Spark plug reading

Trying to tune top end my kz 1000j in a tractor pull this is a picture of my plug wide open top end.well about 7000 rpm with a small flutter.what do you think. I need some advise if anybody could help me out. Stock motor with open pipe stock main jets, with bigger pilots!!!

would say it's fine, even if it's a bit on the edge of lean....

maybe go +2 to +5 on the mains and see if you get more of a grey ring on the bottom of the insulator?

not a tractor pull expert by any means, just a road racer....

Looks good to me. Like fresh baked bread.

Be better off with a HD motor for a tractor.
Steve

swest wrote: Be better off with a HD motor for a tractor.
Steve

Or even for a tractor trailer......


:laugh: :laugh:

To me it's lean go up two size on the main jet's.

Also with this ethanol blended fuel it does not color plugs like gas did back
when these old KZ's were built.