. Pull the spark plugs & examine. Sep 11, 2013. Dec 4, 2013 · Dec 4, 2013. Out on the water last week, I had an afternoon where the outboard went from 3500rpm (happily on the plane) to about 1800rpm and it sounded very rough. . Boat is kept in Lake Tahoe (6200 elevation) Jason I am new Oct 18, 2021 · I have a 60efi the short shaft race version with 65hrs on it gen 1, 4 coil. 06-15-2013, 02:50 PM. The common culprits discussed below include:-A spun propeller-Boat propeller entangled with debris-Fuel line air leak-Corroded spark plug wiring Additionally, apart from the question of your engine operating at full power, we discuss what might be causing acceleration hesitation. I was topping out at 4200 RPMs on the port (should be 5200 or so). Reving your engine to 5500 in neutral is not a recommended practice. Basically, she'll start up fine and idle around 1500-2000 rpm (full choke) but upon going to 1/2 choke or giving her any throttle, she dies. It'll start straight back up again however, but then do it again. As for observing the carb slide opening, Remove the airbox, open the throttle and look inside the carb. If the motor is propped correctly (able to run at or near 6000 RPM with the boat loaded) then it may very well exceed the red line RPM (6000) when the boat is less than loaded. You may have to register before you can post: click the register link above to proceed. When this problem started, the boat ran great down the lake for about 5 milesthen started to slow down until it just bogged out. Don't just start tearing into things without an indication that is where the trouble lies. Classic symptom of clogged carb (s). Pretty common with EFI outboards. May 31, 2020 · New member. It will surge once you get it on plane and bounce back and forth between 4100 and 4000. Removing the carbs is a little cramped. Jul 7, 2014 · First things first: Troubleshoot. So he replaced the reed valves and that fixed the problem. Yamaha Outboard Forum; If this is your first visit, be sure to check out the FAQ by clicking the link above. rebuilt all three carbs Yamaha kits used. I have a 05 200 hpdi, when my hpdi starts bogging down when its put in gear, it is almost always is either the water seperating filter or the mid preasure filter (canester filter right above the VST tank. New to me a 1986 two stroke 90 Hp. Does not miss, does not sputter, just acts like that is all the power it has. I had a cracked intake gasket and he replaced that. Replace Fuel Filter. Any thoughts or direction to take would be appreciated. We managed to idled back to the ramp and took it home. i have a f115 yamaha manufacture date of o4/07 it won't rev past 4000 rpms i found a split in the fuel line at the tank, could it have been sucking air keeping the engine from reving up properly,thanks. Dec 18, 2017 · Check fuel pressure or just try squeezing the primer bulb in the fuel line when the engine is bogging. So my old Yamaha outboard once again has me stumped. The cause would be lack of fuel delivery. It is mounted on a tinny we bought about 5 years ago but has still down very little work. One of the first signs that the powerhead isn’t getting enough air or fuel is when the motor stalls, particularly when idling. Anywhere near 2mm deck and , guess,0. 22' Cuddy Bayrunner 115 Fourstroke Merc. It's customary to do a compression test and spark test first. Your problem has been going on for two years. Both run off the same fuel tank. Very hard to restartgot it startedran about a mile, then bogged out. #13. in in above 1400 or 1700 it drops two MORE cylinders for a total of 4 cylinders shut down. By addressing propeller issues, fuel system problems, ignition system malfunctions, air intake restrictions, and exhaust system blockages, you can 2. I have emptied and rinsed the gas tank with fresh fuel, put all new fuel in, replaced the large (oil filter sized) in-line Oct 5, 2018 · Here are his thoughts on Hesitation and Bogging Down On Applying Throttle. The motors needs to make power are few, Compression, you've nailed that one down, all looks fine as far as ring seal. 9. Oct 15, 2010. I sprayed a little bit of WD40 between the timing base and the stator Diagnosing High-RPM Power Loss. service manual for my 1996 P60TLHU. After about 15 minutes of operation the engine will lose power and revs only when a high load is put on the engine. Since you'll do both carbs (assuming compression and spark check out), the cylinder drop test is moot, but the fuel tank inspection is always a good idea. Here’s why a boat struggles to get on a plane or won’t plane at all. Oct 3, 2021 · I have a yamaha f40 2005 that started doing some weird stuff today. Starts up very well, idles and pulls out of the hole great. The coil assemblies of Mercury outboards (which are often referred to as "the stator") are somewhat