Jonsered 2071 crank compatability

[BonScott46]

Pulled down my low hour 2071 and found this.

Does the later model 372 crank swap in or do I need to change the PTO side case half as well?

 

[XP_Slinger]

Pulled down my low hour 2071 and found this.
View attachment 228593 View attachment 228594
Does the later model 372 crank swap in or do I need to change the PTO side case half as well?

I believe it’s a direct swap. Although I fail to see why the loss of finish on the connecting rod warrants a crank change. What am I missing?

 

[BonScott46]

I believe it’s a direct swap. Although I fail to see why the loss of finish on the connecting rod warrants a crank change. What am I missing?

Is it supposed to narrow like that? It starts narrowing where the finish is missing. I have never seen a crank like that but i have not seen a lot of cranks either.

 

[XP_Slinger]

Is it supposed to narrow like that?

Yes sir

 

[BonScott46]

Yes sir

Well that is good news. There was quite a bit of carbon/sooty build up in the cases, on the piston and in the combustion chamber. When I bought this saw the piston was very clean and I have only run max ten tanks of very clean burning fuel through it. Should i give it a polish and let it ride then?

 

[XP_Slinger]

Well that is good news. There was quite a bit of carbon/sooty build up in the cases, on the piston and in the combustion chamber. When I bought this saw the piston was very clean and I have only run max ten tanks of very clean burning fuel through it. Should i give it a polish and let it ride then?

I would, nothing wrong with that con rod at all. I just had my 372 apart not long ago but don’t have any pics of the con rod. I know it looked exactly like yours

 

[BonScott46]

I would, nothing wrong with that con rod at all.

Great, thanks for the help!

 

[XP_Slinger]

Great, thanks for the help!

No problem...happy cutting

 

[BonScott46]

And she is back together with a 268 popup.

 

[XP_Slinger]

And she is back together with a 268 popup.
View attachment 228614 View attachment 228615

Oh really...What's the gain with using a 268 piston?? Lighter?? Never seen that trick before

 

[BonScott46]

Oh really...What's the gain with using a 268 piston?? Lighter?? Never seen that trick before

More compression, more intake timing, lighter piston and you can use a stock gasket.

 

[XP_Slinger]

More compression, more intake timing, lighter piston and you can use a stock gasket.

Nice. Thanks for sharing