KZ Riders,
I'm thinking about using hotter plugs on my '78 KZ1000, and I wanted to see what you all think, what your experiences have been.
Like I said, my bike is a '78 1000. I've been running standard B8ES NGK plugs. I'm thinking about going a step hotter-- to NGK B7ES.
It still has points, standard coils. The timing is slightly advanced.
I have done the Wired George mod, running a hot line straight to the coils from the battery.
I have jetted up the carbs, and they have pods on them. The air mixture screw is one full turn out on each carb (it pops if I lean it out beyond this) .
The carburetors themselves are a rack of VM28s (with accelerator pump) off of a '79 KZ1000E1 (shaft).
The exhaust is a Delkevik four into one, baffle out.
The bike screams-- BUT it gets about 30 mpg, and the plugs are always soot black. It's not oil, it is fuel. It also smells pretty rich on idle.
So, I was thinking that there clearly is further combustion of fuel that could happen, but isn't happening-- due to all these factors (i.e. jetting, no baffle, older points system).
Could I safely obtain greater fuel efficiency by running the hotter NGK B7ES plugs?
Other factors: I live in southern Arizona, and it is hot. When I get out on the highway, I hammer on the throttle, and tend to live somewhere around 90 mph.
What do you all think?