Could be choke but would like second opinion!

I own a Skyjet F5 (sports style bike) which is fitted with a 70s era copy honda cg125 k series engine, funnily enough just like the real thing as i used to have one and they were vibration kings too:riding:
Any hows its got one issue at the moment that im pretty sure is choke related but before taking tank off etc id thought id better check, its running slightly fast on tick over then when im riding after its warmed up,, it wont rev and will go quicker on 1/2 throttle than when twisted fully open!

I have just refitted the engine after having to take it out due to snaped exhaust studs and cant remember if i over tightend the choke freeplay adjuster!

Any advice would be fantastic!