Question about 2003 Yamaha YZ 125

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Engine starts but won't stay running.

Why does engine start but won't stay running?

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Check idle level. It should be a big knurled screw on the side or bottom of carb.

Posted on Aug 01, 2009

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1 Answer

Car won't stay running


If the problem only happens when the engine is cold, a bad electric sensor is likely to blame. If the car stalls even when the engine is warm, the cause is likely a faulty electric fuel pump.

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Probably not. Once the oil passages inside the engine get plugged up the block has to be hot-tanked to get them cleaned out. Thats after the engine is disassembled.
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You may not be getting power to the fuel pump if oil pressure is low.

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