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Hello I have a 2019 pw50 it starts no problem but will not rev up it kills the engine. I’ve checked the needle valve , blew out the jets and changed the air filter aswell as the plug any ideas what the problem can be??
Hey Anon, sounds like you may have done something wrong when reassembling your Blaster... When you "cleaned" the carb, you may have reassembled it incorrectly.. This sounds serious!!.... this situation is difficult to diagnose on-line.. I wish you were near me.. . (North Alabama) .. I am a 40+ years Yamaha Factory tech... I could fix it...
If this bike is carburettored, not EFI then you have damaged / bent the reed valves in the carby.
Remove carby which has the reed valves on the inlet side and you will see them bent. Replace with brand new, you are wasting your time to try and straighten them!!
ALWAYS have a fire extinguisher on hand when working on carburetors. Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ). Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.
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