81 Harley Piston

sXeMike

We're redoing the top end on an 81 3-wheeler....here's the piston we pulled out.


It has EX(I'm assuming this means exhaust) 020 and C stamped on it....and only 2 rings. I thought it was supposed to have 3 rings.

I need to order a new piston and rings but I'm not sure if it's 20 over or something else. Anyone know? The can seems to be fine.

BGW

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bvilleharleycart

I would guess someone has bored it out. Does your cylinder have a stamp on it? I just changed the one in our '76 and it didn't have that on it. Best way would be to measure it.

sXeMike

I'm pretty sure it's been bored. I just don't know how much. Do you know what the bore is supposed to be? No stamp on the cylinder that I could find.

Olman

From my experience, the 020 on the piston means it has been bored .020 oversize.

sXeMike

That's what I thought too but this one only has 2 rings. Every other Harley piston that I've seen has 3.

Craigs carts

.020 over and the ex is exhaust side. yes the new pistons will only have two rings.

sXeMike

Thanks!..now where's the best place to buy a piston, rings and gaskets?

so far, the best deal I can find is ~$65
Do any of the site sponsors have Harley parts?