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On a removable cylinder saw,like a Stihl,if you say cut off 20 thou off the base it automaticaly does two things .First it lowers you transfers and exhaust by that much and in turn raises the intake by that much . That done many people raise back up the intake and transfers back up by that...

I really can't tell you much about a universal bench mark because I've only taken the readings on Stihls and one little Poulan I had ported . Those numbers I rattled off are pretty close to most Stihl's I' ve done . Actually the only thing it[degree wheel ] could tell you is how far down on the...

Wheel Oh dumb me got to running off in the head and forgot to post a picture of the wheel. If you want, just copy it and make your own.Easy enough to do .

Chainsaws are just a tool made for an application .Compare the saw engine with a production ran auto engine for example concerning the cam shaft and valve train . What is on the average auto is a best of all cam grind when you figure areas of starting,smooth idle and good midrange power for the...

Simple easy Shall we say you just want to get a tad more out of ye olde saw.You aren't going to race it could care lesss about being a cookie cutter .Just widden the exhaust a bit and clean up the casting flaws within the transfer ports,intake etc that might be a hiderance to air flow ...

What to change. If any.A muffler port job wil get you the most gains for the least work and it only takes a few minutes to do with minimal tools . This improvement satisfies 85 percent of most people looking to enhance a saws performance . Then we have the other 15 percent .;) So,just what do...

The intake Where all the fuel air gets in . In theory as soon as the piston starts up from bottom center it could accomodate an intake charge .it could be assumed it gets sucked in.Nothing could be further from the truth .It gets pushed in by atmospheric pressure . As the piston rises there...

What it means . Using a stock Stihlk 038 Mag for reference it goes like this starting from top . The ex opens at 99 degrees after center.Meaning that for slightly over one quarter turn the piston is in it's power stroke . As the piston continus down,now with the export opened,it exhaust's and...

How to read it . Starting at top dead center roll the engine over while looking through the ex port .When you just detect the port opening,note the degrees.Keep on roll ing and note again the degrees when it just closes.This would be your port duration for the ex .Do the same for the intack and...

Setting up the wheel . Well,first you have to have one to set up . A larger wheel such as a 12" model used on autos is more accurate but a beech to mount and use a pointer on .So I use a 6 inch myself .You can buty them or make them.Either way works just fine.If you want to make one just copy...

What are all those numbers and what do they mean.Well,here goes my attempt to explain it,bear with me . As we all know or should, a two cycle intacts fuel/air mixture,transfers same to the cylider,fires a power stroke and exhausts in one complete revolution . So what's the deal with "degrees'...