Just wanted to let some people know that dont already That if you buy a Lectron carb for your 400ex you dont have to do that messy job of destroying your thumbthrottle get a 250r thumbthrottle it works perfect with no modifications Hope this is helpful to someone I bought a Lectron for my ex and was told how to grind my thumbthrottle by 5 different people I just happened to have a 250r thumbthrottle laying around and tried it. Thanks.
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