hi chaps couldnt resist when i saw the supercharger and thought i ll have some of that and i ll tell you you what my savage flys
my set up was k4.6,3 speed box,52/13 clutch /spur which was great always wheelie n but when i put the super charger on anh tuned it up man it took about 3/4seconds before it changed gear from 1st to 2nd so in the end i had to change the spur/clutch to 47/18 as my mate was getting the arse as his savvy couldnt keep up
now i reckon that the k4.6 engine is 2.9 hp plus the supercharger and i put the new 50% pully on then i must have 4.35 hp which is pretty close to the 5hp twinzilla but without the weight (2 engines + 2 fueltanks) for £150 instead of £350 for the twinzilla well i think its a bargin the ONLY problem is they only give you 1 pully for the 4.6 engine when you really need 2 and these guys want $28 to ship to the UK so make sure you get everything on your first order as spares are cheap but the shippings a stinger