Thanks for reply.
I have JR ds 3421 that have 65oz and .18 speed with 4.8 v pack,
i expect more with 6v, around 70 oz and speed .15. What do You think about that or better to by something. Advantage of that is weight ds 3421 is 1oz and 605 is 1.72 oz.
and also I already have them.
Probably, I’ll go to carbon roads and ball bearing linkage that will give me more precision.