Getting ready to bore and freshen up my old quadrunner 4x4,which is recommended for relpacement piston kit,oem or weisco.

 

oem is cast crap,weisco is forged alum.

 

Ever wonder why manufacturer's uses cast pistons? It's cuz they are the best.
Wiseco's are lighter but my guess is that your not doing 10k+ revs and need a lighter piston. Wiseco's also need more clearance cuz they swell like my belly on a beer night.
Cast pistons crack more easy on high reving engines.
If you want dependability, you want cast (OEM or Pro-X).

 

If you want to pretty much rebuild it and forget about it go cast, or oem. Save weisco's for the 2 strokes.

 

weisco all the way.

 

I try to go oem for reliability, weisco for when oem's are not available or for specialty needs.
If your not racing or at a bore that you can't get them, I would go oem.