Ok all bantam race bike's are a bit different! but generally a lots of the moving parts have a similar
service check or routine and milage count? - the other option of course is keep racing it until something breaks!! then change it if your motor is not completly ruined!!
Here is a Schedule for my 125 bantam i would expect a lower reving motor to have longer services(?)
After Every Meeting -
Check piston for cracks (replace if cracked)
Check ring gap in bore (replace if more than .030")
Check primary chain (replace if any rollers missing)
Replace gearbox/clutch oil
Inspect clutch plates (replace plate if to thin)
Mid-Season-
Replace caged roller small end bearing
Add an extra clutch spring (was 6 now 7)
End-season (or Pre-season)
Strip check clean - gears selectors, crank etc
Check Bore wear (hone if required replace grade size piston)
Replace - main bearings/seals. gearbox bearings/bush. primary chain. 6 new clutch springs.
Every 1000 to 1200 approx 3 seasons?
Replace Con-rod assy (rod, big end, crankpin and shims)
What do others do?
Regards Mike