Join Date: Mar 2005
Location: Channelview, TX
[QUOTE=Mark A. Gurnsey;53440]Problem started when bike all of a sudden started to idle faster on its own then it started dogging out acting like it wasn't getting gas but I could smell gas quite strong then it died. I got it running again and noticed gas running down over the rear cylinder head. Now I am pretty sure it was comeing out of the carb vent tube.QUOTE]
Yep; BTDT. Definitely sounds like a stuck float needle. Should've sounded like it was only running on one cylinder, too.
Trash, dirt, etc., somehow gets into the float chamber, and eventually into the needle seat, keeping the float needle from closing; won't go thru the system, and won't get the heck outa the seat, either.
Before you start tearing the carbs outa there, try draining the carb for the cylinder that's acting up, then filling it thru the drain with Seafoam until it comes out the vent tube. You'll need some 3/16" clear tubing from the small engine section at the parts house, or 3/16" fuel hose; doesn't necessarily have to be clear. Make it long enuff that the end is higher than the frame. You'll also need to extend the end of the vent tube to the side enuff to keep the Seafoam from spilling out onto the bike--use a can or jar on a small stand of some kind under the end of it; and stick some shop rags or towels under the carbs to keep it from running all over the engine.
Pouring Seafoam into the tubing with a small funnel (Coleman stove funnel is perfect), close off the drain when the Seafoam starts coming out the vent tube. Let it sit for a five or ten minutes, then open the drain. When it quits, close the drain. I'd do the same with the other carb, just for grins, since I'm down there anyway.
I'd go ahead and pull the petcock off of the tank and make sure there's no trash in it, too, and that the screen(s) are clean.
Once you're done, hook everything back up, choke it, and see if she runs like she's supposed to. If she does, and then starts acting up again, you're prolly gonna have to bite the bullet and go ahead and pull the carbs and clean 'em right.
'95 Vulcan 750 "Therapy II",
aka "Raggedy Ann"
'95 VN750 project
'03 VN800B "The Little Black"
'04 VN800E Drifter project
'93 VN1500A custom project
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