Timing is retarding while reving? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 2 (permalink) Old 03-10-2012, 02:05 PM Thread Starter
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Timing is retarding while reving?

I recently had to replace the cams in my bike, a 2005 vn750 and I got the thing running but when I took it out to ride it completely cuts out at 4000rpm. I thought I had the cams in wrong, but pulled the engine again and checked. They were off one tooth on one cam so I fixed it and when I retried the bike on the road it still cuts out. We decided to check the timing and it appears that the engine is retarding the spark during reving instead of advancing... that is.. the the timing mark is moving counter clockwise instead of clockwise while checking with a timing light. So why is my bike retarding the spark instead of advancing it?
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post #2 of 2 (permalink) Old 03-10-2012, 04:53 PM
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You got lucky on the cam chain. One of the reasons I don't like the Vulcan's unnecessarily complex cam chain arrangement. To many places you can make such a simple mistake.

The ignition advance is controlled by the IC igniter. It goes from 5 degrees BTDC at idle to 25 degrees BTDC at 3500 rpm. This curve is built into the igniter, and if it is not right, you need to replace the igniter. Timing advance is not adjustable.

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
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