Question about 2000 Yamaha DT 125 R

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Head gasket blew and since replacing it I've had nothing but problems from the power valve operation. originally when ignition switched on a sound used to come from the valve area as if it was opening and closing(zizz-zizz) now when switched on there's only one zizz as the valve moves. I've lost top-end (only 50mph). I opened the servo? for the valve,contains a motor and switch, and the motor seems to work o.k., but the switch only works in two of four positions ie. north,south,east and west. when current checked to the switch it only shows about 4.5 volts.HELP I'm desperate!!

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Swap your cables to the power valve around

Posted on Aug 02, 2009

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