infamous for being the source of Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. I have a 1990 Johnson 115 that bogs under load. 07-04-2015, 08:54 PM. I have a 2005 F150 Yamaha 4 stroke. I have emptied and rinsed the gas tank with fresh fuel, put all new fuel in, replaced the large (oil filter sized) in-line Mar 7, 2011 · Re: Full throttle and 2,500 RPM it will not go higher than that. It starts fine, it revs pretty high at first then once the revs settle, it'll splutter and then cut out. However, there could be many other reasons, but primarily those elements will cause a boat Nov 7, 2015 · The initial run of about 2KM the engine reved fine and the boat easily reached over 30 knots. Test the compression. Pull all wires that go into a wire connector very hard. 2000 200HP HPDI issues. After dewinterizing it and taking it out the boat will not rev passed 4000 rpm. If pressure falls of at RPM then you will need further testing and inspection of booth fuel pumps, fittings, and hoses. All the signs say not firing on all cyl's, troubleshooting will zero in on where and why. #2. There is a fitting on the fuel line to the injectors to attach a pressure gauge. To stop this problem i simply come back to 2003 Yamaha 90 HP Outboard Won't Rev-up passed 2,500 RPM! Has Good: Spark, Compression, Fuel and Clean CarbsThe fix to this problem was a bad fuel pump di Tweet. May 31, 2020. On my last outing over this past holiday weekend I had the followoing experience with my '86 150 2-stroke. Spark check on all cylinders. Oct 7, 2015 · Hi, my 2003 Merc 115 hp efi outboard has all of a sudden stopped working properly. It will rev 4500+ rpms. F. Re: mercury 60hp wont rev past 2500rpm under load. 2. Nov 27, 2017 · 999. Mar 23, 2013. Here are a few possible causes and solutions: Possible Cause: Dead or weak May 4, 2023 · Join Date: Sep 2006. After running the engine for about an hour, it begain to bog. This would drag down the needed rpms, affecting ignition. Your motor will rev up fine running on one cylinder in nuetral. Good chance that your injector (s) screens are clogged and/or your VST (vapor separator tank) needs servicing (cleaning) Good luck with the fix. If you haven't changed them in the last year, put in new plugs and try it you might get lucky. Cleaning the carbs is pretty straight forward. If it picks up, you found the cause -- not the problem. Pull the drain plugs & see if there is fuel in both carbs. I have a 2 Stroke Yamaha 30HP that is about 7-8 years old (I could confirm if that will help). Tweet. Slidell. probably fuel delivery, to check fuel pumps, you can visually inspect the diaphrams or my way,you can blow easily one way thru but none the otherif there is any bleedby the diaphram wont holdout the crankcase pressure. Built in 2000, I think it says model year 1999 on the label leading to the diag-port. Mounted on G3 185 Pro. Another probable reason your boat doesn’t go over 3000 rpm under load is that it has the wrong propeller. The plugs are all same color. No that gasket won't keep it from running right. Aug 25, 2012 · Yamaha 50 runs but no power, won't plane. Another possible reason your outboard motor is struggling to reach full speed is an air leak in your boat’s fuel line. I had a Yamaha 115hp 2 stroke with similar symptom, the timing base had a little rust and would not advance as the throttle is increased. Yamaha 15hp 2-stroke wont idle. This is a 2005 F90TLR that is idling fine, will run at low speeds (8 to 10 mph), but will not go any faster with the throttle wide open. Electronic choke looks fine and is in the vertical position once warm. #1. It becomes quite challenging to get the desired performance from a clogged carburetor when it doesn’t have proper access to fuel and oxygen for combustion. Newer, fuel-injected outboards can have as many as 12 of these filters—two or three primaries and one or more for each fuel injector. May 11, 2016 · Check your timing advance linkage. In the driveway with the muffs, runs fine, rev's Jul 15, 2021 · 2001 75hp yam 2stroke misfiring and bogging. no smoke, oil in motor, no carbon build up in exhaust. Sep 4, 2014 · 09-04-2014, 04:07 PM. Could not get the boat on plane. #8. Back to top. Check the gap on all the spark plugs. oil is changed every 3hrs. I had the injectors cleaned, drained the old gas, and put in new 93 octane gas with Sta-Bil and Yamaha Ring Free added. Mar 12, 2011 · f115 won't rev past 4000 rpm. LIT-18616-01-39. I notice that my outboard motor tends to stumble or misfire when accelerating under load if the spark plug gap is greater than the specified or recommended spark plug gap. the controls are basically the same. When the throttle was pushed forward it did not want to rev past 1800rpm, but (only as a quick test) I put it in neutral and blipped the Sep 8, 2010 · No power under load. Since then, we have checked all of the filters, fuel pressure, the fuel itself, and Sep 14, 2022 · Usually, when the high speed stator fails the outboard won’t go over 1800-2000 rpm’s. 3L block. Possible Reasons Why Your Boat Won’t Go Over 3000 RPM Under Load. One of the most common issues that Mercury 2-stroke outboard owners face is the engine’s failure to start. They should be a medium brown color. 