I’m wondering how long a Chinese saw will last.
Good question. I have a 72SX thing here which I got for absolute peanuts. Had only run it once (before yesterday) and that was just to see whether it would fire and drive the chain round the bar.
Well yesterday I got to wondering what was inside the things so I pulled it down.
I was pleased to find way fewer weirdnesses than I had expected, but I did find a couple. lolol
*The first was that the '72' in the model name has nothing to do with the capacity. Measured the bore and stroke and calculated that it's actually 58cc.
*Wiring routing to the kill switch was a bit silly and would have caused trouble later down the road. Re-routed.
*Base gasket was sealing but just wasn't quite right (bad assembly). Cut a new one.
*Stud holding the air-filter down had been bodged. The stud had been inserted on a silly angle to allow more clearance between the air-filter and sparker. The silly angle did allow better clearance but caused the air-filter to have poor seal. Drilled, helicoiled and remounted correctly. Deformed the corrugated paper filter slightly to allow clearance.
The last weirdness - that filter stud - would have lead to an amount of unfiltered air to enter system. Very, very, very silly.
I was pleasantly surprised to find that everything else seermed well fitted, quite well designed, well machined and well assembled. No bolts were stripped or cross-threaded (apart from that aforementioned stud) and were correct lengths. Carb linkages were properly adjusted as was the igniter air gap. Apart from that base gasket the others were all OK and look to seal well.
The thing had, literally, lots of rough edges on the plastic covers which I sanded off. Compression is good (twin rings), crank seals feel good (though I didn't pressure test them) and it starts as easily as any Husky.
My recommendation to anyone buying one of these things is to pull it down and have a good look to make sure all is as it should be.
Added later, after beer; But the ultimate silliness of this thing is that it came with a 22" .325 bar and chain!!! On a 58cc machine? Have since ordered an 18" 3/8 bar and chains and rim sprockets.