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Join Date: Nov 2007
Location: Chandler, Arizona
Vulcan 750s are known for hot starting problems. Mine has it, sometimes it takes 3-4 attempts to get it started, and before it starts, it will sputter and backfire a few times. I mean just a tiny pop or 2, not like a 12 gauge. Nobody has come up with a definitive answer for this, it may well be more than one thing, but I do believe it is a design issue, since virtually all of them are affected.
I believe the biggest problem is electrical. I think it is caused by a weak spark while the starter is turning over the motor. But, I don't necessarily blame it all on the ignition system. I believe the starting system is also at fault. I have noticed from the time I bought my first new Vulcan 750 in 1993 that the starter turned the engine over really slow. It's not the battery, though a weak battery would make it worse. I have connected batteries to it with enough CCA to start a 5000 hp top fuel dragster, and the starter still turns slow.
All my other bikes, and my former Ninja 500, turn over twice as fast, and all of them start right up, cold or hot, unless they have been sitting for a long time. I don't know what causes it to turn over so slowly. A 750cc engine should turn over 1000 rpm with just the starter. And if it would, I think the starting problem would go away.
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