Scratched piston replacement?

GoldenMotor.com

copmagnet80cc

New Member
Jan 7, 2014
84
2
0
Ohio
On my 2 stroke engine while taking a look at the cylinder ive got maybe a centimeter long scratch on the inside of the cylinder. I can just get my fingernail inside of it and im wondering if i should get it replaced.
 

Kioshk

Active Member
Oct 21, 2012
1,152
10
38
Connecticut
piston:cylinder :: foot:shoe

(old SAT word association)

Unless you have a noticeable reduction in compression, you should be OK. Also, if it's outside the combustion chamber, forget about it.

What made you look anyway? Rings OK? If it's new damage, you should make sure the case is clear of debris.
 

GearNut

Active Member
Aug 19, 2009
5,104
11
38
San Diego, Kaliforgnia
Unless it is such a deep gouge that you you can trim your fingernails on it I would not worry about it. Small scratches are not desirable but unfortunately all too common in these engines. They are usually caused by manufacturing debris left inside the engine by the factory. Final inspection/ quality control is still somewhat a mystery to them.

Enjoy riding the engine until she blows, then rebuild it or replace it.
 

rogergendron1

New Member
Sep 18, 2013
882
2
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42
woburn ma
Dude i have ran pistons that looked like i took a rock to the side of the skirt and jugs that looked like i ran 80 grit sand paper down the side together and the motor ran pretty well lol

but yeh unless your going for a high performance race bike dont worry unless the crome os chipping off