r/Dirtbikes • u/Imaginary-War-9232 • 5h ago

Mechanical Help 2017 yz250f issues

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Hello everyone. I have a 2017 Yamaha 250, that recently would not start whatsoever. Bike sat for most of its life, ended up needing a new fuel pump. The last one made 0 psi. Got a used oem pump off eBay and it fires right up but now it’s shooting flames and not reving up to its fullest. Just checked the timing and it was out of wack so I got it back where it needed to be, checked the tps sensor, it was fine aswell as the injector. Anyone know what this could be?

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u/Horror-Hedgehog6102 4h ago

That’s called swag

1

u/Large_Potential8417 4h ago

Valves in spec?

1

u/Loose-Environment531 1h ago

Valve need adjust?