Originally Posted by g-wan
well im done with my novamega sx21 evo5 using caster engine p/s,as its very tight on compression,since our lhs dont carry out novamega part or special order for the liner for 21 engine,so i try to make order from friend in beijing as for caster p/s,even my ninja mr21 using caster p/s..work well on cheap budget
Caster pistons does tell me nothing.....
Microcasted or CNC pistons does only say about the production process and nothing about the alloy and the specs. It is just advertising, giving you meaningless info you realy do not need or understand but you will use it to make your choice.
A piston is a piston and if the piston has a short life or it shatters in pieces then a wrong alloy is used but it has noting to do with the production process (with the idea the production is OK)
Regarding Ninja/GRP, yes, I did fit one set into an old Nova SX21 crankcase and it works just fine. The only thing is to enlarge the 4mm hole for the piston pin on a R7 rod to 4.2mm.