Could this be one of the causes of rocker arm failures on the 690?

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Gee eS

Race Dog
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Nov 9, 2008
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Roodepoort
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KTM 790 Adventure R
I decided to check valve clearance on my 690 in preparation for my upcoming trip to the Koes rally. The outlet valves was in spec while the inlets were below the minimum clearance and had to be adjusted(re shimmed).

I noticed that the roller shaft on the inlet rocker arm have started to come out and that there was rubbing marks on the side of the exhaust valves rocker arm. When I removed the rocker I could with some effort push the shaft in and out with my fingers.



I strongly suspect that if the shaft come out far enough at the right time it would hook on the top of the other arm and that this could be one of the causes of rocker arms breaking?

The roller bearings did not have any play so I decided to just pin the shafts of both rocker arms to prevent them from coming out again.


Now to see how long my fix is going to last.

PS. If I ever have to buy new rocker arms, I would pin the new ones before installing them!
 
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