Question about 1978 Yamaha XS 650 SE

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Hello my bike is not starting very well, always

Hello it is verry hard to start my bike, when it is running and you turn up the gas trottle it stops / starts running (not smooth) ? Big explosions / in the exhausts (flames out of the exhaust)

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You might find one of two things,the carbureetors need cleaning out and rebalancing and is quite likely that the points are out of adjustment,the points on this model and most of the xs650 were critical in getteing right,i think you have a combination of a couple of small problems but get these two things sorted out and the bike should go a lot better

Posted on Jul 04, 2009

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Posted on Jan 02, 2017

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a hole in one float would not stop a multi cylnder bike, it would just make that carb flood

probably not the pick up coils as there are two and they wont fail together, and then come good again

Thanks for the extended question, much better than "my bike stopped whats wrong?"

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Bike starting problem


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 or bottom 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. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. 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.

Please rate this solution. Thanks!

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