Chainsaw Repair

Very interesting design I must say .An old gent on the west coast once had an 090 Stihl renown at one time as the fastest  on the coast .Could be true or an urban legion .

Al it's not an urban legion. I did the same with my Stihl 090 in the early 1980s. I got the idea with the 2 boost ports in the pistons intake skirt and addition of a reed valve intake manifold from a series of 1982 - 83 Chainsaw Age magazines [I even sent Weimedog copies of the magazines complete build on the Jonsered 111 project hotsaw last year.]
 
The p/c setup is very similar between the 090 and 111. The only thing I didn't do was install the cast iron liner and cut off head. I got the 090 running pretty fast though with a go kart 34mm Mikuni diaphram alky carb.
The kart reed valve manifold and carb I bought from Russell Karting out of Kansas City, I don't even know if their still in business. The 090 I sold many year ago and don't have a clue where it is today.
30 year old mod techniques are still very repectable today.