1981-1984 Official Honda ATC250R Shop Manual, Page 217Get this manual
ATe 250R
'83 ATC250R ADDENDUM
Carburetor
Type Venturi dia Setting mark Float level Air screw opening Idle speed Jet needle Throttle lever free play
Piston valve 30 mm (1.18 in) PE 30A 20 mm (0.79 in) turns out 1,300 150 rpm 3rd groove from top 3-8 mm (18-14 in) Wet multiplate type 5Speed, constant mesh 3.250 1.900 1.591 1.240 1.000 0.839 3.231 Left foot operated return system, 1N2-3-45 COl 17 BTDC2,000 rpm 14 BTDC9,000 rpm Primary kickstarter 12V 73 W7,600 rpm NGK BR8ES Champion RN-3-C 0.7-0.8 mm (0.028-0.031 in) 12V 60W60W 12V 5W Full retard II III IV V