Bike sitting for 10 years, no start just backfire
Ok I did do the search before I asked. All of the suggestions I've tried, only partial exception is battery. Ok so picked up an old 84 VT 700. Its been sitting in a garage for about 10 years, and I was told it was "started" 2 years ago. So first thing I do is pull the carbs, and give them a really good cleaning. They were prob the worst carbs Ive seen so far. But after 4 hours in the ultrasonic they look good as new. I ended up having to replace the diaphragms, and choke cable. So after all of that was done, I wanted to see if I could get it to fire. The bike didn't come with a battery, so I used my charger/booster to start it. Well a bunch of seeds flew out of the exhaust, and after a few more tries it just backfires. Sometimes out of the carb, and sometimes out of the exhaust. I decided to go back to the drawing board. Got fresh gas and new plugs, no seeds this time, but plenty of backfires. I pulled the plugs out again, and verified i had spark, seemed to be pretty strong. I started doing more research, and read these old bigs are sensitive to voltage. They need a strong battery, or they will do what my bike is doing now. I ended up having to order a new battery, so I figured I would try a car battery i had laying around. Put it on the charger for a bit, measured about 12.8 volts and tried that. Same result. I also read issue could be linked to a bad stator. I just checked that it seems to be fine. Continuity is good with all three posts, and no continuity to ground. So battery should be here Tuesday in the mean time I'm trying to rule out any other root causes. They way it acts i think it could be timing related. Good news is i have 150lbs of compression on both cylinders. I'm going to let this car battery sit on my battery tender for a day or so and try it again. Also I totally bypassed the fuel system, and connected a bottle of gas directly to the carbs. I also tried spraying a mist of gas with same result, boom. I knew going into this it would be a challenge to get running again. But I figured I would be alot further by know. Heck I got an old Pontiac Deluxe running again after sitting for about 30 years. All that took was a carb rebuild and points/condenser adjustment. I do have the manual, and hoping it can provide some knowledge.