golddredgergold
ArboristSite Operative
Had my boy run my 660 today for me. 42" bar. Logs pine very dry about 36" diameter. My 660 was built very conservative .028 squish. Basically matched gasket ported so its smooth in and out. Stock muffler. Wj-76 carb. I did do the ho oil pump but it does not pump enough. I think the stock pump was better. So I need to pull it and see if its 100% I wanted it very conservative as this 660 will be used on a mill and in big wood. I spent a few hours making a mandrel and lathing the cylinder base true and square. I then spent a lot of time cleaning the ports and making very nice beveled edges. I also worked the piston over a bunch smoothing. I polished the rod beam and beveled the oil holes. She rips. Now we will see how long it runs. I just did a 394 husky full rebuild. But I ported. This saw a bunch. Timing changed a bit on intake and transfers. Opened up everything as big as can be done without welding on extra. We shot a video of each running in the same log. Same 42" long bars on both saws. 394 hot rod is faster than the 660 and that's fine I want it to last a very long time. Enjoy.