(G) uno fire 1100 foot flat and motor just idles

Ahoy again peoples.


I've now put my whole motor together and she starts no mess no fuss. Only problem is that when I start I have to have my foot flat on the floor and when she takes keep it there until the revs come up. Once I've let go of the accelerator again, I have to do the same thing to get the revs up again. She does idle though.

Any ideas?

Thanks
Stash;)