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Dirt Bike Brands - Other
epilogue to the '99 yz thumper stumper
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[QUOTE="will pattison, post: 62230, member: 19283"] rich- here is what i figure: 1. too much drag on the intake cam plain bearings. 2. engine idling for too long- not up to temps, which might normally have relieved that drag. 3. the drag overcame the friction from the press fit, and boom, no more cam timing. anybody who has ever been into this motor knows that getting a torque wrench onto the middle bolts on the intake cam cap is a real pain. if, like me, all you have is a 1/4" drive 8mm socket, but your torque wrench is 3/8" drive, you are hosed. unfortunately, i learned about snap-on wobble sockets a little too late. what i am trying to say here is that i probably over tightened the cam cap bolts a bit when i re-ringed the motor over the winter. when i first opened the motor after the disaster, i noticed that i couldn't budge the intake cam by hand. when i disassembled it, i found very slight galling on the surface of both plain bearings. polishing fixed that. i should say, however, that this same thing happened on my '98, but the galling was worse, and the cam gears never slipped. i also polished that problem out, and then ran the motor another 120 hours with zero issues. i also had a buddy trash his head on a '98, and i think it was for the same reason. the moral: get whatever tools it takes to put the correct (10nm) of torque on those cam cap screws!! wp. ------------------ will pattison engineer, racer ignition www.ignitioninc.com [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
epilogue to the '99 yz thumper stumper
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