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Hi, I have a 28mm OKO carb. It does not have a power jet on the inlet side of the carb but for some reason it has a brass spigot mounted on top of the rear portion of the carb outlet that faces the head adjacent to the choke. This brass spigot goes through to a small jet on the outlet side of...

I have a Zongschen 140 and am thinking of fitting an inductive tachometer. What I need to know is if the spark plug fires every second revolution of the crankshaft as is normal on a four stroke or if it actually fires every revolution of the crankshaft meaning there is a wasted spark. Any...

Hi All, I have an OKO 26 on a Zonschen 140cc it has a 36 pilot and a 100 main as supplied. It runs well right through the rev range but seems impossible to get to idle properly. Regardless of the pilot jet fitted (have tried everything from 36 through to 48). I get it to idle properly then...