Hi guys. I have an old 045 that I bought second hand in 1983. It was always a great saw that started and ran great and has done heaps of work for me. That is until I accidentally put 50:1 brushcutter fuel in it instead of 25:1. It grabbed and broke a ring which ripped up the piston but strangely did not mark the bore at all. I'm thinking maybe the broken ring might have snagged in one of the ports and chewed up the piston but didn't travel up and down in the bore. Anyway, got a new piston and rings and fitted them but now it won't start without a bit of aero. It has fantastic compression and once it starts on the aero will idle perfectly and rev freely and cut like a new saw. Once it has started and warmed up it can be switched off and restarts first pull. Any ideas on where to look for the problem?
