well i checked all 4 carbs and they were all filled with fuel. Also checked vacuum at the line and was fine
what do you consider fine? Did you remove it, inspect it, draw a vacume on it with one end plugged to be sure, while flexing it?
here
so i just let her run for 17 min with the petcock on prime with no shutoff. It ran through quite a few cycles of the cooling system. In past tests it had shut off much quicker than the time i gave it on this recent test. I am going to let the bike cool and try again with the petcock on run and just a note the tank cap is off so vent issues are not a problem. I will update with results as soon as i get them.
then
Ok just went out and did the test with petcock on run. Suprisingly she shut off after about 2 min. Wasn't even all the way up in the heat range but sure enough i was unable to restart so same as always. Checked the fuel level in the #1 carb and it seemed to be full. In light og this i think we can eliminate a fuel starvation issue. Whats next?
it takes 3 things to run:
spark
sounds like that is fine,
air
I dunno, pull the airfilter, and check it.
FUEL
You did 2 things at once during the one experiment, you ran it on PRIME, and had the cap open....
these are things Steve and I insist that you can only do one change at a time when anylizing problems you don't understand.
so, you can repeat the first experiment with the cap shut, or go further.
It may be a problem with the cap vent, but I cannot say without disassembling it in my hands. With that said, it sounds like a fuel dlivery issue.
The diapragm in the petcock will have a hard time overcoming the vacume if there is high pressure on the tank, but should still work...
that takes this down to the diaphragm. having fuel in the carbs, is NOT the same as having the CORRECT amount of fuel to keep the bike running. The bowls can partially re-fill, but still not be at a proper level to run correctly. You cannot discount this by saying you find fuel in the bowls.
Diaphragm, vac line, tank vent, and even possibly blocked carb breather tubes (the 2 clear tubes running up from the carbs, and along the upper frame, which allow the carbs to be open to atmospheric pressure, and fill correctly...they get blocked with spider egg nests at times...)
all in the order of the way I note them....
that's all I can offer.