Petcock problems?? or Vaccum line?

[bexabarr]

Hi everyone,

My bike is not starting all of the sudden. I noticed that I’m not getting any fuel from the petcock. I took it apart and looked for any clogged holes and everything looks excellent. I also tested it by sucking a bit on it, and it worked fine (may not be the best way to do it). I then suspected that maybe the vacuum line was clogged… so I sucked on that too, and blew in it and found no resistance (also may not have been the best way to do it). I manually filled the carbs and the bike started just fine, I checked the vacuum line coming out of the carb body (carb body #3, off vm22s is this the right one?) and noticed that when I put my finger on it that it was barely creating a vacuum…. Maybe the vacuum line is in fact working fine, and it is the petcock… but it was working fine a day or two ago. Ideas? thanks

[arveejay]

If you just adjusted the valves they might be too tight on that cylinder. Loose rubber on carb 3? Worn rings, no compression. Vac hose have a leak?

[rphillips]

Not sure how much in lbs. & oz., but very little vacuum will operate the petcock.

[bexabarr]

Hi, I seemed to fix the problem (or it fixed itself). I did just adjust the valves... interesting... what I did was that I manually put some gas in the bowls let it run for a while and then the problem just went away and it started working. The bike runs great now. Thanks for the responses.

[SqDancerLynn1]

If the fuel bowls were empty It can take forever to start, That is what prime is for. On my bike if it has sat for a fewdays I always put it on prime for a few seconds