BZM clutch wont work on a chinker. they dont have enough power

it sounds awfully like bad fuel or bad tuning

drop the needle (by moving the cir-clip on it all the way to the top.

run 40:1 petrol/oil mix, use a decnet synthetic motorcycle oil (not lawn mower stuff)

i use 40:1 ELF or Repsol into 98 BP ultimate.
needle right down (they dont clear the jet all the way on a daytona so dropping them helps to run them a bit leaner)

cheers
tom