Does any one know the carburator specs for a 1992 honda Z50 dirt bike?

[Imsobusy]

We bought this for my son and I would like to tune it up but having trouble with the carb. Also specs on the  spark plug gap. Any tune up specs would be appreciated

[jensenracing77]

the needle on the cable is to be in the middle grove. the float is not adjustable, if it leaks replace it. the mixture screw you will have to play with. remember this screw is only an idle mixture screw, anything past idle and the screw has no affect. the best i can give you on this is put it in first gear and go real fast then let all the way off the gas, if it backfires during deceleration you need to turn the screw out one half turn then repeat process. if you find the screw more than 4 turns out you may have to put one size bigger pilot jet in it. as for the spark plug just buy a new one for $2.50 they are preset from ngk. i believe it is a CR7HS-A.

[RobertP]

Carb specs: float level 12.7mm, main jet #58, slow jet #35, jet needle clip position 2nd groove, idle speed 1700 rpm, air screw initial setting 1 1/4 turns out.