Chainsaw Repair

I built a 090 running a 34mm alky carb and pipe in the early '80s. But went on building myself a YZ125 bike saw because someone else built a 400cc Husqvarna bike saw.
 My YZ and my brothers Mac 101 kart saws built by Bob Walker beat the 400 almost every time in our local small wood.
In 1989 Bob Braden a Stihl dealer from Regina, Saskatchewan bought a 090 built by Stihl rep John Curry from London, Ontario head office. It was fast beat the Macs no problem and gave me a good run for my money.
It had a cut off head expoxied external tranfers and a wicked pipe and carb setup. Fastest 090 I ever seen.