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General Minitrail Talk
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S 90 grinding into 2nd gear
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<blockquote data-quote="69ST" data-source="post: 181767" data-attributes="member: 5"><p>I wasn't aware that this style of shift fork was used as early as the S90 era. This drum assembly looks sturdy, to say the least...right down to the threaded shift pin(!). Based on what I've seen with larger (100cc+) new-gen Honda engines, these forks are damn near bulletproof. If anything, the "weak link" in the chain is shift pin; since it's fixed (non-rotating) there's a chance of flat-spotting...which could cause problems. Consider, the floating pins are sometimes found worn and so evenly that you'd never realize they weren't machined with stepped-diameters...unless you've seen them new.</p><p></p><p></p><p>If the throttle sticks, then all bets are off. None of these transmissions will shift normally under load, even a partial load, and without coordinating throttle application.</p><p></p><p>Good idea to clean & lube the entire throttle operating assembly. Check cable action while you're at it; they can become arthritic over time. Might not hurt to either replace the return spring with a stiffer one, or give this one a gentle stretch. If the slide is binding inside the carb body, the high spots can be identified with Dykem, or black marker pen...then polished. Removing material from the slide is not a great idea but, a sticking throttle is worse.</p></blockquote><p></p>
[QUOTE="69ST, post: 181767, member: 5"] I wasn't aware that this style of shift fork was used as early as the S90 era. This drum assembly looks sturdy, to say the least...right down to the threaded shift pin(!). Based on what I've seen with larger (100cc+) new-gen Honda engines, these forks are damn near bulletproof. If anything, the "weak link" in the chain is shift pin; since it's fixed (non-rotating) there's a chance of flat-spotting...which could cause problems. Consider, the floating pins are sometimes found worn and so evenly that you'd never realize they weren't machined with stepped-diameters...unless you've seen them new. If the throttle sticks, then all bets are off. None of these transmissions will shift normally under load, even a partial load, and without coordinating throttle application. Good idea to clean & lube the entire throttle operating assembly. Check cable action while you're at it; they can become arthritic over time. Might not hurt to either replace the return spring with a stiffer one, or give this one a gentle stretch. If the slide is binding inside the carb body, the high spots can be identified with Dykem, or black marker pen...then polished. Removing material from the slide is not a great idea but, a sticking throttle is worse. [/QUOTE]
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S 90 grinding into 2nd gear
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