Garry here's were you've been not seen you on any sites in yrs, another full on tune up again I see.
I've still got my x1 and rd50m infact last week we did the Eagle moped run my X1 seized up now needs a rebore.
My rd50m s nearly Std bike std carb cylinder and a cs5 exhaust pipe fitted.
It pulls hard up to 52mph nice quiet exhaust note and induction noise and will cruise at this speed at 7500rpm.
It's been over 60mph before on a Brighton run but it's a bike ive set up to be mild not Revvie pulls from 4000 to 7500 rpm lots of torque.
Had a rd50m at 16 as first legal moped it was messed about with to get best performance from it back then.
20mm carb from a yz50 and yz50 copy expansion chamber me n Dad built.
We basically copied yz50 spec on a rd barrel as yz cylinder will not fit on.
It would do 60mph and would wheelie well 😂 moped wheelies