Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: TrickyMicky on July 26, 2025, 05:09:34 PM
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Greetings people, I am just wondering if anyone has managed to fit a throttle return spring of less strength. I have reached the age now where when riding round twisty lanes that need constant speed changes, my poor old right wrist is starting to give me hell. NO! it's totally unconnected with any nocturnal naughties!!! Considering that it is fitted with a push-pull cable set up, I cannot see the need for such a strong spring. I tried one of those 'paddle' gizmos thatb sit under the heel of the thumb, but when pretending to be Hailwood, plenty of front brake and blipping the throttle as you change down it got in the way and was quickly sent on its way to the back of the garage.
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I'm also interested. I tried to find a suitable spring when I was rebuilding the carbs but no luck. As noted, it definitely does not need to be so stiff. I also have tried one of the paddle thingies but I wasn't as considerate as you...I threw mine in the rubbish bin!
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Heaven forbid but if the bike is lying on its side with you stuck under it, it's reassuring to know that the bike can close the throttle all by itself.
If I was going to mess about with that I would probably try a washer hooked on the spigot where the spring goes and drill a small hole in the washer to reattach the spring, should reduce the tension a bit. A small chain link might be another option to take a few mm off the spring tension.
Regards
Dave
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"Heaven forbid but if the bike is lying on its side with you stuck under it, it's reassuring to know that the bike can close the throttle all by itself."
And that's probably why it's designed that way! I like your idea re a washer/chain link, etc. Might try that next time I have the carbs off though I'm hoping I'll have no reason to remove them for years! :)
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If the 400 is similar to the 500/550 then even when the slides are fully down there is still a lot of force and the spring is quite stretched. So similar to what's written above I used a small keyring type loop at the top end to reduce the stretch. Just make sure it still closes securely, mine does.