Contrary to popular believe RBG 20's are a very versatile kit, yes they are considered to be high revving, thrash about kit, however they are as all 2 stroke very dependent on the type of exhaust system which in my experience can be tailored to alter the power delivery of the RB20 to a more subtle touring type motor.
We (Tem DSC/Darlington SC) currently run two RB20 kitted motors in the LCGB production class along with around 20+ other competitors and to date there has been no failures relating to the kit the kit, they are able to run possibly the tallest gearing on the BSSO grid (4.8 and sometimes over) and rev to around 8400/8800 with the pipe used for class-(Franspeed Race) and produce good torque in relation to rpm and power spread. So with this gearing at around 7000 rpm, road speed is around 70mph.
The RB20 gives a very smooth power delivery mainly due to the 116mm conrod /low compression height piston used and fitted with something like a Franspeed RB touring pipe or even the race can in fact make a very good touring engine.
Good Luck!
Scotty-DSC
PS- her's some footage of our production class RB20's, if you listen to the rpm you should hear how well they pull from low RPM, they also handle the relatively large gap ratio wise of the Indian GP200 gearbox which is a requirement of the class regs, this was at Anglesey race circuit which has some pretty steep inclines up which all the production class RB's pulled very well.
https://www.youtube.com/watch?v=f40yvfg ... ture=share