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cv34 sync question. What is actually adjusted?
- kzbobber1
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- taildragger1197
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Union City, Tennessee
1979 KZ1000 LTD B3
1979 KZ1000(1260)LTD S/G Pro ET
1993 ZX11 D1 Ninja
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- chrispysaki
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I never bench synced mine, but I vacuum synced them while running by using a homemade manometer consisting of a clear tube attached to a wooden dowel and some 10w oil. YouTube has a bunch of videos on making and using these things. I made mine for under $5 and my bike is running great throughout the range and all spark plugs look identical.
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- Becker
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- The Doctor Will Rise Again
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When you are bench syncing you are just setting the carbs so that each one has the same amount of opening. Its a great place to start but you still need to bench sync them once they are on the bike if you want it to run really nice.
To sync the carbs you have to know what kind of carbs you have. If they are VM then there is a screw and lock nut on top of each slide, under the cap. You can lift each slide individually using this setscrew. Lifting or lowering each individually will change how much vacuum it will pull.
If you have CVK or BS type carbs then you will use the three set screws one between each set of carbs. in this case the screw closes one carb and opens its partner at the same time. The order in which you should adjust the screws is:
1-2 screw
Blip throttle and then adjust idle speed.
3-4 screw
Blip throttle and adjust idle speed.
2-3 screw
Blip throttle and adjust idle speed.
Sorry if this is all very patronizing but I thought it would help to break it down just to see if I could remember it all and just in case anyone had questions they didn't want to ask. Good luck and have fun.
78 KZ750B3
79 KZ400 LTD
78 KZ650C2
79 KZ650C3
78 KZ650B2A
80 KZ650F1
80 KZ650E1
81 CB750K Super Sport
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- kzbobber1
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- Patton
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so what am I looking at? what will be moving up and down? is it the butterfly on the engine side of the carb or is it the brass colored slide in the middle of the carb. if I open the choke up all the way to look through the carbs and oven up the throttle all the way the slides are all up like half an inch and I can see a tube that looks like it goes up in the middle of it. Is this what I am adjusting? If so it sounds like they are open way too far. If it is the throttle butterflies that I am adjusting, cant I just do that with the main plastic screw adjuster in the middle of the 2 and 3 carbs. Sorry for all the dumb questions but I just want to make sure they are adjusted correctly. Thanks for all your help. If anyone has any pics that would help me out. I have Kehin CV34's by the way.
I don't have at hand a link for comprehensive info and pics directed specifically at Kehin CV34 carbs, or any Kehin CV carbs.
However, many CV carb principles are the same, regardless of bike brand or carb brand.
Check out these links for some helpful info and pics about what goes on inside CV carbs:
www.drpiston.com/Cvcarbs.html
www.thegsresources.com/gs_carbrebuild.htm
Good Fortune!
1973 Z1
KZ900 LTD
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- Patton
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Link to Japanese carb section
www.dansmc.com/carbs/Japanese_Carbs/Carb_pics.htm
from Dan's Motorcycle Repair Course
www.dansmc.com/mc_repaircourse.htm
Good Fortune!
1973 Z1
KZ900 LTD
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- Patton
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1973 Z1
KZ900 LTD
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- kzbobber1
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- kzbobber1
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