lent it to a mate he ajusted 2 sprung screws in side of carb now cant start.worked well befor.can any body tell me how far in or out they should go thanks

miko, July 2008

Could anyone tell me the mixture and the spark plug gap please

John Hyatt, July 2019

petrol primer has got a small leak, can this be repaired/replaced

mick/st albans, June 2010

Further to my earlier answer, I have set the carb on the machine I was working on to give a maximum no load spead (with about four inches of line showing from the head, more than enough I think) of 9000 rpm.

James, August 2008

Try one to one and a half turns out from fully in. Carry out fine settings from there. You might also check the throttle stop screw is about half to one turn in from first contact with the throttle. Adjust idle mixture screw ( the one nearest the engine ) slowly one way then the other to get a reliable engine tickover and good pick up when the throttle is opened. The high speed mixture screw ( the one furthest from the engine ) really needs setting with the aid of a tachometer to give a maximum engine speed of 12500 rpm ( I think that is the correct speed for this model, but not certain ). The engine should at any rate be just "four -stroking" at full no load throttle.
I am about to repair one of these myself, so if you want to know how I get on with the set up, let me know.
Good luck.
I wonder why your friend tampered with the carb in the first place!!

James, August 2008