Stihl MS660: Stock vs Big bore with Titanikel Cylinder

Two Stihl ms660 chainsaws - stock vs hyway bigbore pop up
Results were not what I expected
Factors could be
Exhaust isn't open enough to get rid of the burnt fuel
Magneto may be limited so it can't surpass a certain rpm
Timing with Hyway cylinder is slightly off.

[@richardstutler3058]

Sounded like you were running chains a little bit tight, not good for your bearings.

[@chrismuncey3861]

0.015 is a little tight for a saw that size.

[@theoccasionalfarmboy]

Yes, I was sort of holding my breath first startup, but it's still running with 220psi of compression. I posted a video taking down a 90' tree about 3 weeks ago, and closer to the end of the video, I'm using it to cut up the trunk.