My 1958 350 NH is fitted with a standard 376 monobloc with a 200 main jet, 106 needle jet, 25 pilot jet and 3 1/2 cutaway slide, C needle. It is running very rich at low throttle settings, sooting up the plug and misfiring if ridden in slow moving traffic.This is despite the throttle needle being se...

Thanks very much Simon - useful website!

Hi, hopefully this should be a simple one - although I have found the correct main jet, throttle valve size and needle position for the monobloc on my 350 NH I can’t seem to find what the pilot jet and needle jet sizes should be. Any help much appreciated!
Thanks, Alistair

Many thanks for your replies - the slots on the clutch centre are certainly a bit worn so I’ll try filing them to smooth them. Think the clutch centre still has its stop tangs so that should be ok but will also check for any fouling of the clutch operating arm at the gear box end. Have wondered whet...

I recently acquired a1958 350 NH and on my first run out the clutch jammed in the disengaged position resulting in a ride home with the AA. I stripped down the clutch and found that the first plate in the basket was a cork one rather than plain as it should have been - think this may have jammed in ...