yea, as jump already said, they do hold the throttle a bit for starting, if i hold mine at the idle screw, it wont start.... thats because it kind of over rides the idle screw with the pull
i could imagine it would be very hard to reproduce this, and it could destroy ur engine
what i did to increase my speed was tighten the spring connecting the throttle to the govener arm
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My Yerf Dog 30033
-Speedometer
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