clemsonfor
Minister of Fire
I looked the 290 is 54cc the 390 I know is 64 and the 310 is somewhere between 59 or 61?? I think it has a decomp valve.
Well, I was first caller, picked this up for $150. Runs, compression good, the plastic switch for choke and run is broke.
A couple bucks, few parts, and she'll be good as new.
Anybody have one of these would like to comment, suggestions?
I'll PM you when I tear it apart if you don't mind. I don't think I'm gonna do it any time real soon. I just bought a whole top end big bore kit for my 441 magnum, I gotta get that up first. That saw "is" only three years old, I'm owner # 2 and I knew the original owner of it well. He flooded it out, took the plug out, and stripped the plug out putting it back in. Handed me the saw and said, here's a saw for you! He went back out and bought a new one.Considering the purchase price, you still have room to replace the whole engine and break even. I'd start by measuring the cylinder to see what you really have. The main difference between the MS290/310/390 is the bore diameter. Crankshaft and connecting rod are the same. You can reuse them if they pass inspection.
MS290 is 46 mm bore
MS390 is 49 mm bore
The 310 is somewhere in between.
I would not put this saw back together as a MS290. 390 or bust! If you order a 390 top end, you can simply plug the port for the decomp valve since you don't have the plastics to accommodate it.
I did a 390 with an aftermarket kit not too long ago, came out great!
Not at all.I'll PM you when I tear it apart if you don't mind.
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