I went to sync my carbs on my 77 GS750, but I found carb 3 to also be adjustable. I adjusted the carbs to each other, but shouldn't carb 3 not be adjustable? I also had issues with a high idle after my adjustments. To the point where I'm almost out of idle adjustment nob threads. I got it to idle at 1,200 eventually. Am I doing something wrong?
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Nope BS carbs have Blogs as reference
Your VM carbs have no reference carb
High idle generally comes from adjusting the sync too high
1978 GS 1000 (since new)
1979 GS 1000 (The Fridge, superbike replica project)
1978 GS 1000 (parts)
1981 GS 850 (anyone want a project?)
1981 GPZ 550 (backroad screamer)
1970 450 Mk IIID (THUMP!)
2007 DRz 400S
1999 ATK 490ES
1994 DR 350SES -
As mentioned. no reference carb on VM's.
Reset the adjusting screw under each carb top to mid way on the threads and sync..
Idle should be closer to 1000 rpm.Mikuni Viton Choke Plunger Seat Renewal.
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Air Corrector Jets for Mikuni VM 24, 26 and 28mm carbs .
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A high idle can also be from vacuum leaks, typically from the carb boots that attach to the engine.Ed
To measure is to know.
Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182
Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846
Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf
KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-ResurrectionComment
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I went back and did it again, got 1,2, and 4 dead on matching. 3 is a little off, but it's so close I'm gonna call it good enough.Comment
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I went back after doing some more reading. My problem was a didn't block off the vacuum line to the petcock. That was causing the vacuum leak. Once I plugged that, I got my idle and my sync all set.Comment
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