661C crankshaft interchange

[Phill3003]

Can any one tell me if a regular old 660 crankshaft will interchange with a 661-c i have one I tore apart. PC looks great it after getting the jug off i found the lower rod bearing is burnt blue and cumming apart. I was also wondering if any one has adapted a carb to this model saw yet thank you.

 

[Phill3003]

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[Stihlkillstrees]

A friend and I were chatting about this very crank swap in reverse order and I believe he said the 661 crank was wider...or vice versa I'll have to check.

 

[DND 9000]

No, they don`t interchange, the part numbers and stroke are different.

 

[jb-chainsaws]

Damn that's a bummer, I feel for you! I'm betting a new one is going to be ridiculous

 

[Phill3003]

it is a costumers it may be for sale for parts soon.

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[Stihlkillstrees]

Wow, not sure how I forgot to mention the 661 stroke is 38mm and 660 is 40mm. My buddy and I were talking about some custom stuff.

 

[jb-chainsaws]

I'd love to know why they shortened the stroke!

 

[Phill3003]

wonder if rods are same length maybe cut some serious squish on it

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[Stihlkillstrees]

I believe both cranks in a line just arent close enough to swap.

 

[mdavlee]

If they fit width wise and the flywheels and clutch stuff work I'd love to try one. 99cc.

 

[Stihlkillstrees]

I believe the clutch threads are bigger on the 661

 

[Phill3003]

guess it's time to split the case and compare and contrast.

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[Stihlkillstrees]

My buddy almost did it yesterday lol, pancaked his 661. But he got lucky and it's not a total loss, smoked his new 36" bar though too.