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carb sync
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dant123
New User
| Posts: 1
| Joined: 11/09
Posted: 11/24/09
07:50 PM
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just picked up a shadow 1100 1998. carbs supposedly were rebuilt but not synced. i heard of a way to sink these carbs with a vacuum gang valve from a fish tank. is this possible? if not how would i do this? im a mechanic on cars but not on bikes.
any answers form any of you bikers out there?
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Posted: 12/08/09
10:14 AM
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Search "Manometer." This is a mercury filled bowl with 4 tubes submerged into the liquid. You have a small limiting hole so the merc does not run into the engine intake pulse, but the mercury is sucked up the tube and remains stable.
You install 2 of the 4 tubes for a twin cylinder, naturally; so you can turn the linkage screw in the middle of the carb bodies. You balance the two levels of merc that are being pulled up by the uneven intake strokes.
Blip the throttle a few times before you remove the carb sync tool. If the levels remain stable and level with a warm running engine, you are done with the sync.
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GrufRude
New User
| Posts: 3
| Joined: 12/09
Posted: 12/09/09
01:36 PM
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Just joined this forum, so I'm sure you've probably solved this problem long-ago. If not, I posted a fairly in-depth article on how to build and use a carb synchonizer for $4 many years ago. The article is at:
http://www.airheads.org/content/view/183/98/
Maybe this will help.
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Posted: 01/24/10
07:48 PM
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Hello dant123:
The simplest and most accurate method of syncing carbs is by using your own ear. Stick a piece of tubing into your ear, place the other end near the air inlet of one carb. The air rushing into the carb will make a steady sound. Then move the end of the tubing to the inlet of the next carb and compare it's sound with the first carb. Adjust the butterfly of one carb till the sound of each carb is exactly the same.
There is no easier, cheaper, or more accurate method of syncing carbs. It's just like tuning two guitar strings to the same pitch.
Woody
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joegresh
User
| Posts: 127
| Joined: 03/09
Posted: 01/30/10
07:15 PM
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Haywoody,
Tried your carb sync method. Having a little trouble hearing so you'll have to shout.
The sync went well except that now the pilot air jet of my carb is clogged with earwax. Stumbles bad off idle. Going to try a shot of earclear in the gas to cut it. What? Say again! Eh?
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