Hi guys please help me iv got a dt 125 1999 and its got a running issue theres 2 issues i think 1stly the bike would tick over but when i ride it i get 300 meters then bike cuts out almost asif being starved of fuel so i cleaned carb today and put back together now bike only runs with choke on but its revving its knackers off i did take inlet off and toon reed valves out aswell can any1 help me

sounds like either

you have an air leak somewhere

or

The throttle slide isnt closing properly

turn the slide around sounds like you have it in backwards

Do you mean by throttle slide the end of the rev cable because thats seated fully in the carb and is it possible put reed valves in upside down

The inlet manifold is tight on the carb could the seal between the reed valve, engine and inlet cause this problem

the slide is inside of the carb, it's what lets air into the engine

The inlet manifold is tight on the carb could the seal between the reed valve, engine and inlet cause this problem

all seals have to be good ones or you'll have an air leak

Is that the block that has a spring above it that screws into carb and moves up and down when you twist throttle

Iv only had inlet side apart on bike so ill check them is it possible to fit reed valve upside down

Is that the block that has a spring above it that screws into carb and moves up and down when you twist throttle

Yeh the slide " and there shud be a rubber gasket on the carb top ,