6L block and the 3. Normally the clue to this type problem is that the engine starts fine on a flushette (hose), but is very difficult to start . Test the spark. The motor will start and idle all day long with out issue. I have replaced and clamped all fuel lines, vacuum lines and connections from the tank May 13, 2021 · On the simplest of outboard engines these are easily replaceable, often installed inline between the fuel inlet and the carburetor. 09-08-2010, 08:44 PM. Prior to my purchase the previous owner, a friend, said he cleaned the carbs. BUT throttle back down and there is a good chance it will stumble and hit a "rev limiter" a little past idle under load. engine code is M031680. #9. The dealer who sold me the boat asked me to bring it Feb 2, 2022 · A failed boat engine is usually caused by normal wear and tear as well as defective boat motor parts. Aug 6, 2008 · Posts: 360. Gets used for about 3 weeks each summer then it's back in the should for the year. This morning at daylight, launched the boat, engine is a little cold natured but after 5 minutes everything seemed normal. This motor runs very smooth and initially has great power at 5300 RPMs. Troubleshooting Engines Not Reaching Full RPM. May 31, 2011 · yamaha 70hp wont rev. The reed valve can be temperamental. hose from bulkhead to engine replaced, fuel filter cleaned and flows well, replaced fuel pump, Yamaha parts, spark on all three cylinders shows bright blue Jan 19, 2009 · Boat Name. Re: 90 HP Mercury won't accelerate past 3000 rpm. The problem is once I put it in gear and try to speed up, the motor will only get up to about 4 mph and then bog down. Mar 2, 2009. Along with the injectors in your outboard motor, clogged filters can also lead to a similar problem with the power. I have a 1996 115hp mercury tracker motor. Hi All, I have a 15hp (15fhm) 2 stroke and here is the issue. Feb 24, 2023 · Ideally, the power issue with the Yamaha outboard will be fixed after you clean the fuel injectors. Badly Chosen Prop. The bike hasn't been running to my knowledge for 4-5 months. Spring is well underway and we are about to roll into summer. Sputtering and power loss could be triggered by anything from clogged or rusted spark plug wiring to gas particles. In idle will rev up fine. When I put it in gear and take the pontoon boat out it will only rev up to 2500 rpm's. In neutral the boat revs to at least 5k, under a load,in gear it won't Rev past 4k. anyway it came with a boat that hasnt been in the water for 5 years, but it ran sweet when we started it. 05-31-2011, 05:08 PM. I've replaced the racor filter, new crank position sensor, cleaned carbs synced adjusted. Go into gear and idle fine. If it’s the wrong propeller size, the engine’s rpm will be affected. It will run all day at slow speeds and will rev fine in neutral but under heavier load it just dies. the 2. Since then, we have checked all of the filters, fuel pressure, the fuel itself, and Outboards typically have a WOT (Wide Open Throttle) rating, which gives you an RPM target for when the throttle is wide open. The right propeller size should be used in a boat. This is a new built boat so has new fuel tank vents open. Replaced gas in hopes it would run ok, but again the same problem. Replaced/Serviced: Apr 27, 2009 · We took it out on the water, boat starts and runs fine on muffs. Posted March 11, 2009. When the boat is out over the water and hooked up to the hose it will rev fine all they way past 5000rpm. When you pull the carb bowls off the carbs try to keep the gasket with the carb body and you might be able to reuse them. Smooth idle, excellent acceleration in neutral, no power issue in reverse, won't go above 2800 rpm in drive. I can recreate this by putting a kink in Jun 21, 2005 · year of motor to determine fuel system. Carburetor Linkages: Check the carburetor throttle Mar 16, 2013 · 3. Feb 2, 2022 · A failed boat engine is usually caused by normal wear and tear as well as defective boat motor parts. Posts: 493. Put it in water, try to go, starts out like it is going to take off, gets to about 1700 rpms and that is it. 160 posts. But when tested under a load; it would start to bog down and quit. These were the easiest carbs I have messed with. It will rev up to 5500 rpm's when in neutral out of water. It is currently Propped 14 1/4 18. So, if you’ve not replaced the fuel filters in a long while, then that is probably