did some chain testing yesterday with the 66R and a 36" bar. IMO the 661 drives a 36" no problem and oils fine.
The chains are -
Factory RS
RS resharpened with USG 30/40/10
RSLH (sq grd half skip) converted to RS H (rapid super/round ground half skip) with USG 30/40/10
all 3 chains have done the same amount of cuts before this test. Approx 15 ea.
Saw 661R, bar tsumura 36", oiler at max
Wood - Cherry or Rock Elm one of the two....it's hard as a rock and now it's frozen. About 15 out yesterday.
factory RS
RS resharpened USG 30/40/10 -
RS "H" converted from RSLH resharpened USG 30/40/10 ...you'll have to excuse my language at the end
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New wood - willow and oak
factory RS
RS resharpened USG 30/40/10 -
RS "H" converted from RSLH resharpened USG 30/40/10
https://www.youtube.com/watch?v=IjGg_DABLZA
Times in Cherry -
factory RS - 33.7
resharp RS - 34.8
resharp RS "H" - 32.6
Times in willow oak
factory RS - 19.3 16.8
re-sharp RS - 19.7 17.9
re-sharp RS "H" - 18.1 13.8
man I wish Stihl made RS half skip!!! (instead of having to convert RSLH) RS "H" is soo smooth and fast.