I'm starting to wonder if the fualt is not the engine and is else where, i've only owned the bike a short while so there are alot of unknowns about it's past maintanence.

When you said about the air temp changing fueling rates! that confused me a little, i understand exactely what you mean but confused with regards to the kev mod being fitted, i thought once you'd found a sweet setting the air temp changes shouldn't cause problems to the setting you had dialed in or am i inderstanding it wrong?