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Join Date: Nov 2007
Location: Chandler, Arizona
I have always had starting problems with my Vulcan 750s, but usually only after they have sat a few days. I am on my third one, 2 bought new, last one bought used. I had to jump start the used one when I bought it. I rode it home, and immediately put a new battery in it. It is charging fine. No indication the stator has ever been replaced. Vulcan 750s seem to turn over very slowly compared to most Japanese bikes, even with a new battery. Even when jump started with a fully charged truck battery. I never checked the starter amp draw. maybe I should. On my '02 I took the starter apart and cleaned it, it was filthy inside. But it made no difference. My first thought was that after a few days enough gas evaporated from the carburetors that it took a while to refill them with that vacuum petcock. I still think that may be a part of the problem. But I also think the Vulcan 750 has a weak ignition system, and you just don't get a good spark at those slow cranking speeds. Iridium plugs made no difference.
In your case, if it won't turn over with plugs in it, you likely need a new battery. But it is also important that ALL the connections are good. That means good metal to metal contact, not just tight. Over the years I have found an amazing number of quirky problems caused by a bad ground, sometime a long way from where I suspected the problem might be. I have never made any modification to the starting, charging, or ignition systems. I have replaced one stator on an '02 bought new, at around 80,000 miles. I still have the original R/R. I did eliminate the unreliable bullet connectors in the 3 yellow wires coming from the stator.
Sorry if this post doesn't sound right. I'm on medication for severe back pain.
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