Also keep in mind that engines with lower rpm's do not have the same material rods as the faster ones. Novarossi did number them in strength and currently I have seen R2 up to R7.

The R2 is placed in a Basic N21-3T and from own experience I can say it won't last long if you tune up the engine to the performance of the high priced competition models. I have seen R3 and R4 rods in offroads and the R5 and R7 are used in onroads, the R6 is a special model for JP.

Changing rods is cost effective on 600+ dollar priced engines, waiting until it breakes will cost more....

Point taken. :D

I don't really disagree with that since the better Nova rods on short tracks last a LONG time. Changing them every gallon in those conditions is overkill. However, long tracks or non Nova rods need constant replacement or catastrophic failures will result.

thanx to everybody that give a brilliant opininion and supportive comment:)...well i guess...im gonna stick with replacement of con-rod for every1-2 gallon...im an on-road racer...and i always run my engine a little rich...i dont like to tune my engine to the max limit...just nice to get the power then i will be concerntrating on other parts such as clutch system, pinion and spur gear to get race performance...

plus at my LHS i can get him to replace my con-rod and the pin at the sam time :D...it's better isn't it?:D.......thanx guys...;)

Can anyone point me toward a how-to on changing a rod? It's a novarossi if that makes any difference.