Is this normal piston wear?

E

ezra

Well-known member
what sled ?
looks like odd curved casting marks on piston that cant be from wear.is the other on the same?
the rest looks ok kinda black for the intake side but no scuffs. got a shot of the top?
 
J

jimfsr

New member
black coating is the teflon that comes on some pistons, swirl marks are probably from the "printing" of the tefllon. Don't worry about it, the teflon is designed to wear off anyway. If the top color is fine with good port wash, leave it alone.
 
D

D.B. Cooper

Member
Magnumb said:
I'm not seeing a scuff marks but it does not look normal to me. Sled has 1800 miles on it.


View attachment 37905
Click to expand...

Piston to wall clearance is what mostly matters

.004" to .005" is desired checked PERPENDICULAR to the wrist pin and in the skirt area, approx 1" - 2" BELOW the rings

CAREFULLY place a .004" feeler gauge (then increase thickness) into the port are between cylinder wall & piston skirt and see where you're at
 
G

G

Guest
Run it. My old Artic 800 twin had similar marks and ran forever. The big bore twins scuff easier for some reason but it is harmless.
 
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