magicmanar98
ArboristSite Member
I bought a used MS440 a couple months ago. Never even started it up. I was planning on taking plastics off and just cleaning it up. Well, it didn’t quite work out that way. I tore it all the way down short of splitting the case. Bearings were still good. I decided to try a port and polish job which led to lots and lots of reading. I widened intake and exhaust and smoothed them out nicely. My noobism gave me little leeway to work on transfers so I just cleaned out imperfections and widened a touch. I have this dremel wheel that is basically a scotch Brite pad and put a nice cross hatch on smooth bore. Put a new set of rings, oil seals, and cylinder gasket delete. Dual port muffler with a bit of opening up on the inside. Advanced timing by about a third of the woodruff key. New adjustable walbro hd15 in place of the hd17. Time to pull the rope. Didn’t have my hopes too high but holy crap this dude took off. A bit of carb adjusting and this is one impressive machine! It lopes like a dragster and throttle response is amazing. The only thing I’m upset about is that I didn’t take pictures throughout the build. I am hooked folks.