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TOPIC: Throttle Hanging Open (Adjustment help requested)

Throttle Hanging Open (Adjustment help requested) 6 months 3 weeks ago #23134

  • propav8r
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Hi all, small issue on my '79. When I open the throttle and release it to close, the throttle doesn't close all the way. I have to remember to twist the throttle closed manually, or else the bike idles at 3000-4000rpm, and brakes poorly because it's still trying to accelerate.

Dangerous and unnerving.

So I pulled the tank off tonight and believe I've found the problem. When the throttle closes, the little roller (I'm gonna call it the "choke roller" for lack of a better term), shown by #1 in the photo below, comes into contact with it's stop before the actual throttle stop (#2) can contact at the back.

The throttle can be easily manually closed past this point, but I shouldn't have to do that.

Could anyone direct me to information on adjusting this? I can't seem to find anything, and there's no apparent adjustment for the choke roller.

Thanks!

Edit// disregard the "helper" return spring and the loose balance adjustment nuts. I added the spring to see if it helped (it doesn't) and was rechecking my carb balance.

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Last edit: by propav8r.

Throttle Hanging Open (Adjustment help requested) 6 months 3 weeks ago #23135

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Slide the choke-roller cam out of the way and see if the idle returns to normal. I'll elaborate based on the answer. It's likely due to some assembly errors/ misalignments which are easy to miss.
1980 KZ 1300 sr# KZT30A-009997
Always High - Know Fear !
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Throttle Hanging Open (Adjustment help requested) 6 months 3 weeks ago #23137

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scotch wrote: Slide the choke-roller cam out of the way and see if the idle returns to normal. I'll elaborate based on the answer. It's likely due to some assembly errors/ misalignments which are easy to miss.


Yes, with that cam out of the way, the throttle closes as it should. If I so much as loosen the set screw for that cam by 1/8 turn, the throttle works as it should.

I didn't split the carbs off the rack when I cleaned them. Maybe I was hamfisted and bent something?

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Throttle Hanging Open (Adjustment help requested) 6 months 3 weeks ago #23139

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I'm looking at the choke cam and the profile doesn't look right. It appears to be teepee'd. Scotch?

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Throttle Hanging Open (Adjustment help requested) 6 months 3 weeks ago #23140

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Here's a better photo of the choke cam

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Throttle Hanging Open (Adjustment help requested) 6 months 3 weeks ago #23141

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Better pic. Thankyou. I'll leave this For Scotch to advise. He's our carb guru.

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Last edit: by Kawboy.
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