G'day, I have a Masport mower here that's only a few years old and has had very little use..

The problem I have is its over revving. Now it does this even with no governor spring attached...at this stage I am wondering if it could be an internal problem with the governor? I can bring the revs down my holding the butterfly..but without holding it the engine just pulls it on full ball..

I also removed governor arm to try and fault find and I am now unsure of position it should be refitted..

I have tried to get a service manual for this engine which has left me frustrated..I am sure you guys will know whats going on, would appreciate any help thanks