My '79 GS750E developed in a new issue....it won't stay running unless the petcock is in the prime position. I suspect there's a problem with the petcock...time for a petcock rebuild kit or a new petcock? Ironically, new carb and intake O-rings were on the way as routine maintenance before this issue popped up. Any other issues I should be checking?
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Me, I would get a new petcock, kits have a high failure rate it seems. Check over your rubber intake boots (engine side and air filter side) Orings you already ordered, make sure they are soft and pliable. Hard boots will crack and not seal good, causing air leaks you don't need. Makes tuning a *itch.
Would be a good time for a valve adjustment if you haven't done one in a while. And would be a good time as well to give your electrical connections a good cleaning and replace anything questionable and or burnt. -
I'd check the vacuum line to make sure it hadn't cracked, or popped off1978 GS 1000 (since new)
1979 GS 1000 (The Fridge, superbike replica project)
1978 GS 1000 (parts)
1981 GS 850 (anyone want a project?)
1981 GPZ 550 (backroad screamer)
1970 450 Mk IIID (THUMP!)
2007 DRz 400S
1999 ATK 490ES
1994 DR 350SESComment
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Occam's Razor!!1978 GS 1000 (since new)
1979 GS 1000 (The Fridge, superbike replica project)
1978 GS 1000 (parts)
1981 GS 850 (anyone want a project?)
1981 GPZ 550 (backroad screamer)
1970 450 Mk IIID (THUMP!)
2007 DRz 400S
1999 ATK 490ES
1994 DR 350SESComment
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Got to love the quick cheap fixes, especially when they actually work!Comment
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Reconnecting a vacuum line will help the mixture in that cylinder too.
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mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
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(Click on my username in the upper-left corner for e-mail info.)Comment
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D'oh forgot about that dang vacuum line.Comment
I hadn't thought of that, so I took a look....sure enough, the vacuum line was disconnected. That should help me sleep better tonight! Thanks to both of you for the replies! 
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