#4 cyl.only 30 lbs. compression

[azr]

Did you try smacking the carb?

[slyone]

Did you try smacking the carb?

of course LOL I'll try anything. I saw you were having issues with your bike back in June that kinda sound like mine a little? In the ign.thread you never said what fixed it? I was actually just looking at prolly pickin up new plugs and caps from Z1. Can't hurt (I don't think..) and relatively inexpensive too.

[azr]

I never actually got my problem sorted out. When the bike is cold #3 will not fire up right away, but after 20 secs or so it does. Doesn't always do it, doesn't effect the performance at all so I just ride the **** off it anyways.

[tkent02]

Most likely a choke issue... Clogged fuel feed or one actuator upside down or something similar.

[slyone]

Well I checked the plug wires visually and coil wires, tried swapping coils, no change..#4 not firing..back to air/fuel..choke is fine/actuators correct-fat side down. I'm thinking fuel/air except why does it run right now & then? Think I'll turn in, these late nights are wearing on me
Oh and I found the inside of vacuum hose to petcock wet/damp, but my problem lies with #4 cyl. new petcock soon..
from azr's thread when he had issues..

#3 coincidentally, is the cylinder that the vacuum line to the petcock comes from. The one that sucks fuel in if the petcock diaphragm is bad. The one that will often be too rich to fire even with perfect carburetors. The one that most commonly fouls plugs.
And the one most likely to have problems like these.

Is it a coincidence?

You decide.

[slyone]

new plugs today, did the trick! hope it stays that way..

[matt1100]

"Sometimes it works, Sometimes it doesn't" sounds like an electrical issue to me. Try swapping cyl 1 and 4 leads. If the problem moves to cyl 1 their is an issue in the coil/wire