Z1OwnersClub GB

standard bore z1a , was running 117.5 main jets , bogsdown ,sooty plugs , needles at #3 , put standard 113's in , kerker 4-1 ,standard airbox ,
113's too lean?
Had the carbs chemically cleaned
Thanks

Probably had the larger jets to suit the Kerker, 113 may be too small,with larger jets fiited check out mixture with a Gunsons colurtune/May be worth checking seating of choke plungers,good 12 volts at coils,dropping needle one clip at a time,see if improves sootyness with filter out.try good run and get engine up to temp for a plug chop,dont just run bike on stand plugs wont get to self cleaning temp,if using Ngk plugs replace with nippon denso w24-es..Cheers Paul J

Now that is a "proper" answer!!!