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General Minitrail Talk
Tech Area
S 90 grinding into 2nd gear
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<blockquote data-quote="69ST" data-source="post: 181778" data-attributes="member: 5"><p>Isolate the sticking point. With CT70s, it's usually the vinyl grip cover...at least with the new OER. If the S90 uses the same throttle assembly, then we can offer some suggestions on how to free it up. When these bikes were new (first Honda I rode was a nearly-new S90) throttle return action was usually pretty good. </p><p></p><p>Funny thing about these internal twist grip throttle assemblies, they tend to improve with use. The helix & slide get smoother and the manufacturing quality was better 50 years ago. From what I've seen, it's mostly a matter of getting the 'throttle pipe" to move freely, with the smaller issue being the slide that holds the cable end. After cleaning out all of the old, sticky, grease, you want to use a thin grease, such as Lubriplate. It's, essentially, lightweight lithium grease, so the brand name doesn't make much difference. I've tried using bearing grease and, it's too thick. </p><p></p><p>All of the metal parts should be nicely broken-in, to each other. Clearances should be bigger than they were when new. So, unless there's rust inside, solvent cleaning, new grease (thin viscosity/high film strength) should work wonders. The only piece that may be fatigued is the return spring.</p></blockquote><p></p>
[QUOTE="69ST, post: 181778, member: 5"] Isolate the sticking point. With CT70s, it's usually the vinyl grip cover...at least with the new OER. If the S90 uses the same throttle assembly, then we can offer some suggestions on how to free it up. When these bikes were new (first Honda I rode was a nearly-new S90) throttle return action was usually pretty good. Funny thing about these internal twist grip throttle assemblies, they tend to improve with use. The helix & slide get smoother and the manufacturing quality was better 50 years ago. From what I've seen, it's mostly a matter of getting the 'throttle pipe" to move freely, with the smaller issue being the slide that holds the cable end. After cleaning out all of the old, sticky, grease, you want to use a thin grease, such as Lubriplate. It's, essentially, lightweight lithium grease, so the brand name doesn't make much difference. I've tried using bearing grease and, it's too thick. All of the metal parts should be nicely broken-in, to each other. Clearances should be bigger than they were when new. So, unless there's rust inside, solvent cleaning, new grease (thin viscosity/high film strength) should work wonders. The only piece that may be fatigued is the return spring. [/QUOTE]
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General Minitrail Talk
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S 90 grinding into 2nd gear
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