how do you take apart a sn89??? pics inside

You need to remove the 12 point bolt that holds the impellor to the output shaft and wiggle the impellor off the shaft. Should have two roll pins in the end of the shft to keep the impellor from spinning if memory serves. Be carefull around the output seal, it's expensive. Usually they burn up and the balls will have pits or the castle drive will have excessive wear where the balls are driven. Be sure to take the oil pump piston out before reassembling or you risk damaging the input shaft eccentric.

While it's apart take and port the outlet of the blower and then sand it smooth and finally polish it. Run some synthetic ATF and the thing will put out 8-10 psi on a stock motor.

Juts rebuilt one for a friend and the rebuild kit was $450 from paradise wheels and $75 for the oil pump. They suck, but they are the only authorized dealer around.

Jamie