My friend installed a Hyway popup piston in his 261C

[drf256]

One other point.

Meteors don’t have a lot of “rib” on the side either. Run them for a while and the valleys get some carbon while the peaks stay clean. The contrast that occurs makes it more apparent.

Ever see a new oem piston look a bit rubbed after a build and then “clean up”? I certainly have. The valleys fill and the small rubs on the peaks lose their contrast. The small rubs become invisible, as they are solely on the peaks of the machine marks.

There is a good chance that some machine marks become apparent on the Hyway slug after use.

 

[CR888]

The bevel at the bottom of the piston is there to direct oil to the cylinder wall.

 

[RI Chevy]

Just to add to thread. A Meteor piston for 261.

 

[RI Chevy]

And the pin.

 

[Stihlsmoking]

Here is new Oem 261.

 

[RI Chevy]

New is nice!!!

 

[Stihlsmoking]

Was looking at first pictures and seen a spot so went and looked again.
What does everyone think of this tiny bad spot on OEM piston.

 

[Finnrpm]

Flaw on a OEM part, expensive or not, has always pissed me more than flaw on a AM part. That's what you pay for, flawless quality, right??

 

[smokey7]

That tiney little casting imperfection is meaningless to me. I get why someone would expect perfection but i honestly dont think it would make any difference atall. If one was to look at every part under magnification of a oem saw im sure you would find several casting errors. Keep in mind guys its a saw not a spaceship lol. If we forced them to perfection that same saw would double in cost in a hurry.

 

[blsnelling]

That tiny pore is completely inconsequential.

 

[Stihlsmoking]

If one was to look at every part under magnification of a oem saw im sure you would find several casting errors.

That tiny pore is completely inconsequential.

Thanks guys I didn’t actually see it taking pictures but seen it posting the pictures. I didn’t figure it’d make any difference but wasn’t sure with heating and cooling of piston. Thanks

 

[kfd518]

That’s nearly perfect. I bet 10 off the base gives you 220.

What’s the compression on a stocker? Anyone know?

My stocker that was bought used is 160

 

[Finnrpm]

Just removed topend from my 2010 ms261 and found this.......

Removed transfer from the cylinder intake side....

Don't know the reason, but debris or water could be the reason for this scoring.
Will go with oem piston..... only 98 euros.....
RV

 

[drf256]

For my own saw, I’d totally clean up and run that piston and save the $.

 

[Bigmac]

Just removed topend from my 2010 ms261 and found this.......
View attachment 202965 View attachment 202966 View attachment 202967 View attachment 202968
Removed transfer from the cylinder intake side....
View attachment 202969
Don't know the reason, but debris or water could be the reason for this scoring.
Will go with oem piston..... only 98 euros.....
RV

That piston crown looks like an ink blot test! Lol