Chainsaw Repair

Oils effect saw tuning also.

Some synthetics do not contribute to combustion and to go from Pennzoil air cooled at 32:1 to say like Red Line at 32:1, your saw will suddenly be noticeably lean.

Cut4fun and I swap saws sometimes and he uses Klotz at 32:1 and this always requires a re-tune because I run Pennzoil.

My original intent was to try some alternative fuels, and I was getting what I consider wide differences in tuning between brands, as much as half a turn form one type to another. I was using a saw that I own, that had not been run in a few months. I don't get why it would not affect the tuning so widely either.

I thought that there would be minor differences but nothing like I was getting earlier. It was late in the day when I switched out the carb, so I will run the tests from the beginning again tomorrow!

I have not torn the carb apart yet but my bet is that the check valve IS or went bad while I was messing with the saw. I just put on a new carb and set it at 1&1, started right up and would idle. Will set the H side in the AM and put it in wood. Still concerned about plug color but we will see.