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90PSI warm on all 4 cylinders, no valve clearance at all

  • Thread starter Thread starter lemonshindig
  • Start date Start date
Well, there's one valve in which I measured .003-.004" clearance with a 2.65mm shim, formerly had a 2.75 installed with less than 0.001". I installed a 2.70mm shim, and now I'm still less than .001" clearance. I had 5 other valves measure the exact same way, and all of them are showing 0.003" with the new 2.70mm shim, so either that one new shim is really closer to 2.75, or it isn't fully seated. I don't have a mic handy, but I'll run it for a bit then check the clearance again. I might swap that 2.70 for a different one and see what happens.

Still waiting on one last shim, can't run it until i get that and bolt it all back up, but i did a cold compression check on cylinder #1, came up with 140psi. Hot damn!
 
If you installed a 2.70 in place of a 2.75 and still don't have enough clearance, try a 2.65.

Hopefully it does not need anything smaller than that, but only because that would mean possible problems due to burning valves.

.
 
Well, got all the valves adjusted (Thanks GS Shim Club!), it was looking promising, .002"-.004" on all 8 valves. Also reset the points, one was at 5 thousandths instead of 14.

Went for a ride, WOOOOOOOOOAH. It was FAR more powerful than before. After heating up a bit, though, it started missing. Not as bad as it had before, but it was missing. I could possible chalk this up to carbs needing adjustment and sync.

But I pulled up back home and ran a compression check, 85-90 psi on all four. One of my compression testers would run up to 90 and then start draining back down, the other read 85-90 and stayed there until i let the pressure out of the line. I tend to believe the second one, I think my first tester has a leak.

Anyhow, I still have bad compression. About the only thing I can think of is to check the valves again. Maybe the valves and seats were covered in carbon deposit, and a quick run cleared it out and now my valves are all tight again? Far-fetched, but it's all I've got before deciding my engine is toast.

:(
 
lemonshindig said:
Anyhow, I still have bad compression. About the only thing I can think of is to check the valves again. Maybe the valves and seats were covered in carbon deposit, and a quick run cleared it out and now my valves are all tight again? Far-fetched, but it's all I've got before deciding my engine is toast.

:(
Click to expand...

Could be this, could be the rings are a bit stuck still.

Recheck the valve clearances and ride it a thousand miles or so before deciding anything is toast. After that check the compression again. You did open the throttle during the test, yes?
 
tkent02 said:
Could be this, could be the rings are a bit stuck still.

Recheck the valve clearances and ride it a thousand miles or so before deciding anything is toast. After that check the compression again. You did open the throttle during the test, yes?
Click to expand...

...no...

Hold for a second set of numbers...
 
145-150 all the way across. I can settle for that.

Good indication that the 12k on the odometer is a real 12k?
 
Congrats, you fixed it. Well, at 112,000 the compression could be exactly the same. My old 550 was that tight at 120,000 miles.

Look at other things, footpeg pivots, footpeg rubber, shifter rubber, paint rubbed off the frame from boot heels, pits on the leading edges of everything, chips in the paint under the frame, a uniform layer of black crap underneath the bike. Loose levers and things, just overall wear and tear. People can replace all these things, but they almost never do so if this stuff looks like a low miles bike it probably is.
 
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