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Plug Issue and Miss Issue
- BIGKEVIN
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1976 KZ900
2006 ZX6R
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- Patton
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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May perform clear tube test on the bench with carbs held level.
May use rubbing alcohol or odorless mineral spirits where gasoline odor is an issue.
Usually only one float bowl screw is needed during the process of achieving the correct tang adjustment.
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1973 Z1
KZ900 LTD
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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If not already done before syncing with engine running, would assure perfect functioning of the timing advancer, and visually observe spark quality (looking for fat blue sparks), and assure valve clearances are within specs, and assure correct uniform fuel levels via the clear tube test.
The procedure of adjusting the float height to conform with some measured distance while the carbs are upside down on the workbench, may or may not happen to come close to the correct height necessary to provide the correct fuel level. The fuel level is critical. When the fuel levels are correct in all carbs, it's likely that the measured float heights will vary among the carbs.
Carb performance depends on proper functioning of the other components, and even a perfect carb can't compensate for deficiencies in the other components.
Attempting to sync without first attending to all the other items upon which carb performance depends, is usually an exercise in futility.
Sometimes the clear tube test doesn't require any type of special tool, fitting, barb, or whatever; and the end of the tube itself may be snugly fitted inside the drain hole. Minimal leakage where the tube connects to the float bowl drain won't adversely affect the test results.
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1973 Z1
KZ900 LTD
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Click > www.kzrider.com/filebase/doc_download/43...asaki-service-manual
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1973 Z1
KZ900 LTD
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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BIGKEVIN wrote: I did the clear tube test because the #1 carb was leaking a little bit of fuel overnight. The bike was running pretty good before I tried to sync the carb with the pro-motion carb tool. I will check the carbs again tomorrow and try bench sync and so on afterwards.
As noted, running sync is the final step in a tuning journey.
Prerequisites for proper running sync include proper functioning and settings of other components such as float valve, float, fuel level (as verified by the clear tube test), etc.
Result of clear tube test will be invalid if carb is discharging fuel through the overflow circuit (a) when the fuel level is already way too high, which is often due to a malfunctioning float valve or float mechanism, or (b) too low, due perhaps to a cracked overflow tube.
Sync effort is likely futile on a carb with a leaking float valve.
Sync effort is inaccurate on carb with incorrect fuel level.
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1973 Z1
KZ900 LTD
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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BIGKEVIN wrote: I corrected the problem with the fuel flowing out of the overflow tube. Somehow I got the tab on the #2 float bent up so far that it was not making contact with anything, so the fuel would just keep running into the carb. After getting issue fixed, I tried syncing the carbs and now the bike just idles real high, so high that I have the idle screw backed out all the way to where it is not touching anything. I plan on pulling the carbs back off again tomorrow.
The bench sync leaves throttle slides at equal heights.
As often happens, the later running sync requires lower throttle slide heights achieved by further turning out the idle adjustment screw, which entails having sufficient thread remaining on the idle adjustment screw.
When bench syncing, remember to allow sufficient threads on the thumb idle screw to permit further lowering the slides when later performing the engine running sync.
Failure to do so is probably what caused: now the bike just idles real high, so high that I have the idle screw backed out all the way to where it is not touching anything.
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1973 Z1
KZ900 LTD
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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