return throttle spring
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,700
Likes: 25
From: Sorrento Italy
return throttle spring
I have a perfect iddle settled to 800/850 rpms but when releasing the pedal it keeps for sometime at around 1.200/1.300 rpms, i've checked the carb and i've seen the throttle cable does not go back fully and pushing back manually the throttle cable the iddle sets to its original rev level...
My opinion, and actually it's the only reason i could see, is that the return spring of my mighty carb is worn out or loose...what's yours?
My opinion, and actually it's the only reason i could see, is that the return spring of my mighty carb is worn out or loose...what's yours?
Pro
Joined: Apr 2005
Posts: 618
Likes: 0
I have a similar problem and posted on it recently. If your throttle plate shaft bushing is worn out, it will stick just enough, where the throttle won't return to idle on its own.
I thought the same thing: that the spring was worn out, but it's the shaft bushing. Contact Lars for help.
I thought the same thing: that the spring was worn out, but it's the shaft bushing. Contact Lars for help.
Thread Starter
Team Owner
Joined: Nov 2004
Posts: 20,700
Likes: 25
From: Sorrento Italy
[QUOTE=AirTrafficController;1562547807]I have a similar problem and posted on it recently. If your throttle plate shaft bushing is worn out, it will stick just enough, where the throttle won't return to idle on its own.
very helpful, thanks
very helpful, thanks
Le Mans Master
Joined: Apr 2000
Posts: 5,202
Likes: 10
From: cincinnati ohio
St. Jude Donor '09
I'm chasing the same type problem with Speed Demons on my blower application. Idle setting would not return that last 100-200 rpm or so. These carbs are new so no worn parts.
My only solution so far is to use return springs a little stiffer than I would like.......
My only solution so far is to use return springs a little stiffer than I would like.......
Former Vendor
Joined: Oct 2007
Posts: 2,092
Likes: 2
From: walpole ma
Go to a heavier spring
Tech Contributor
Joined: Aug 1999
Posts: 14,356
Likes: 6,332
From: At my Bar drinking and wrenching in Lafayette Colorado
Before going to a heavier spring, which is usually not a good solution, try re-positioning the spring. Rather than having the spring pull backwards from the bottom of the throttle lever, attach the spring to the top of the lever and have it pull forward (to a bracket or clip mounted to one of the forward manifold bolts). This will usually solve the return problem, provided you do not have a rpoblkem with the cable itself.
