10/23/2025
Just a few of the MS660 upgrades I do on kit builds. Fixing bar tensioners and stroking oilers for increased flow.
A customer recently asked what the stroke was...so I went and measured a modified one for good measure! Crunch a few numbers and whatya know its pumping debatably 37% more (I'm not a mechanical engineer...fluid viscosity, temperature, etc etc). 1.42mm stroke vs Stihl's 0.9mm stroke and more than the 1.15mm high output pricey upgrade.
Last time I really watched it it was using a tank of oil faster than a tank of fuel... adjuster still works. Easy solution to running out of oil is to not fill your fuel fully. More breaks and can talk lots of smack that you're working harder than everyone else!