Meteor piston arrow direction

[421Altered]

i know that this has been answered a thousand times here, but, I can't find the answer when I do a search.  Which direction does the arrow on Meteor pistons go on a Stihl 038 Magnum?  Its been a while since I posted, and I can't find my original thread either.  I'm finally getting around to putting together my Stihl 038 Magnum 2.

[ZeroJunk]

Arrow toward exhaust.

[421Altered]

Thanks!

[421Altered]

I've got another question.  How do you "break in" a chainsaw that one has rebuilt with a Meteor piston, caber rings, and a used Stihl cylinder.  The cylinder appears in good shape.  Also, how do you get the built up carbon out of the top of the cylinder?

[sawguy21]

Set the mix a little rich for the first few tankfuls and after letting it warm up run it like you stole it. Once broken in you can lean it out a tich for more power but don't overdo it. If properly tuned the carbon will burn off.

[421Altered]

Thanks Sawguy, that's what I needed to know!

[barbender]

When break stuff in, the only thing I avoid is constant rpms and constant loads. With a chainsaw, normal operating accomplished that anyhow as long as you're not milling.

[421Altered]

Thanks Barbender!

[thedoublejranch]

What saw guy said. Very important for that warm up. Allows piston to absorb heat and swell along with cylinder, more critical on a forged piston as clearances are greater. This allows piston and cylinder to warm up nice an evenly.