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General Minitrail Talk
Modifications
1971 ct.70 - throttle assembly too tight - best modification to fix "no spring back"
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<blockquote data-quote="69ST" data-source="post: 84466" data-attributes="member: 5"><p>Return spring action was never very positive, hence the term "CT70 cruise control" :40:. They usually work better while the engine is running, still not truly up-to-snuff. A heavier throttle return spring, at the carb end, does help but there's only so much that can be done with a small diameter spring. A helper spring, at the handlebar end is a sound idea.</p><p></p><p>That said, throttle cables do become arthritic, for various reasons. Some are non-correctable. I lean toward replacement, nothing like a free-sliding, minty-new, throttle cable. On the other hand, the internal twist grip assembly mostly improves with use, only accumulating dirt/grease paste will gum-up the works. The slide/internal helix (inside the throttle pipe) were manufactured better, decades ago; they also break-in.</p><p></p><p>Lastly, the vinyl outer grip cover, at least new OEM replacements, tend to bind at both ends. If you replace yours, make sure you don't press it too far inboard. And, it will probably be necessary to trim the inner lip at the LH end.</p></blockquote><p></p>
[QUOTE="69ST, post: 84466, member: 5"] Return spring action was never very positive, hence the term "CT70 cruise control" :40:. They usually work better while the engine is running, still not truly up-to-snuff. A heavier throttle return spring, at the carb end, does help but there's only so much that can be done with a small diameter spring. A helper spring, at the handlebar end is a sound idea. That said, throttle cables do become arthritic, for various reasons. Some are non-correctable. I lean toward replacement, nothing like a free-sliding, minty-new, throttle cable. On the other hand, the internal twist grip assembly mostly improves with use, only accumulating dirt/grease paste will gum-up the works. The slide/internal helix (inside the throttle pipe) were manufactured better, decades ago; they also break-in. Lastly, the vinyl outer grip cover, at least new OEM replacements, tend to bind at both ends. If you replace yours, make sure you don't press it too far inboard. And, it will probably be necessary to trim the inner lip at the LH end. [/QUOTE]
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General Minitrail Talk
Modifications
1971 ct.70 - throttle assembly too tight - best modification to fix "no spring back"
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