Hehe, yeah thanks rod - exactly what i meant.

Amazing how much difference 6 letters makes to context

Being an aussie, my native tounge is metric - so a 168 gram weight reduction in a 4.5kg truck is something along the lines of 3% of the total truck's weight.

If it were weight reduction from the chassis, frankly i wouldnt bother unless i could get something more substantial... but from the driveline, that's a big difference on the rotating mass and a fair bit of load off the motor.

Big difference for a two stroke which doesnt really like load in its lower RPM ranges.