Author Topic: What is this screw for on the throttle linkage (Read 369 times)

JDrider · « **on:** August 17, 2023, 04:47:19 PM »

1975 cb550k1
Can’t figure out what this screw and spring is for on my carbs

Gurp · « **Reply #1 on:** August 17, 2023, 10:15:18 PM »

Idle speed adjustment

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bryanj · « **Reply #2 on:** August 17, 2023, 11:45:27 PM »

Idle speed is the big one on the end

dave500 · « **Reply #3 on:** August 17, 2023, 11:51:37 PM »

that screw sets the max opening,the idle speed is easy to adjust underneath with this thumb screw.

Little_Phil · « **Reply #4 on:** August 18, 2023, 01:57:26 AM »

Only seen that extra spring on the throttle shaft on Pd carbs. Is it helping with opening or closing?

dave500 · « **Reply #5 on:** August 18, 2023, 02:17:27 AM »

neither,it keeps tension on the screw to hold it where its set,the screw sets the max throttle opening.

Little_Phil · « **Reply #6 on:** August 18, 2023, 04:44:13 AM »

Yes just looked it's normal. But is the screw just the maximum open stop screw.

JDrider · « **Reply #7 on:** August 18, 2023, 05:00:40 AM »

the screw isnt attached to anything to adjust. Its just a screw with a spring. Or am I missing something?

denward17 · « **Reply #8 on:** August 18, 2023, 05:07:11 AM »

Does it have anything to do with the choke and fast idle?

Do you have a cable pull for the choke on this model?

JDrider · « **Reply #9 on:** August 18, 2023, 05:36:39 AM »

no cable pull for choke on this model.

JDrider · « **Reply #10 on:** August 18, 2023, 05:47:12 AM »

So looking at other videos, it is to keep the throttle pull limited.
the screw sets the max throttle opening like Dave 500 said.

dave500 · « **Reply #11 on:** August 18, 2023, 01:55:08 PM »

watch what it does as you crank the throttle open.

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