Question about 2001 Yamaha SR 125
well better would be to take it to some mechanic.
Posted on May 28, 2009
The most likely cause of this is the crankshat pickup under the small cover on the side of th engine, this is the common part that fails from heat and vibration
Posted on May 21, 2009
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 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. Remove the two screws 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 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. 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.
Since you mentioned uneven idle revs, be sure the carb and manifold are on tight and also tighten the cylinder and head. Air leaks can screw up the idle.
Posted on May 20, 2009
I think this is a carb engine.
First replace spark plug, check air intake and filter and fuel filter, eventually replace them.
In that case the engine may be stopping when a mixture with too much fuel is getting dispensed by carb, and you need to wait for spark plug to dry before destarting. Try working on carb settings in that case.
Check also fuel pressure and compression using an hand gauge tool that can be purchased at any spares shop. If fuel pressure gets low at hot , then it may be a faulty fuel pump.
Check if problem pesists without the fuel tank cap, in that case replace cap.
Ensure that there is no fuel line blockage.
Also a faulty valve can cause similar problems.
Posted on May 19, 2009
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Posted on Jan 02, 2017
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