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Hello, I have two yamaha 300 hpdi 2-strokes and the left one keeps dropping out to 2000rpms when im at wide open throttle for a while i have checked for faults in the ecu but none have been recorded and i get no alarms could this be a fuel restriction, i have already replaced all feul filters.

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Possible a pinched line...also run with cowling off to try to get it to stop. If it fixes it then you have an exhaust leak under the cowling that is choking it out.

Posted on Aug 06, 2009

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Hard starting on Yamaha 130 2 stroke. Always starts easily with ether. Choke works well.


This can have some reasons:
1 clogged carburettors. Too less fuel means a hard start.
2 Worn spark plugs
3 Loss of compression... On a 2-stroke, measuring compression is not an exact science. Have throttle wide open. No spark plugs, check compression on all cylinders. They should be all within 1bar from eachother...

Aug 02, 2017 | Yamaha 40N/50N 40 and 50 HP Outboard Motor...

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Where is the oil filter for 2 stroke oil on 200 hp hpdi


Hi, Ron for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Yamaha HPDI Oil Filter The Hull Truth Boating and Fishing Forum
http://www.tidalfish.com/forums/showthread.php/250692-HPDI-owners-Cleaning-your-VST-filter
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Jun 23, 2016 | Motorcycles

1 Answer

I got a 1996 polaris xplorer 300 4x4 2 stroke. bike shutt off wouldnt start.some how fuel got in to the head .drained fuel out,have good comprestion still what do i do next


fuel can get into the head because the needle and seat if the carby is stuck open
the mixture ( in this fuel) is sucked into the crankcase during the up stroke of the piston then bypassed into the combustion chamber when the piston reaches a point on the down stroke
ONe fix is to shut of the fuel , fix the carby open the throttle wide , remove the plug and spin the engine over to remove all the fuel out of the crankcase
IT is effect very flooded now

May 26, 2016 | ATVs

1 Answer

What should my carb settings be on a 98 yz 250,all pro-circuit exhaust,living in timmins ontario,im running 91 octane


Hi, Anonymous it should be noted that your performance issues are not electrical ie. faulty charging system, battery condition, and connections etc. If your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues. For more information about your issue and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have nice a day.
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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1 Answer

Yamaha hpdi 225 2 stroke throttle problems will engage in reverse but not forward


Your gear selector cable may only require a simple adjustment.They can and do stretch.Hope this helps

Aug 22, 2010 | Bass Pro Boating

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I have no spark..thinking coil? also does anyone know what the compression should be on a tm 300 two stroke engine? I am getting 90lbs reading. thanks


Make sure you do the compression with the throttle wide open. (And a clean air filter) You need at least 100 psi to run good. (Kick it untill the gauge needle stops climbing)

Aug 13, 2009 | 2004 TM Racing Mx 300

1 Answer

Throtle open wide


It has been 35 years since I worked on a 360 as a mechanic at Lynn's Yamaha in D.M. Iowa. You have one of the few left alive. Pull the air cleaner off and look at the slide in the throat of the carb. Does it move all the way up and down freely when you twist the throttle? Is there play at the top of the adjuster on top of the carb? I think your bike has an oil pump for the 2 stroke oil. Remove the front right cover plate, (I think it had a right casing cover separate from the pump cover), and look at the operation of the cable wire on the pump. Both the slide and the oil pump cables should have some free play.

Are there reeds on your carb? The reeds will be between the carb and the cylinder if you have them. Are any of the reeds cracked or broken? Are all reeds fully closing? What condition is the rubber between carb and manifold? Get back to me with the information and we can go from there.

Jun 14, 2009 | 1973 Yamaha DT 360

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