why the Yamaha Outboard Nov 23, 2016 · Loss of RPM at WOT. With your engine OFF, advance your throttle at the control and see if the timing advance linkage moves. This frustrating problem can be caused by a variety of factors. I have twin 2003 F225's with 200 hours and I think one is possessed. Member since Aug 2012. Feb 4, 2022 · We hope this read offers you valuable insights into why an outboard motor may not be running at full power. They can answer questions for any Yamaha outboard model or horsepower. Apr 19, 2010 · 29. #5. I've done all the obvious things to try rectify my problem. Weak plugs can do okay at idle but under load they won't provide enough spark to really fire the cylinders at high RPM. In neutral same issue, rpm won't come up. Engine always has and does start with no trouble even after Oct 17, 2013 · the Hpdi in 200 HP was made based on both the 2. It will run fine to 3800, you can baby it up to 4000-4100 but anymore else and it will drop to 3200 or so and surge back and forth. To start viewing messages, select the forum that you want to visit from the selection below. Some smaller or older outboards may not even have one. Fuel restriction between the pickup in the tank and the engine is the cause. at points with WOT it seems to try. Engine will idle fine. Not my first rodeo on this. Initially, the boat hopped right up on plane and the engine would run at 5000 rpm at full throttle. Jan 19, 2009. 5. On the way back to the dock, it threw a temperature alarm, and would not accelerate past 3000 RPMs. The starboard runs fine, the port is acting up. I finally took it out a few days ago and i cant get it to plane or rev up past 3500 rpm when its not under load it revs fine. After shutting off and restarting several times it would rev to the same rpm each time while under load. have changed to smaller prop, cleaned carb, emptied fuel tank and Tweet. Wrong Propeller. Re: 2000 yamaha 115 no power under load. The injectors may have been a key to the problem of not reving past 3000rpm. It's a wire, just a guess, anything this weird and long is usually a wire corroding almost all the way through in a wire connector. Hi folks. This is a common problem and is usually caused by a sticking timer base under the flywheel or fouled, clogged carburetors, however… also check the carburetor linkages, compression, spark, and the timer base as follows. A boat won’t plane out either due to a bad propeller, improper motor placement on the transom, wrong trim position, uneven weight distribution in the boat, low engine performance. Re: Mercury 115 EFI bogging down. Inspect the fuel filters and the air filter too if your outboard has one. I cleaned the carb changed jetting both ways “went richer and leaner Oct 16, 2010 · 6. 11-23-2016, 02:37 PM. May 12, 2006 · 28,765. 3. Jul 21, 2013 · Gold Medal Contributor. I have a 150 hp Four stroke outboard which would not go over 3200 rpm at full throttle. As a result, you will experience your outboard motor’s RPM fluctuating up and down. Hope that helps. Re: Outboard bogging down under load. VST pump inlet filter. #3. I would replace this filter first since you said above that you replaced the water seperating filter. We have replaced EVERY filter had injectors rebuilt and certified, had the VST cleaned 3x, plugs replaced and most recently We have also replaced the coil and leads. Most often than not, issues with not achieving the desired RPM can be traced back to a clogged carburetor. You need to start with the basics. So I pulled the carb and thoroughly cleaned it. Feb 10, 2022 · Yamaha Outboard Won’t Go Over 3000 RPM. May 30, 2023 · Mercury 2-Stroke Outboard Troubleshooting: Common Problems and Solutions 1. Here are a few possible causes and solutions: Possible Cause: Dead or weak Jan 19, 2009 · Boat Name. I suspected the carb and took it off, found the needle valve had broken off in the orifice. As soon as we put the boat it the water and press WOT the engine will only reach 3000rpm. Bought my boat last summer ran great, put sta-bil in the gas for the first time. May 31, 2018 · Garret_yz250. Engine Won’t Start. In case this happens, there will be a constant fluctuation in the fuel supply pumped into your boat’s carburetors. I've recently bought a 75hp yamaha 2 stroke. 3 to about 1700 RPM this is a given. Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams Feb 24, 2013 · Feb 24, 2013. Jul 1, 2023 · Dealing with a Yamaha outboard not reaching full RPM can be frustrating, but understanding the symptoms, causes, and potential solutions can help you navigate through the troubleshooting process. The revs were at about 5600 (Not full throttle) and all running fine. Sep 10, 2010 · I have a suzuki dt25c 1993, bought off ebay i will be honest its a bit of a dog. Started fine, idled smooth, but once in gear, engine "sputtered", run very rough, and I could not get it above 1500 RPM. May 6, 2011 · In the water, exhaust back pressure is encountered due to the fact that the exhaust housing (housing between the powerhead and the lower unit) is filled with water. KentuckyArcher. And one of the issues you may have with the boat motor is a lack of power. My 2004 Yamaha 40hp outboard loses power when under load. Jul 5, 2020 · Mercruiser 5. 