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kraaazymike · 07-04-2009

Hey guys, this is my first post here. I'm hoping you guys can point me in the right direction and give me some ideas.

I bought my Vulcan EN500 new two years ago at a dealership and now has ~6k on the odometer. The other month while riding at around 75mph on the freeway, the engine felt like it lost all power but was still running. Slowly but surely the bike slows down and the engine quits. I pull over to the side of the road. The oil and battery light are on and nothing else looked out of the ordinary so I tried starting it again. It took a few tries to start but it started right up and ran as smooth as nothing ever happened.

I was able to repeat this 4 or 5 times at highway speed and never at any speed lower than 75mph. So after checking the obvious and battery connection, I got to installing a tach to get a better feel for what was going on. I found that if I cruise at ~75mph(6k rpm) the engine will spontaneously drop to ~4.5k rpm. If I loosen the throttle, the RPM's drop by 500 or so in increments until the engine completely dies. Increasing throttle has no effect.

I took it to the dealership as it's still under warranty on June 8th. It's July 4th now and yesterday they told me they can duplicate the problem but can't figure out why it's happening. They checked fuel lines and everything electrical but they're close to giving up. So now they want to charge me the $90 diagnosing fee for my bike that's under warranty for the 5 man hours they spent to tell me they can't fix it.

Anyone got any ideas? I'd appreciate any and all help!

07-04-2009	#1 (permalink)
kraaazymike Newbie Join Date: Jul 2009 Location: Orange County, CA Posts: 17	EN500 Stalls on Highways Hey guys, this is my first post here. I'm hoping you guys can point me in the right direction and give me some ideas. I bought my Vulcan EN500 new two years ago at a dealership and now has ~6k on the odometer. The other month while riding at around 75mph on the freeway, the engine felt like it lost all power but was still running. Slowly but surely the bike slows down and the engine quits. I pull over to the side of the road. The oil and battery light are on and nothing else looked out of the ordinary so I tried starting it again. It took a few tries to start but it started right up and ran as smooth as nothing ever happened. I was able to repeat this 4 or 5 times at highway speed and never at any speed lower than 75mph. So after checking the obvious and battery connection, I got to installing a tach to get a better feel for what was going on. I found that if I cruise at ~75mph(6k rpm) the engine will spontaneously drop to ~4.5k rpm. If I loosen the throttle, the RPM's drop by 500 or so in increments until the engine completely dies. Increasing throttle has no effect. I took it to the dealership as it's still under warranty on June 8th. It's July 4th now and yesterday they told me they can duplicate the problem but can't figure out why it's happening. They checked fuel lines and everything electrical but they're close to giving up. So now they want to charge me the $90 diagnosing fee for my bike that's under warranty for the 5 man hours they spent to tell me they can't fix it. Anyone got any ideas? I'd appreciate any and all help!