What's on your bench today?

[Mik the Miller]

Pistons in back to front ...

[adw]

Blocked spark arrestor or muffler, ring stuck in, air filter blocked.

[pleasant]

43 minutes ago, Mik the Miller said:

Pistons in back to front ...

Nope...it's stock as it left the factory.

[pleasant]

13 minutes ago, adw said:

Blocked spark arrestor or muffler, ring stuck in, air filter blocked.

Nearly there ADW.........I was going to give you the house point, but not exact enough for one of those!

[adw]

If the air filter is full of fuel then we have blow back, so it has to be the exhaust gas cannot escape? Not to familiar with Stihl so where does the air flow into the filter area? maybe we have something blocking it?

[bmp01]

Sounds like blocked exhaust to me (adw there first).

But not high use .... exhaust blocked with some creatures nest or something ?

 

Edit :  could be insufficient air going in if its going rich (smoking) with open throttle but filters ok so blocked air inlet, ie before the filter.

Edited June 8, 2023 by bmp01

[openspaceman]

42 minutes ago, pleasant said:

Nearly there ADW.........I was going to give you the house point, but not exact enough for one of those!

Mouse nest in silencer then?

[Craigb]

Leak test on 346 rebuild went well. 

[spudulike]

On the FS360, it sounds like the air filter is getting saturated in fuel/oil mix, this on an older machine, is possibly caused by a broken or significantly worn piston skirts causing blow-by from the crankcase back through the carb when the piston drops down on the power stroke.

I suspect the fix may have been something much more simple so blocked exhaust/spark arrestor is possible as is carboned up exhaust port.

[spudulike]

12 minutes ago, Craigb said:

Leak test on 346 rebuild went well. 

Good work getting one of these sealed. The inlet manifold and crank seals on the clutch side are usually difficult on these machines.