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Engine boggs down & wont let me plane

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spryd2

New member
2004 Yamaha VX 200 TLRC Fuel Injected. When I start engine, let it warm up, push throttle down it boggs down & won't get on plane. I've replaced fuel injectors, fuel pump filter on bottom of fuel pump, replaced the 3 fuel pump assemblies, I've run a compression test - around 108 PSI on every cylinder, run a fuel pressure test - 35 PSI steady; engine will pick up RPM if u hv the trim all the way up but will only run 4200 RPM. Anyone have any ideas about what the problem is & how to fix it?
 
spryd2 said:
2004 Yamaha VX 200 TLRC Fuel Injected. When I start engine, let it warm up, push throttle down it boggs down & won't get on plane. I've replaced fuel injectors, fuel pump filter on bottom of fuel pump, replaced the 3 fuel pump assemblies, I've run a compression test - around 108 PSI on every cylinder, run a fuel pressure test - 35 PSI steady; engine will pick up RPM if u hv the trim all the way up but will only run 4200 RPM. Anyone have any ideas about what the problem is & how to fix it?
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I had this problem with my older honda 4stroke. Mine would fire up fine and then never get beyond 3000 rpms UNDER LOAD so the dealers couldn't replicate it at their shop. You should try running it on an external fuel tank to make sure it's not tank/bulb related. When the engine is not under load it was fine and would rev to higher levels.

Mine turned out to be the low pressure fuel pump which is mechanical and only works once your engine reaches a certain rpm. I fixed it myself for about 150, dealer was trying to say it was a cracked head and was going to charge me thousands.
 
Thanks for the reply I have two fuel tanks it doesn't matter which one I use it still boggs down already replace all three mechanical fuel pumps drained all the fuel n checked fuel tank pick ups . bulb stays hard when it will get on plain replace all coils don't think I have a misfire more fuel related hard to figure out
 
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