07-01-2014, 03:04 PM. Your car can exceed the speed limit when going down a steep hill. Dec 9, 2022 · Please verify that you were at TRUE TDC and MEASURE the deck height and the head gasket thickness. 0 EFI Alpha One. Jun 8, 2012 · I just bought a new boat its a 1996 sea pro w/a with a 96 yamaha 150 hp 2 stroke. Diagnosing High-RPM Power Loss. 1. 6L up to 1400 RPM and the 3. If the RPMS are higher than the WOT rating when you have the throttle wide open, the prop is geared more toward acceleration, and you may be giving up speed. Removed in line fuel filter before primer, installed new impeller (low pressure from pee hole). Debris on Your Propeller. Then on the third run the engine would only get to about 3300 revs. Feb 21, 2012 · Feb 21, 2012. A few weeks ago, I was out fishing, and my 2012 F250 4-stroke started to lose RPMs, without any corresponding change in throttle position. #4. Posted on 8/25/12 at 9:16 am. New/Fresh E5 Fuel, New 8 mm bore fuel line and new Yamaha Jul 4, 2011 · 07-18-2011, 11:59 PM. Yamaha 50hp 2 stroke "stuttering" problems. However under load wont go past half power. The cdi box usually works or doesn’t work & the trigger tells the CDI box when to fire & would affect timing & how many of the coils fire. ---So start with a compression test and follow that up with a test to see if you have strong spark on both leads. It feels like it's not getting fuel. Compression check. I have a 93' Yamaha 30 MSHR that starts great, idles great but when I go past about 1/4 throttle the engine cuts out and will die if I don't back off to below 1/4 throttle. For example, when towing a tube and coming out of a circle, or when motoring through small waves or swell. Spark: Use a spark gap tester. Hi all, i am looking for some help i have a 1990 yamaha 2 stoke outboard and it wont rev under load, i used the boat for hour or so and ran purfect, then just as i was coming in it wasnt picking up on the plane as quick, started misfireing on idle then would cut out when throttle was released off full when it was ingear and Mar 7, 2011 · Re: Full throttle and 2,500 RPM it will not go higher than that. 5mm head gasket and the engine will surely be a dog. Blue Yellow. As I started to head back to the launch the motor would not rev to peak rpms under load. 90 hp mercury. a 1986 (i think) Yamaha 20hp, that will not rev to over half throttle under load, I by accident knocked off the petrol pipe when sitting down and as the engine actually ran out of petrol, it peaked and put the 16ft sea nymph straight up onto the plane for 5 secs before cutting out. Mar 6, 2017 · F115 won't rev over 3000rpm Amazing! Motor runs quite well now with injectors that have been professionally cleaned and new screens and o-rings installed. Sep 28, 2011 · Sep 28, 2011. Jan 20, 2010. Jul 3, 2012 · Right after idle under load it will start acting up. I have twin 200HP HPDI ( i believe Z200TRLY). Oct 18, 2010 · Oct 18, 2010. It started with a long continuous alarm but would still run ok, the merc tech had never seen the alarm before it was to do with 5volt system. Here's a similar post: F115 Bogging down - iboats Boating Forums. It revs freely to 5000 if its not in gear. And, May 23, 2023 · By the end of this guide, most of our readers should know exactly what is wrong with their boats! In This Article hide. May 27, 2017 · 2014 Yamaha fuel injected 40hp with 35 hours. It is the operators' job to not let the motor exceed 6000 RPM. Ignition, still undetermined, DVA testing stator output and/or verifying spark on all cyls when the problem arises still needs to be done. Engine will start up fine 1st pull. Jul 21, 2013. Before we took it out i chabged the box oil and replaced the impeller. Jun 24, 2021 · Fuel Line Air Leak. Good morning my name is***** Nevada. Besides - an engine running on half its cylinders will still rev freely. F90TLR 4 Stroke idles fine but won't get up to speed. Should jump 7/16" gap. On the other hand, if you open up the throttle and you can’t Check the Fuel and Air Filters. when on the water it ran half throttle at 3500 rpm and wide open throttle was no Sep 28, 2011 · Sep 28, 2011. P/N 6H2-28197-Z5-11. Pressure should remain steady from idle to WOT while under load. Nov 26, 2017. looks new under cowling. in N it drops two cylinders 2 and 3. May 13, 2006. Mar 24, 2014 · I had a similar problem on a Yamaha 50HP 2 stroke. lp oj us gt eg ms bk oi rk uv