Low compression and fouled plugs, Help!
My wife doesn't ride much any more so I took her vulcan out yesterday for its twice a month exercise run. After about ten miles it started losing power, sputtering and so forth. I'm thinking, ok, old gas, gummed up carbs. I get home and dump half a can of seafoam in the almost full tank, run it a bit and turn it off. Today I go out and try to start it. Still running rough. Now there's a small puddle of what looks, feels and smells like gas mixed with oil coming from the rear cylinder exhaust. After two minute run, rear exhaust pipe it warm but not hot. The front is too hot to touch. Things aren't looking good at this point. So next, I pull the rear plugs. They are fouled with oily gas. Compression test is next. Front is 125 lbs, rear only 95. The bike doesn't burn oil, there's been no exhaust smoke and no unnatural noises. I'm not sure what to check next. The bike is a 2003 with 6,000 miles. The only real mod that might make a difference is the addition of a Jardine exhaust about 1000 miles ago. No exhaust leaks.