1985 VN700 Carb/Petcock Issues. At my wit's end.
Hey guys, I'm having a rather annoying issue with my '85 Vulcan 700. The bike is relatively new to me, but I'm (unfortunately) having to get quite intimate with it already. Let's start at the beginning:
When I bought the bike, It was running, but needed some petcock work/fuel lines. Simple stuff, right? Right. So, I rebuild the petcock and add some fuel lines and I start riding for a few days. However, I start to notice that the crankcase fills with fuel every time I let the bike sit for more than a few hours. My head goes to the floats, thinking that they aren't shutting off. So, why fix the problem when I can just add a fuel shutoff? So I consult the all-mighty VN750 forums and see the plethora of posts recommending the petcock for a TW200. I follow that to the 'T' and it works GREAT! I even got the bike out on the back country roads for the first time. Love it.
Here's where the fun starts- within the next couple of days, I'm stranded on the side of the road waiting for my floats to fill up. Eventually I limp it home and get to work. My first thought is obviously floats or needle valves, so I check those. Replace the needles and everything works as it should. Until I ride it. She'll idle forever, but as soon as I get a mile from the driveway, she's done. I've had to push it home 3 times now. Took the petcock apart, cleaned it, made sure all the ports and screens were clear, cleaned the jets, tried everything. Still no dice. It rides like it's draining the floats, but yesterday after some more tinkering and cleaning, it wouldn't even start after some time to fill the floats.
My buddy is convinced its either the coil or plug wires, and the floats aren't actually draining, but the bike is heating up, thus increasing the resistance of the wires or expanding a hairline crack in the coils. I'm not saying he's wrong, but I want a second opinion before I start throwing coils, wires, and plugs at the bike.
What do you guys think? Thanks!