Vintage Original 1977 Kawasaki Kz650 Service Manual on 2040-parts.com

1978 Z650-B2/B2A

Very few differences were made to the B2. The front brake caliper was reversed to the back of the fork leg and the front master cylinder reservoir was changed from a round item to a trapezoidal one. The charging system was changed from a three-phase system to a two phase and the regulator and rectifier were now combined in a single unit. A hazard switch was added to the left-hand switchgear. Needle roller bearings were now used in the Swingarm instead of the previous models plain bushings and slight modifications were made to the carbs to improve low speed operation. The manual operation fuel tap was replaced with an "automatic" diaphragm type unit. There were also some slight detail changes to the outer engine cases to incorporate the new lower case Kawasaki logo. The front forks were slightly modified. The B2A was a US-only model with 22mm carburators, as opposed to the 24mm items fitted to units sold elsewhere. Power output was reduced to 60 hp (SAE net at the crankshaft) at 8,000 . This change was probably due to emission requirements in the US market. All other aspects and equipment of the B2A construction were identical to the B2 models sold outside the US.

Both the B2 and B2A received the four way hazard flashers that had been previously installed only on the C1.^[2]

1978 KZ650-D1/D1A

This was actually the first "SR" model released. The D1 may have been sold only in Japan but this is unknown. It featured a lot of the equipment from the C model but with a different frame, the substitution of a 16-inch rear wheel, deletion of the tailpiece (which was such a trademark of the B/C models) and an entirely different seat with a "tuck and roll" appearance to give it the full-on "chopper" look. As well, the fuel tank shape was completely different from the B/C models and more in keeping with the "chopper" look. As well, the D model featured rubber mounted two bolt style footpegs. All other models used a single bolt rigid style peg setup until the 1979 models. All D models also included a "Low Fuel" warning light incorporated into the tachometer faceplate.

The D1A was a US-only model with 22 mm carburetors, as opposed to the 24 mm items fitted to units sold elsewhere. Power output was reduced to 58HP (SAE net at the crankshaft) at 8,000 RPM . This change was probably due to emission requirements in the US market. All other aspects and equipment of the D1A construction were identical to the D1 models sold outside the US.