So I'm curious about getting a 300RR, but I confess I'm a bit put off by the weight difference between it and something like the TRS. If the Cota claimed dry weight is accurate, you're looking at about a 15lb weight difference. From anyone that has a a modern 2 stroke and a 300RR, or has switched one way or the other, do you feel like the extra weight is noticeable? Offset by other benefits? Or a non issue?

Depends on what type of rider/course you do. If your a hopper & bouncer type the weight is quite noticeable after a days competing. But if you ride old school style,then the difference is barely noticeable imo.

Ok, that's about what I expected. Thanks!

In addition to the static weight, you also have to take into account that four strokes feel heavier to ride than two strokes. This is because the heavier rotating mass in a 4T engine creates a higher moment of inertia than the lighter rotating components in a 2T engine. The consequence of this is the bike requires more force to deflect it from its current path [this can work for against you in different situations] but makes the bike feel heavier to move or turn.