I have a owners manual which I wish to retain.
Masport N.Z Part No. AR50125.
Champion J8 plug gap .025 inches
Oil SAE 30 (1 pint)
Oil for working head Shell Dentax C
Carb adj initial to start
Close needle valve gently (lower leaf headed) clockwise
then open one and 1/2 turns counter clockwise.
Close idle valve (faces to rear) then open 1/2 to 3/4 of turn
When warm and engine running full speed turn needle valve in till it misses and then out till it runs uneven. Then turn back to mid point between the two.
With engine running at idle adjust idle screw (faces upward @ 45 degrees) to fast idle (1750rpm) readjust idle valve till engine runs smooth. Reset idle screw to 1750rpm.
Engine should now accelerate smoothly. If not adjust carb to a slightly richer mixture
Maurice Hodgson, July 2007