Quote:
Originally Posted by john hall
So it has spark, fuel, air, and the exhaust is not plugged--correct? I forget, compression test results? This brings timing front and center does it not? Also--here is one that drives folks nut on a 2 cycle---bad crank seals. I had it to happen on an OLD 041AV Stihl chainsaw. Buddy loaned me his "test kit", but still think I had to modify/make a block off plate. Can't remember but I believe I plugged the exhaust and pressurized the intake, then later pulled vacuum on intake? I've got a really old Echo issued vacuum tester that I used in addition to my friends. I wound up tearing that saw all the way down---everybody should do that once. I don't think there was anything left bolted together except the carb (I had already put a kit in that). There is a reason every lawnmower shop has a big pile of 2 cycle products in the scrap heap.
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Has spark, fuel, air and clear exhaust. Compression with 4 pulls was 120.
John, that is honestly my next step and it won't take much its a tiny little engine. I don't see how timing can be off, with not having any valves in the engine. So, next is a complete tear down, which may take 30 mins to do to see if there are any signs, then I plan on a complete seal rebuild etc. After that I may just give up on the freebie, but all the signs are there that it should run just fine.
Bore scope does not show any issues with scoring on the wall either.