Possible carb issue??? - Steve Saunders Goldwing Forums

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post #1 of 29 (permalink) Old 07-01-2019, 12:28 PM Thread Starter
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Possible carb issue???

Ive always had a thing for old Hondas, Ive had a couple cb 550s and 750s all from the late 70s. I recently got my hands on a mint 78 Gl 1000 with 58K. Biker runs and cruses great but has a couple gremlins in it Im trying to chase down. after i got the bike i noticed its idle was a little rough and high and the bike had a shake to it and I could hear the primary chain making noise, I got a sync kit and synced the carbs and all that went away, although now it appears i made another problem, now when returning to idle the RPMs will dip below idle speed and kick back up, also if i rev the bike slowly it will stutter for a split second around 3K and kick back up. adjusting the idle mix screws had no effect and i double checked the carbs and they are staying in sync, the bike is riding fine and a mix of city and highway driving I get around 38 mpg ( would be better but im not that easy on the throttle) any help or advice would be most welcome!
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post #2 of 29 (permalink) Old 07-01-2019, 03:19 PM
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Suspect carb issue,if the carbs arenít clean then the sync will be off,put some injector cleaner,Seafoam,RXP from auto zone and run it kinda hard for a tank and see if it runs different.

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post #3 of 29 (permalink) Old 07-01-2019, 04:32 PM
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A sync is not a cure or fix for an improperly running engine, it is the icing on the cake and is done lastly when all else is in proper operation and tune. Start with the basics, a compression test is always advisable along with plug wire and spark quality available to the plugs, ignition timing and valve lash check/adjustment.

Then it is on to carbureation checking which cylinders are running rich, lean or correctly.

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post #4 of 29 (permalink) Old 07-01-2019, 05:28 PM Thread Starter
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Valve clearance and timing is all good, compression is 152 to 155 cold on all cylinders, I was told it could be running rich or it has a vacuum leak, adjusting the idle mixture pilots rich or lean makes no real difference, only it runs worse when I turn them in, right now they are all set 2 1/2 turns out per the book
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post #5 of 29 (permalink) Old 07-01-2019, 05:51 PM
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I think you have an air jet plugged causing the stumble at 3K and possibly the air cut off valve has been blocked off causing the drop below idle. And fuel treatments won't cure either.

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post #6 of 29 (permalink) Old 07-01-2019, 07:17 PM Thread Starter
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Thanks I'll check that out. If it looks like the carbs could need a rebuild, I might just wait until it's starts getting cold out and have a pro do it, it runs well enough so I just want to ride while I can
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post #7 of 29 (permalink) Old 07-02-2019, 12:23 PM
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If it gets 38 mpg it can't be running too bad. Run a can of Seafoam through it and start shopping for a carb rebuild kit and OEM float valves.

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post #8 of 29 (permalink) Old 07-02-2019, 07:36 PM Thread Starter
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Is there a kit that comes with float valves? What's the best kit for the money?
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post #9 of 29 (permalink) Old 07-02-2019, 07:42 PM
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There is only 1 good kit I know of other than spending twice the money for Honda parts, https://www.randakks.com/randakks-ow...rhaul-kit.html & it doesn't come with the float valves. He recommends only OEM Honda for those.

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post #10 of 29 (permalink) Old 07-02-2019, 09:10 PM
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Do you need the float valve, or the float needle?

http://power-barn.com/keihin-float-n...m-carburetors/

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