blocking the air intake with tape of partially pull the choke ,,,,,,,,,both gave same effect,,,,,,,,,,but if all the mod are executed properlly then you will not need any such thing ,,,,,,,,,,,i never block the air of my 2.5 kw generator ,,,,,,,,and in 6.5 kw i do block for one day only and very soon i realize that its worth to leave it open,,,,,,,,,,and its working perfectelly ,,,,,,,starting on first attempt with in 5 seconds,,,,,,,,