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Can you Synchronizing CV Carbs to Cyl. Compression reading ??

  • Thread starter Thread starter pac315
  • Start date Start date
P

pac315

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I just finished rebuilding a 1980 GS750L. After having the head trued (it was warped so the machine shop took off about 0.024in. - mostly from the outside parts of the head) I put the engine back together using two head gaskets. I did a compression test, which was rather low and I noticed the two center cylinders were 20 lbs lower that the outside two cyls., i.e., 110, 90, 90, 110. The bike starts fine, and runs very well over 4,000 RPM. But, it seems rough from 1,500 to 4,000. Plugs look normal, bike idles fairly well, acceleration is fairly quick and smooth, top RPM obtainable in 1st & 2nd gear, compression does not drop with time so I feel rings and valves are OK. Maybe I am being picky, but I want the bike to be smooth at all RPM ranges, especially during the low to mid range.

So ? my question: what should I try first from the list below and in what order (or do you have another suggestion not given)?

1) Should I be worried about the low compression reading and the difference between the cyls. or the fact that so much was removed from the head (it is over the recommended amount of 0.009in.) and install another head?
2) Should I remove one head gasket in an attempt to get the compression up and see what that does?
3) Should I synchronize the two center carbs with a little more vacuum gauge reading since the cylinders are not ?pulling? as much compared to the two outside cylinders? Has anyone ever synched carbs relative to their respective compression reading?
4) Should I raise the jet needle slightly more on the two center carbs (giving them a bit more gas at mid RPM)?
5) Should I even give a crap and just ride the hell out of the bike for the next 20,000 miles?

Thanks for your opinions. I know just enough about ?mechanen? to get into trouble, but not enough to get out!

Paul C.
 
With new spark plugs installed ride a couple miles down the highway at 1500 RPMs kill the engine, pull in the clutch and coast to a stop, pull the plugs and see what color they are and if they are wet or dry. Then report back.

I'm having the same hesitation problem in the same RPM range and have yet to figure it out.
 
WHY did you use two head gaskets ???
Or did you mean base gaskets ???
 
I used two head gaskets because the local Suzuki mechanic said I should because so much was removed from the head when I had it shaved & trued. However, I wish I had measured to see if there was enough clearance with some clay over the piston. Hind sight is definitely 20/20! Note: I am looking for a new head that is not too bad or worse than the one I have. Know where I can get one?

Later,

PAC
 
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