Hyway POP UP piston kit for Stihl MS661

[Dave86]

Have any of you used a Hyway pop up piston? How did it work out for you?

 

[Sawdust Man]

Not in a 660....but I recently put one it a husky 357xp, it gave me about 20 psi increase over oem, (both without base gasket). I have not ran it enough yet to know much about preference, but the quality looked pretty nice to me.
Sorry if this is worthless info being it's not a 066/660.

 

[Dave86]

Thank you.

 

[ammoaddict]

I have one in a 660 clone I built. It seems to be of decent quality. I can't remember what the compression was but it's hard to pull over without the decomp. I don't use it alot but I have used it several times and it runs very strong.

 

[Dave86]

I have one in a 660 clone I built. It seems to be of decent quality. I can't remember what the compression was but it's hard to pull over without the decomp. I don't use it alot but I have used it several times and it runs very strong.

Thank you

 

[sawmill sam]

Have any of you used a Hyway pop up piston? How did it work out for you?

I have used 3 of them in my ms661's and ms460. I DID NOT delete the base gasket, replaced them with new gaskets.
They all run great so far after 5-10 tanks of fuel. I would recommend.