hi mate, ive had a few of them probs too, overheating etc,
i got onto msuk as mine is new an told them, he told me to richen lsn, so i did an it cooled the engine right down. in the end i just decided to put it back to factory sets and have yet to see how we get on from there, which will be tommorrow.
if your not sure of factory sets you close the hsn fully an then give it 4 full turns. the lsn you screw it until it sits level with the base plate.