Can any one tell me why, that when my 748 is on tick over it seems to miss a beat now and then almost stopping. For example, I put it on the padock stand, start it up and get it warm, it runs fine around 1,200 then for no reason, just as you turn you back it dies a split second totaly and then carries on fine for another 5 mins or so , and then does it again. There is no coughing or splutering, it just dies then carrys on, it has 45mm termis with a JHP air filter and chip. there are no problems when riding, as most of the time am well above 1,200 rpm.