Stihl Early 066 vs Non M-tronic Version #1 661

This is the second to last in a series of videos of these two going head to head in various forms. It started with both in "stockly", aka sickly, tune going head to head with the 066 coming out on top.
I zipped the 066 and it stomped the stockly 661 pretty handily. I then zipped the 661 and left it in m-tronic trim and it came around nicely but still was getting beat. I then swapped out the stock HD-2 air filtration system for a Max-flow assembly and the 661 pulled slightly ahead of the 066. Next on the list was an "operating system upgrade" where I took out the m-tronic components and put in the first version of unlimited coil and adjustable carburetor as we see it here. The 661 runs a little better than the 066.
It is important to note that the 066 is by no ways or means a slouch. My guess is that it will handle a 50" bar saw-weetly. I did take the 661 a little bit further tune wise than the 066 in the end.
I scrutinized the original clip thoroughly. Time runs as follows:
066 @ 13,320 K 14.72 & 14.07
661 @ 13,320 K 14.57 & 13.05
I'm well pleased at how the builds turned out. I think the 066 will come around a little bit more with time as the new bearings and seals get more "comfortable" with the process. With any luck, the owner will give us an opinion/update at some point.
I am currently available for custom saw modifications. If you are interested, please shoot me an email.
[email protected]
Thanks for watching.