Members who have donated towards server costs
Join Date: Nov 2007
Location: Chandler, Arizona
Welcome. Did it run ok before or is this a bike you just acquired? Are you a mechanic? There are a lot of thing that could be wrong that would not be obvious if you didn't know what you are looking for. Usually a knocking noise is cause by a failed crankshaft or con rod bearings. But neither one of those would likely cause the engine to die. It would just keep running until something broke. It could be cam chain noise. The Vulcan 750 has had defective cam chain tensioners from the very beginning, Kawasaki never fixed the problem. Also, since the engine died, check to see if it may have been running on one cylinder. This has also been a common problem with the Vulcan 750 when first started. I don't know if anyone has ever figured out what causes it. The Vulcan 750 is a quirky machine. But that seems to be part of the reason some people like them so much. Next time you start it, rev it up a bit if it will. If it is firing on one cylinder, the extra vibration may make the other cylinder kick in. I believe it is caused by a carburetor issue. It is almost always the rear cylinder that won't fire to begin with. This issue is more common with bikes that have been sitting for a while. Try it with and without the choke.
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