hi guys

my S1 is nearly rebuilt again - thought I'd chucked the big end but turns out to be damage to rear piston and barrel

anyway I've been advised to run a colder burning spark plug like a series 8

at the moment its got harley 10r 12a plugs and I think a part no 32997-01 would be good (but think this is obselete - cos I ordered from Jersey Hd and they said so)
or maybe some NGK 8's

to remind you heres the spec
- quite tuned putting out 104 bhp at rear wheel

NHRS 1250 kit
mikuni hsr42 carb
crane single fire ignition
full race exhaust system
carbon oval race filter
SE 536 cams
bit of fettling of thunderstorm heads

Try P/N 32335-04