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General Minitrail Talk
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New rebuild, new carb, wont idle
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<blockquote data-quote="69ST" data-source="post: 189691" data-attributes="member: 5"><p>Stock, they're all geared for the same ~4.8mph/1000rpm in top gear. So it should've been spinning ~10000rpm, stock, at 47mph. That's 3 & 4 speeds alike. They don't like to pull more than that, in stock form. With a 52mm bore-up, low 5s is about all the torque can handle. Calculating sprocket changes is easy enough, using percentages.</p><p></p><p>FYI...it's been a long time since I crunched the numbers on a 4 speed. As I recall, both 44 & 45t wheel sprockets were listed in the parts manual. I suppose it's possible that some may have run 44 or 45t at the wheel and either 14 or 15t on the C/S. The tallest gearing would have been 2.93, the shortest 3.21. Mathematically, 10% taller would be between 3.21 (16/46t) to 2.64 (16/42t). None of this changes the fact that it's now slower. Some testing is called for. IDK, maybe try the stock sprocket combo, just to get a baseline. If top speed goes down, then you're way undergeared...time to try giving it some longer legs and retesting.</p></blockquote><p></p>
[QUOTE="69ST, post: 189691, member: 5"] Stock, they're all geared for the same ~4.8mph/1000rpm in top gear. So it should've been spinning ~10000rpm, stock, at 47mph. That's 3 & 4 speeds alike. They don't like to pull more than that, in stock form. With a 52mm bore-up, low 5s is about all the torque can handle. Calculating sprocket changes is easy enough, using percentages. FYI...it's been a long time since I crunched the numbers on a 4 speed. As I recall, both 44 & 45t wheel sprockets were listed in the parts manual. I suppose it's possible that some may have run 44 or 45t at the wheel and either 14 or 15t on the C/S. The tallest gearing would have been 2.93, the shortest 3.21. Mathematically, 10% taller would be between 3.21 (16/46t) to 2.64 (16/42t). None of this changes the fact that it's now slower. Some testing is called for. IDK, maybe try the stock sprocket combo, just to get a baseline. If top speed goes down, then you're way undergeared...time to try giving it some longer legs and retesting. [/QUOTE]
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General Minitrail Talk
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New rebuild, new carb, wont idle
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