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First of all, *wave* to everyone, and compliments of the nice forum 
I'm the new owner of what is my very first bike, a 1978 GS750E. Overall it's in very nice shape, some minor surface rust here and there on the chrome, but a very clean bike overall, and EVERYTHING is original, save the paint.
So I listen to the thing idle, have a friend who has a license test drive it, everything is great, I buy the bike, good stuff. A few days later, as I am testing the tach after I cleaned and oiled it (it were a bit lazy) I reach down to tap the #1 pipe to make sure the bike isn't overheating yet. Then I touch the pipe. Then I grab the pipe with a full-on fist grip. Then I burn the ever-loving #$#& out of my hand when I grab the #2 pipe.
A few minutes and some ice later, I go back to scratching my head at the thing, and start wrenching over the next few days.
So far I've:
-Done a compression test, all cylinders OK.
-Replaced and adjusted the points (yes I used a timing light).
-P/O replaced the plugs and boots, I checked both, carbs appear to be running rich as most plugs were black, except #1, which had less black and was wet with fuel.
-Checked #1 for spark, looked OK.
-Swapped #1 and #4 wires, #1 still cold.
-Made liberal use of words like "huh" and "hmm" and "&%@*%*-%&$!(*"
So far my guts tell me that I have eliminated the ignition system (and here I thought they were only for digesting sammiches). This leads me to believe I have a fuel/air problem, what with those being the only other two things necessary for combustion and all.
Air box seems clean, I adjusted the air screws and the idle adjuster so it purrs nicely at 1000 rpm, compression test is good and no blowback "pop" so I gather the exhaust valve is working properly, and a wet plug leads me to believe that the intake valve is working properly.
I gather the carbs are running rich from the black plugs, don't have a vacuum sync tool, so I haven't adjusted fuel yet. Is it possible that #1 is running so rich that it isn't firing? Any other ideas?
I'm the new owner of what is my very first bike, a 1978 GS750E. Overall it's in very nice shape, some minor surface rust here and there on the chrome, but a very clean bike overall, and EVERYTHING is original, save the paint.
So I listen to the thing idle, have a friend who has a license test drive it, everything is great, I buy the bike, good stuff. A few days later, as I am testing the tach after I cleaned and oiled it (it were a bit lazy) I reach down to tap the #1 pipe to make sure the bike isn't overheating yet. Then I touch the pipe. Then I grab the pipe with a full-on fist grip. Then I burn the ever-loving #$#& out of my hand when I grab the #2 pipe.
A few minutes and some ice later, I go back to scratching my head at the thing, and start wrenching over the next few days.
So far I've:
-Done a compression test, all cylinders OK.
-Replaced and adjusted the points (yes I used a timing light).
-P/O replaced the plugs and boots, I checked both, carbs appear to be running rich as most plugs were black, except #1, which had less black and was wet with fuel.
-Checked #1 for spark, looked OK.
-Swapped #1 and #4 wires, #1 still cold.
-Made liberal use of words like "huh" and "hmm" and "&%@*%*-%&$!(*"
So far my guts tell me that I have eliminated the ignition system (and here I thought they were only for digesting sammiches). This leads me to believe I have a fuel/air problem, what with those being the only other two things necessary for combustion and all.
Air box seems clean, I adjusted the air screws and the idle adjuster so it purrs nicely at 1000 rpm, compression test is good and no blowback "pop" so I gather the exhaust valve is working properly, and a wet plug leads me to believe that the intake valve is working properly.
I gather the carbs are running rich from the black plugs, don't have a vacuum sync tool, so I haven't adjusted fuel yet. Is it possible that #1 is running so rich that it isn't firing? Any other ideas?
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