Question about 2003 Yamaha YZ 125

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Not running right stalls almost wants 2ed gear no balls

Need advise

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Could be a whole bunch of things. make sure you have a good clean tank of gas, a clean air filter, and a fresh spark plug are just a few basic items that can cause such an issue. i would also suggest buying a spark tester. you just clip it on the engine somewhere and connect the plug wire to it, and when you kick it over you can check the intensity of the spark. also i would remove and clean the carb just too make sure that there is no sludge built up and blocking the jets or keeping the float from sticking up. another thing to check is the compression. you can buy a compression gauge at some auto parts stores, or tool department. the reading should be around 130-150. if you have low compression then you could have bad rings, blown headgasket, bad valves or something else along that line. also remove the exhaust and make sure no critters are stuck up in there because if you cant get proper exhaust flow it wont run properly.

Posted on Jan 13, 2009

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what transmission mine was 5speed manual stick , is yours?

ever do the 60,000 mile tune up, all service points under that column?
tune ups do work and have pay back in fuel savings.
" if in gas so much" i cant noodle that.....????
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