what to do with a like new MS390 thats got no compression???

[jd548esco72]

my uncle dropped by today with a clean like new MS390 thats got no compression at all , won't even fart--lol

normally i toss these clam-shell stihls. but this one is so new like i'm having second thoughts. like maybe a hutzle shortblock? i haven't looked at the bottom end for excessive slack yet--

do these things have any value at all? any market for the parts??

 

[LoveStihlQuality]

I had same situation. I bought the complete NWP shortblock on sale at Baileys. I've seen some with mild muffler mods.

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[jd548esco72]

I had same situation. I bought the complete NWP shortblock on sale at Baileys. I've seen some with mild muffler mods.

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how did the balies lower end work out?

and the time i tossed the MS 290s there were no inexpensive knock off shortblocks for these things.

 

[Bedford T]

A firewood saw for $80 bolt on, hard to beat.
http://m.huztl.net/Stihl-029-MS90-0...1216-1127-030-0402-1127-021-2500-p368071.html

 

[Leerod83]

Clean it up and put a meteor piston in it if possible. I did however just put a hutzl 390 motor on a 290 that I widened the ports on,muffler modded and did a timing advance on. Seems like it's got some nutz but I haven't run it much. I figured the OEM cylinder would be better than Aftermarket is why I said clean it up if possible.I will tell you if you go hutzl the oil pump bolts and ground are 4mm not the self tapping type Stihl uses.

 

[HarleyT]

Why wouldn't you remove the muffler and take a peek? Also make sure the decompression valve isn't bad.

 

[LoveStihlQuality]

how did the balies lower end work out?

and the time i tossed the MS 290s there were no inexpensive knock off shortblocks for these things.

Easy. I didn't know history. Complete came with all bearings seals and all installed. Cheaper alternatives for sure. Time saver was worth it.

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[a. palmer jr.]

Nobody around here ever tosses a 390 just because it doesn't have compression. We usually just put a new top end on them and check for air leaks and put it back into service...I always put new crank seals on it while I have the engine out.