Help wanted,

my dt ticks over too high. Have set the static ignition timing. After a certain point, decreasing/ taking out the tickover screw makes no difference; screwing it in does increase the idle speed though. Have set the air screw. The jet needle is the standard 3 notches down from the top. The carb is a 3U500, ie model 4J4. I have no air filter element (but I do have an airbox fitted) I'm wondering if I have a dodgey aftermarket cable as my oil pump markings are well out. The identification markings on the metal pulley are 3JO. There are a few markings on the pulley itself, but with the cable removed the dot and dash markings line up with the pin on the pulley, ie no throttle. Just wondering if this is right. The manual is not clear.

Any ideas would be most appreciated .

Thanks

Having no filter will affect carburation, I think you should fit one or it will run lean, in the mean time try richening by screwing in the mixture screw, try 1/2 a turn out from closed for example but get an air filter fitted.