91 ktm 250 powervalve

knobbiethrower

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Apr 21, 2000
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#1
I'm rebuilding the jug assy. on a recently bougt 250 exc basket
case. I need help setting up power valves.
 

SFO

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Feb 16, 2001
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#2
There is an updated flapper for this model.
The oe ones would break in the middle and hit the piston.
The sub port pins are timed on the pinion with punch marks.
Line the punch mark on the pinions with the punch mark on the flap.
There is a push rod adjustment as well but I don't remember how to do that one.
I also used a govenor spring from a 93 mx250 and was rewarded with better throttle response.