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Done Everything, Still Has Hanging Idle
- Patton
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Typical bench sync involves using a small drill bit or paperclip wire, etc. to assure equal heights. But some of us simply eyeball them. As the heights will be readjusted anyhow during final sync.
As earlier noted, final sync usually entails gradually lowering the idle with the thumbscrew (which simultaneously lowers all slides). Which requires sufficient adjustment room on the threaded portion of the idle thumbscrew. Hence the importance of having the thumbscrew at mid-way thread position during bench sync. Thereby enabling the successively lower idle positions typically needed during final syncing and fine tuning.
Please forgive some repetitiveness, as am trying to better explain.
Good Luck!
1973 Z1
KZ900 LTD
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- anarki650
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Bench sync is fixing all slides at physically equal heights, as starting point for later actual sync (with engine running) wherein final adjusted heights will slightly differ to best equate performance of cylinders at lower rpm.
Typical bench sync involves using a small drill bit or paperclip wire, etc. to assure equal heights. But some of us simply eyeball them. As the heights will be readjusted anyhow during final sync.
As earlier noted, final sync requires ability to further lower (or sometimes raise) the slides. Which requires sufficient adjustment room on the threaded portion of the idle thumbscrew. Hence the importance of having the thumbscrew at mid-way thread position during bench sync. Thereby enabling lower and lower idle positions typically needed during final syncing and fine tuning.
Please forgive some repetitiveness, as am trying to better explain.
Good Luck!
Awesome info Patton (as usual)!!!! I've got to admit, after the several carb rebuilds I've done, and feeling like I pretty well know my way around the vm series carbs I'd never thought of setting the thumb screw in like that when bench syncing. I've always been lucky that bench syncing with the thumb screw out has worked for me but I'll definitely be taking that step next time I have the carbs off and apart. Thanks!!!
09 Kawasaki ER6n
77 kz650b1 cafe rebirth project
"Being shot out of a cannon will always be better than being squeezed out of a tube, that's why God made fast motorcycles..."
Dr. Hunter S. Thompson
Omaha NE
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- TeK9iNe
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- What did you do!?!
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If you do need to change things later, the rtv just pops out, no mess, real easy. :huh:
GL...
Seriously though...
Air can leak in via many strange places on carbs, (like throught the throttle butterfly shaft passsages).
From air box snorkel tip, to the end tip of the exhaust pipe, needs to be completely air tight.
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- tinlizzie37
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Bob KZ 650 E1, En 450
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- polkat
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First I tried a somewhat stronger return spring, but my hand felt it when the miles added up.
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- redwood
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- 81 650 CSR
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- otakar
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74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- Kawboy74
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1974 Z1A As original as I could get it
'88 ZX750R braided lines, mostly original
KZ1000 project on the bench
Burlington,Ontario,Canada
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- gane
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[img][/img] 1977 KZ1000A1
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- redwood
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- 81 650 CSR
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- Russ Jackson
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1976 KZ 900 B1 29 smoothbores, Kerker, Lester Mags
2008 Kawasaki Concours 14 abs
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- Patton
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Any ingestion of propane through an air leak should noticeably affect engine performance. Same idea as with the other type spray mediums.
The propane may offer better coverage than spritzing around with WD40 or carb cleaner or ether or moisture or whatever.
Good Fortune!
1973 Z1
KZ900 LTD
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