Over-revving when hot but only in gear??

Hi guy's i'm in need of some advise if somebody could help.I own i cg10 micra(1994)with a dizzy and have done some mods on it till now.
1. 1.3 cams
2. skimmed head(for compression)
3. port head(for better flow)
Everything went well and fired it up worked almost fine..
When cold it tends to not-rev easily(as if it miss fires) but after a minute everything goes away and when the engine is in prime temperature when i get the car in gear the revs go up abit..
Huh???
Any ideas??
 
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