ms170 loose bearing

[Blairito]

I rebuilt my ms170 with a farmer tech 38mm cylinder and piston, new crank and bearings, seals eat, i used the poem bottom clamshell , ran the saw for a few weeks, it ran great, then It was running erratic and would bog, i noticed some scoring on the flywheel, i then could feel up and down play from the flywheel , I thought it was the bearing, upon tearing it down the bearing is fine, the play is it the clamshell bearing retainer, seems like the bearing either spun or the tolerances are off, not sure what to do here.
its my beater saw, adjustable carb, muffler mod. but I like having a light saw to use
any input or experience with the issue would be appreceiated

 

[67L36Driver]

I just drop in the Farmertec complete 180 engine in them.
Bim Bam! Thank you ma’am!

 

[Blairito]

everything was farmertec except the bottom clam and circlips.
so i should just replace the cylinder then

 

[s sidewall]

Replace the bottom, been cheaper to have replaced complete engine, 180 for around $45.

Steve, Samsung On5 using Tapatalk

 

[a. palmer jr.]

I usually use the Stihl crankshaft and rod, bearings and bottom plate and replace about everything else..I just feel like the Stihl crankshaft and bearings would be better than AM stuff.

 

[s sidewall]

The tolerance between factory bottom and farmertec cylinder in the bearing pocket maybe the problem, not matched the same.

Steve, Samsung On5 using Tapatalk

 

[Blairito]

i have decided to go back to the factory 37mm cylinder, i ordered new rings and seals, plus a flywheel that was damaged due to the movement, it was in great shape before i put on the 38mm

 

[a. palmer jr.]

I guess you've already noticed that the coil on the 017 and 018 are different. Stihl made a change in the middle of the 017 run, changed several parts.

 

[Blairito]

I wasn't aware

 

[67L36Driver]

I guess you've already noticed that the coil on the 017 and 018 are different. Stihl made a change in the middle of the 017 run, changed several parts.

That tidbit got me on the last ‘ box-o-parts’ I put together.[emoji90]

 

[a. palmer jr.]

The 017 module is bigger and will not mount to the 018 cylinder. They changed the mounting slightly on the cylinder so you'd have to buy the smaller module if you make the change over to an 018. Of course if you have the later 017 you're all set.