Kx125 complete rebuild

Perhaps you can shine some light on this, but I never totally grasped the concept of the Power-Valve Governor?
My YZ250 didn't have one, but then again, that bike was a total mess when I bought it.
It is gear driven off crank. The blaster has a fixed Exhaust port.the only way to raise it and the power band. Is to remove material an raise port height.this power valve
Perhaps you can shine some light on this, but I never totally grasped the concept of the Power-Valve Governor?
My YZ250 didn't have one, but then again, that bike was a total mess when I bought it.
The blaster has a fixed Exhaust port.port height will not change unless you remove material.the power valve gives you a broader power band. I will take pictures tomorrow and explain .it will be easier to understand
 
Perhaps you can shine some light on this, but I never totally grasped the concept of the Power-Valve Governor?
My YZ250 didn't have one, but then again, that bike was a total mess when I bought it.
It is gear driven off crank. The blaster has a fixed Exhaust port.the only way to raise it and the power band. Is to remove material an raise port height.this power valve
Perhaps you can shine some light on this, but I never totally grasped the concept of the Power-Valve Governor?
My YZ250 didn't have one, but then again, that bike was a total mess when I bought it.
The blaster has a fixed Exhaust port.port height will not change unless you remove material.the power valve gives you a broader power band. I will take pictures tomorrow and explain .it will be easier to understand
 
Ill take some pictures of cylinder tomorrow.it will be easier to understand


To keep you entertained till then
 

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pic of governor.the 4 balls are setup on a ramp. Centrifugal force (rpm) makes the balls ride up the ramps they are in.
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which moves this rod that is attached to the power valve. Shaft
 
This is power valve shaft
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just moves up and down according to rpm.
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you can see power valve in the down position it the exhaust port(low rpm)
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upper position(high rpm) wfo how i ride:D. Notice exhaust port is higher(higher rpm power)
 
This is power valve shaftView attachment 34365 just moves up and down according to rpm.View attachment 34366 you can see power valve in the down position it the exhaust port(low rpm)View attachment 34367 upper position(high rpm) wfo how i ride:D. Notice exhaust port is higher(higher rpm power)
Well then someone decided to remove it on my old YZ. Now wonder that thing scared the ever living crap out of me...I could never predict when the powerband would hit.
 
Got the clutch in it and tourqed
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installed topend and head
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and vertex gaskets.made in the good old. Usa
 
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Next time I pass the Boyesen factory, I'll have to take a picture.
That place is small, like mom-n-pop small.
That would be cool to get a picture. Just staying with same type of reed that was in it .replacement petals ate cheaper than going vforce
 
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That would be cool to get a picture. Just staying with same type of reed that was in it .replacement petals ate cheaper than going vforce
I can tell you having had a set of VForce Reeds, you're better with the Boyesen. I mainly used the VForce because of the expansion chamber they used on my bike.
 
I can tell you having had a set of VForce Reeds, you're better with the Boyesen. I mainly used the VForce because of the expansion chamber they used on my bike.
Like the vforce run them on the blaster. Didn't feel like spending the 150. On them. It's a spare trail bike boyesen work well
 
Got alot done today:rolleyes: put the two bolts in for csae saver. Should have motor in this weekend .
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