yz250 powervalve governor pin keeps ejecting

adam8781
Posts
670
Joined
12/22/2015
Location
CA
7/2/2017 2:58pm
Im having a weird problem i cant seem to figure out, its on a 06 yz250, the power valve Governor by the water pump keeps spitting its pin out when the motor is running, it will run fine for a bit than lose all top end power. I pull the inner clutch cover and the 4 weight balls fall out as i remove the governor.

that pin in this pic is somehow making its way out



i tried another governor out of a friends 03 yz250 and it didn't happen again. but when i compare them on the bench they are identical in every single way,

what am i missing here? I've had 2 pins go through my motor chipping up gears, i need to figure this out asap

|
kijen
Posts
1029
Joined
10/1/2010
Location
Jacksonville, FL US
7/2/2017 5:06pm
No help, but I would just buy a new govener, it's 11 years old, bound to wear out I would think.
Paw Paw
Posts
679
Joined
12/24/2011
Location
Benton, LA US
7/2/2017 5:29pm
kijen wrote:
No help, but I would just buy a new govener, it's 11 years old, bound to wear out I would think.
X2 or get a new roll pin fitted to your shaft.

Paw Paw
partialperson
Posts
410
Joined
11/6/2006
Location
Murphysboro, IL US
7/3/2017 6:22am
The new roll pin fitted to the shaft makes sense. The shaft would have been my first guess as two pins have been used with the same result. If you had not used another power valve governor with good results I would have also been suspicious of the power valve hanging up and loading/unloading pressure on the pin. Like you do during assembly when you are supposed to lock the arm while tightening the power valve bolt on the cylinder assembly
pete24
Posts
2733
Joined
10/20/2011
Location
Marlborough, MA US
7/3/2017 6:36am
there is wear on the shaft and in the hole in the cup, when you let off the gas the revs come down the balls retract and the cup sticks just enough for the spring to not be able to push it back and the pin falls out, happens enough that i figured it out

Post a reply to: yz250 powervalve governor pin keeps ejecting

The Latest