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-   -   WHOOOOAAA outta sync carbs (http://forums.sv650.org/showthread.php?t=75875)

Torn-Thorax 07-08-06 07:18 PM

WHOOOOAAA outta sync carbs
 
(I found the loose wire preventing my bike from starting, thanks everyone by the way)

So I am in the middle of the carb sync. And it my carb tool told me my carbs were way off, and that was what i expected. However they appear so far off that even with the butterfly adjust screw all the way in, they are still just a little bit off at idle. When i rev it up to 3000rpm the reader says the carbs are dead on. Is it bad that my screw is all the way in?

TSM 07-08-06 07:31 PM

Its possable that you have an air leak, check that the carbs are fitted correctly and that they are correctly secured.

andyauger 07-08-06 08:11 PM

Always synch off idle
 
You should always have the bike off idle when you try to synch. The dead closed position response varies from carb to carb. 2K to 3K RPM is a good synch point.

Blue_SV650S 07-08-06 08:15 PM

Re: WHOOOOAAA outta sync carbs
 
Quote:

Originally Posted by Torn-Thorax
(I found the loose wire preventing my bike from starting, thanks everyone by the way)

So I am in the middle of the carb sync. And it my carb tool told me my carbs were way off, and that was what i expected. However they appear so far off that even with the butterfly adjust screw all the way in, they are still just a little bit off at idle. When i rev it up to 3000rpm the reader says the carbs are dead on. Is it bad that my screw is all the way in?

As TSM said, check for leaks/seals. If this checks out then it might be worn valve seats that are causing the lack of vacuum at low RPM, try a compression test, or better still a ‘leak down’ test 8)

Sid Squid 07-08-06 08:19 PM

When balancing run the engine at the slowest speed at which the gauges will give a stable reading, on an SV this shouldn't need to exceed 1800-2000rpm, but of course depends on your gauges as well, the slower you balance the more accurate it will be.
There is no benefit whatsoever in the fallacy that you should balance at some sort of running speed, the throttle position at, say 5000 rpm, on the stand is enormously different from that at which it will be under even the smallest load when riding.

svrash 07-08-06 08:39 PM

I had this problem when i synced mine, i traced it to the bar that moves the rear carb butterfly via the front (its on the left of the carb)

There was some play in the brass washers which made syncing a nightmare, i replaced the bar, butterflys and the bit where the cables attach and no probs again (til next time :roll: )

Torn-Thorax 07-08-06 10:09 PM

What is the drip leak test?

Torn-Thorax 08-08-06 02:07 AM

OK. I checked all around the carbs for loose, wrotting, or otherwise leaky tubes. I also checked for any loose parts on the carburetor. The bike seems to run much better now, it doesnt stall out at low RPMs. I just am still a bit concerned about the butterfly screw being all the way in


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