Question about Motorcycles
If it consistently shuts down when it warms up you are probably losing ignition. It sounds like you have a weak ignition coil. There is two or three different adjustments you can make to the carb. Idol speed, low speed mixture screw(pilot) and high speed mixture screw(main jet) If you can get a good vid of the carb I can direct you
Posted on May 02, 2013
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Posted on Jan 02, 2017
It does sound like an ignition timing problem, but could also be a breathing issue, air flow in or exhaust flow out could be restricted i.e.:dirty air filter, excessive carbon build up in exhaust pipe from burning too much oil or rich fuel mixture.
possibly and more likely some junk got into your fuel system and partially plugged up the main jet in the carb, -or has the needle on the slide been moved? The little circlip at the top of the needle, if it has one.
1.Replace the spark plug, check gap, check spark, it should be bright blue and fat.
2. check the fuel filter, if no filter check the carb for dirt.
Posted on Jan 20, 2009
SOURCE: Yamaha Riva won't idol
Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. 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 may 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. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
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Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Be sure the bolts are tight. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road.
Posted on Apr 07, 2009
SOURCE: Ignition Fuse keeps blowing
From another forum,
"You've got an exposed hot wire somewhere in the power circuit that's grounding out and causing resistance in the wire. Not sure how to help on this one, electrical problems are damn near invisible, but I'd start looking for a burn mark or scorched insulation on any of the wiring leading up the relay, starter, or main fuze block in the tail."
Posted on Jun 11, 2009
What has been done to the bike resently? If you havent changed anything with the air intake or the exhaust then you my have carb problems.
Posted on Sep 29, 2009
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