420A JE Pistons for a 420a

[wyv344]

I'm having trouble determining the piston orientation for my forged pistons for my 420a, I see the JE logo on the bottom of the pistons there isn't any arrow or any mark that indicates which way they should facing

 

[97egl]

Normally the valve reliefs for the exhaust are smaller and intake reliefs are larger.

 

[DSMPT]

In case if you see no marking such as arrow/dot or IN/EX, and if the pistons are symmetrical which pistons have the same size/design skirt and valve pockets on both side, usually the side that has the "JE" logo is exhaust side.

 

[BLACK'98DSM]

The JE pistons are symmetrical besides the markings on bottom. Orientation does not matter but I like to install them all the same way.

 

[DSMPT]

Here is JE's guide for future reference.

A Reference Guide To JE Powersports Piston And Ring Markings | JE Pistons

Powersports is an industry full of a wide variety of machines, from dirt bikes, to UTVs, to personal watercraft. Each engine in each category is different,

auto.jepistons.com

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