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Join Date: Nov 2007
Location: Chandler, Arizona
I agree, the carb vacuum thing is the most likely cause. If you are new to the Vulcan 750, it has a number of peculiarities. The very first thing I would do after getting the engine running right, is to check and lube the rear driveshaft splines. Hopefully they are still ok.
Also keep an ear out for cam chain noise, as the tensioners tend to fail, and for noise from the left front of the engine, because the rubber dampers in the balancer assembly tend to fail after several years, allowing the balancer to dig into the case, causing a lot of damage.
When you change the oil, use the drain on the left dide of the engine, not the one on the bottom, and check the screen for any signs of debris.
Just so you know, if the stator fails, you have to pull the engine at least part of the way out to replace it. This isn't actually difficult, but very time consuming.
The VN750 is a great bike when everything works right, but I found out a long time ago that you really can't compare it to anything else. It's definitely one of a kind. Jerry.
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