excess650
Addicted to ArboristSite
I finally broke out the new tach
http://www.amickssuperstore.com/DTI...chometer_Tach_p/dti tech-tach tt-20k tach.htm
and used it today. I had bought a used 272xp, and it was way out of tune. I did get it running half decent by ear, but the tach sure shows how far off things can be. Anyway, after letting the saw idle to warm up with fresh 40-1, I fooled with the low speed mixture and idle. After it seemed close, I tuned for max revs, and could get ~13,600. I richened the high speed mixture back to 13,000, and then fooled with the low speed and idle, and then back to the high speed until I was satisfied, leaving it at 13,000.
Having read that you should tune with your shortest bar, I had 20" on it. Since this saw is going to be tried on the mill Saturday, I mounted the 28", and just for S&G, I put the tach on it to see how many revs it would lose. It GAINED 600 rpm! I tuned it back to 13,000 and called it good.
I feel better with the tach!
http://www.amickssuperstore.com/DTI...chometer_Tach_p/dti tech-tach tt-20k tach.htm
and used it today. I had bought a used 272xp, and it was way out of tune. I did get it running half decent by ear, but the tach sure shows how far off things can be. Anyway, after letting the saw idle to warm up with fresh 40-1, I fooled with the low speed mixture and idle. After it seemed close, I tuned for max revs, and could get ~13,600. I richened the high speed mixture back to 13,000, and then fooled with the low speed and idle, and then back to the high speed until I was satisfied, leaving it at 13,000.
Having read that you should tune with your shortest bar, I had 20" on it. Since this saw is going to be tried on the mill Saturday, I mounted the 28", and just for S&G, I put the tach on it to see how many revs it would lose. It GAINED 600 rpm! I tuned it back to 13,000 and called it good.
I feel better with the tach!