windturbineman
ArboristSite Lurker
what do you guys use for right angle porting tools?
Sorry, your 090 is the best im sure.:msp_mellow:I still don't know what kinda saws you guys what built???Hot mod,full race,what?
I'm wondering if you don't take over each counties like ants do nests??
Hey you can kidnap my mother-in law if I do you how much???(How hot a saw in return?)
So interesting....
Back in in 1986 it tried to build the hottest 090 ever built,absolutely no limits. I spent many months,lots of effort,money and sweat building it,to compete in HOT SAW-under 140cc.(According to rules in B.C. Canada then.) The hardest part was competing against the race go-kart race engines used by most logger's sports Pro's at the time. In several competitions I beat most of the go-kart engines,except Ron Hartil's Comet rotary valve kart race engine,that was hopeless.
Some specs on this 090 are:
-Billet Aluminum cyl. head,special comb. chamber,210 psi compression
-Full race porting,5 transfer ports,7 windows in lightened piston,reed valve assembly from motoX engine.
-Monstrous carb,(Mikuni),equivalent of Tillotson HR,from 440 snowmobile engine(11/2"-2" bore)
-modified and welded crank
-Lightwieght alum. flywheel and electronic ignition fro smaller model Stihl
-Race pipe designed for 12,500 toque peak
-14,500 rpm limit set before competition
It was an exciting beast to run!
I eventually sold it to a collector in the U.S.A.
I'll try to put some photos,hope they work...View attachment 189958
Big bore 090's Art's a good friend of mine and yes he has one
Stihl 10 cube 090 Engines.... .......................
McBob.
Unfortunately I never took any detailed closeup photos of the saw at the time,so it's hard to see any of the mods.
A few years ago I discarded the blueprint for the head,I regret that now...
I also later added the smaller lighter 070 clutch.
Flywheel and ignition were from an 042,it fit the taper on the crank,then it was easy to adapt a starter cup from something? for the 090's old style Fairbanks-Morse starter.
I managed to enlarge a photo,you can better see the billet head,reed valve box,and the huge Mikuni diaphragm carb(about 35mm).
View attachment 224305
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