Stihl MS231 big bore cylinder

[Shed_7]

• #1

Hi, just got hold of a 2011 MS231, not necessarily everyone’s favourite but it looks alright for periodic home use. From what I can gather this is 41.5mm bore, capacity 40.6cc (possible 42mm/42.6cc on later saws). As there is some piston wear I would like to fit a 44mm big bore (MS251) cylinder to it. Is it just a matter of sourcing a 4-bolt manifold and no other changes? Thanks

[Bob_z_l]

There are probably better people to answer this......

but I replaced the whole engine in my 023 with a Farmertec pattern part 025 motor to get the uplift in power. I had heat siezed the 023 and ruined the little end bearing at the same time.
Not that much of an improvement but for me, it was the cheapest way to save what was going to be a scrapper.

 

And an occasional saw , not relied on to do loads of work.

 

[bmp01]

On 18/03/2020 at 12:01, Bob_z_l said:

There are probably better people to answer this......

but I replaced the whole engine in my 023 with a Farmertec pattern part 025 motor to get the uplift in power. I had heat siezed the 023 and ruined the little end bearing at the same time.
Not that much of an improvement but for me, it was the cheapest way to save what was going to be a scrapper.

 

And an occasional saw , not relied on to do loads of work.

 

I did this too, for a big end failure engine. Not the best quality maybe, strangely the clone engine seemed to vibrate a lot more - I'm guessing they don't have the crank balance weights quite right ....