Hello Can anyone tell me what the diameter of a 143cc Scorpa piston is please, or if that isnt possible the diameter of a standard 125 piston Thanks John

Std 125 = Bore X Stroke 54 x 54 mm

Thanks Andy , I shall measure up and see what the wear limits are. Ive stripped the carb and it has the larger pilot jet fitted etc but the round plastic I think its some sort of baffle was lying in the bottom of the float chamber and when I fit it to the main jet it just slides up and down do you know if it is held some how or even which way up it goes as its slightly umbrella shape. Thanks for the previous answer john.