Not 100% sure which pin you are refering too, there is a pin pressed into the crankcase, it actuates the throw on the pump shaft, i am guessing this is what you mean? i have never had to replace one of these pins, there is just nothing to go wrong with it other than if it should fall out. To remove the pin it is just a case of grabbing it with a suitable pair of pliers and pulling it out, to replace it, you just need to drift it back in, the pt no. of the pin is 721121040.
Husqvarna man, January 2010
