94 gtx detonation
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  1. #1
    PWCToday Newbie
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    94 gtx detonation

    i have a 94 gtx with 657 engine, i have burned hole in dead center of mag piston 3 times. i have been told possibly bad mpem causing timing to advance. carbs good, new lines and fuel selector switch, rotary timing right and lined clicks up correctly on stator. original engine was seizing and slight detonation on exhaust side. i had fuel line problems wich caused that. could mpem just go bad just that quick and dose this sound like an mpem problem? thanks for any help.
    95 750 sts
    94 gtx

  2. #2
    PWCToday.com Is My Home Away From Home Tom V's Avatar
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    Re: 94 gtx detonation

    It could be the cdi but most of the time it is still carb related.
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  3. #3
    PWCToday Newbie
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    Re: 94 gtx detonation

    ok thanks for the response. i have rebuilt carbs with every engine swap. new kits , cleaned throughly , new fuel lines , selector switch cleaned fuel filter cleaned and new o ring installed. what am i missing that might cause it to lean out that bad on that cylinder? the first one i put in burnt a whole in 5 minutes . 2nd one made it through 10 min warm up and up to half throttle break in. burnt when proceeded further. sounded like it was leaning out so headed to shore didnt make it. im trying to avoid buying a new mpem and that not be it since there relatively exspenseve. do you know of any one who can test a mpem ?
    95 750 sts
    94 gtx

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