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Join Date: Nov 2007
Location: Chandler, Arizona
10 weeks with gas in the carbs? No wonder it won't run. The jets are plugged up. The reason it will run on choke is that the Vulcan 750 doesn't actually have a choke, it has an enrichening circuit, which bypasses both the main and pilot jets. When you turn the "choke" off, it no longer gets gas. I agree with draining the carbs and filling them with Seafoam and letting them soak. Try to start it with the carbs full of nothing but Seafoam. It will fire, but probably won't run. The idea is to actually suck Seafoam into the jets. I don't recommend any kind of automotive carb cleaner, it is keytone based, and will damage the rubber and plastic parts in the carb. If the Seafoam doesn't work the first time, try it a couple more times before pulling the carbs to clean them.
I strongly recommend that if a bike is going to sit that long, that you drain the carbs, fill them with WD-40, then drain that. It wil protect the inside of the empty carbs from corrosion. And yes, I know a lot of the time people do not PLAN on it sitting that long, myself included. I have done the same thing you did, and I paid the price. Now I try to watch it.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike