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79 gs850 popping

  • Thread starter Thread starter Chuck Fryer
  • Start date Start date
For GS valves, lose is good. That means they are closing. If you can't find a gap then they are still open.

When GS valves wear, the gap closes. So the tighter they are, the more worn they are. Keep on the side of a bigger gap to ensure they are closed correctly and you have built in some capacity for wear.

I have found that bench synching is no substitute for the real thing. When those cylinders are sucking in the air, that's when you need to check the synching.

Greetings
 
So, about the jetting....
I've read they were lean from the get go. What should I change, main? Pilot? Just one size bigger?
 
Hi Chuck,

Here is another data point:
1979 GS850G with Vance&Hines 4 into 1, and K&N filter inside the stock air box. I started with moving the main jet up one size to 105 (from stock 102.5) but it still wasn't pulling like my first 850G.

Next was going up one more size to 107.5's - better but not great.

Last adjustment was moving the needle clip down one notch (to the middle slot) and my bike was running perfectly.

Rob
 
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Problem found! Even though I felt as though I did a thorough job cleaning the carburetors, I found that somewhere in the idle circuit of number 3 there was a clog. The funny thing is I found it when I was looking for an exhaust leak. I was holding my hands real close around the pipes at the head trying to feel for an exhaust leak and noticed that number 3 pipe was cold the other three were hot. Just thought I would add that in case somebody else ran across this thread trying to troubleshoot a similar issue.
 
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