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General Minitrail Talk
Tech Area
New rebuild, new carb, wont idle
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<blockquote data-quote="69ST" data-source="post: 189686" data-attributes="member: 5"><p>I get that. However, you said that top speed is down and that means lower peak rpm. </p><p></p><p>Typically, 3-speed/88cc tunes like 16t (one larger than stock) C/S and no more than 1t smaller at the wheel...all else the same. Procedure for dialing-in the sprocket combo, from scratch, is to upsize the C/S sprocket until the motor "falls on its face", then either drop back one tooth...or upsize the wheel sprocket by 1 tooth...effectively splitting the difference. FYI, a workable rule of thumb: "one at the CS equals two at the wheel".</p></blockquote><p></p>
[QUOTE="69ST, post: 189686, member: 5"] I get that. However, you said that top speed is down and that means lower peak rpm. Typically, 3-speed/88cc tunes like 16t (one larger than stock) C/S and no more than 1t smaller at the wheel...all else the same. Procedure for dialing-in the sprocket combo, from scratch, is to upsize the C/S sprocket until the motor "falls on its face", then either drop back one tooth...or upsize the wheel sprocket by 1 tooth...effectively splitting the difference. FYI, a workable rule of thumb: "one at the CS equals two at the wheel". [/QUOTE]
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General Minitrail Talk
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New rebuild, new carb, wont idle
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