Porting the Stihl MS250 for the second time due to catastrophic failure. I modified the piston on the mill and ported the cylinder much the same as the previous. I used a Little Red Barn Pop-up piston that I found on Ebay as well as a Cylinder from Ebay or Amazon (I can't recall; I've had it a year or two).
The Timing numbers on this saw are as-follows:
PREVIOUS VERSON
Exhaust 98/ 164 total open
Intake 88/ 176 total open
Xfers (not noted)
Squish .042
Ign Timing Advanced @3 Deg
Piston 61.58 Gr
Current version
Exhaust 98.5 / 163 total open
Intake 83 / 166 Total Open
Primary Xfer 120 (Moved 1 deg by angling upward)
Second Xfer 121 (Untouched)
Squish .038
Ign Timing Advanced @3 Deg
Piston 57.48 Gr
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I don't waste much of anything... especially money. If there is a way to do something cheaper or easier, I'm searching for it.
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