Chainsaw Repair

The Jonsereds 80 was my classic logging saw. First I owned and worked with the 621 in 1974, then a year later upgraded to the 80, I loved the power and toughness of that saw. The inboard clutch was unique for the time also.
 My older brother had a 111 Jonsereds, but his 80 was quicker cutting in the local powersaw speedcutting contest.
 Heres's some pictures from 1975 of myself and my 2 older brothers racing our 80s at our competition cutting 12"x12" white spruce. I'm in the fur cap at 17 years old. I was the green horn there as the picture shows me cutting a line which disqualified me, cut between the lines only was the rules.
My oldest brother Cliff [ in the vest ]was the champ for years, one trick he did to his 80 for extra speed was remove the bottom piston ring, but that was only part of his technique ha ha, he could file a chain better then anybody in the area plus super quick reflexes from the cold start, the first down cut, the 2nd up cut and the final down cut.

Removing the lower piston ring from saws that come with two isn't unusual at all, hardly a "Secret" (but it may have been back then?)

I still couldn't imagine trying to keep the 2nd up-cut and 3rd down-cut between the lines in timed cuts.  Looks to be about 2 inches between lines

Did they do this for cold dead start racing too? Then I couldn't imagine the 1st cut between the lines either.