This is my K-4. I worked on it last fall and winter. Sandblasted to bare metal primed with 2 part epoxy primer. The paint is a Dodge lime green which when mixed I had them add a corse metallic instead of a fine blend.
I replaced the seat, tires, bars, cables etc.
the engine is an 88 bbk with race head, NHRC pipe and Mikuni vm20 carb running a 135 main jet, 25 pilot and 4j6 jet needle. Sprockets are 16t front and 35 rear. Top speed to date is 51.86 mph according to GPS.
Over this winter the engine will come out again and have a stroker crank installed.
I also have a 69 Z50A-K1, 1976 CT70, 1980CT70, 1979XL100s, 1985 TRX125, 1985 Suzuki LT250 and a 1985 Suzuki LT50
Mike.
If it ain't broke. It soon will be!