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Old 03-14-2010, 03:03 AM   #75
Nanuq OP
Aventurer by Trade
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Joined: Dec 2007
Location: Point Hope, Sitka & Biorka Island- all in Alaska
Oddometer: 1,102
Originally Posted by kdxkawboy
I've seen people crack the left side cam caps by not getting them properly lined up with the ring on the camshaft that goes in that grove. I know because I did that and had to do a JB Weld repair. I suspect your doo spring gave out and some how got trapped in a way that caused the cam chain to jump when the balancer chain jumped, as the sprockets for both chains are side-by-side on the crankshaft. When the cam chain jumped this more than likely caused the intake valves to be opened when the piston came up.

Question would be how often did you do the balancer chain tension adjustment? If this adjustment is not done frequently the doohickey can be in the position that leaves the spring stretched, leading to premature failure.
2008 KLR 685- Iron Butt Association #44803
Trippin' in the Yukon & the AK!

"I'd rather wake up in the middle of nowhere than in any city on Earth" - Steve McQueen
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