I recently acquired a 1990 KDX200. The bike runs reasonably well for it's age. The first ride over 30 min the gearbox oil started overflowing into the airbox (overflow hose is routed to airbox). The oil that overflowed and the oil in the gearbox are an odd shade of dark forest green. The oil appeared to be overfilled slightly which explains the overflow. What I don't understand is the weird dark blueish greenish gray color of the oil. I believe the PO used motul 10w40 ester gearbox oil because he gave me a half used gallon. I use Motul 710 2t oil which is blue, and run green coolant in the radiator. I drained the gearbox oil and there was a nice little clump of dark gray metalic paste on the magnetic drain plug, which should explain the gray hue. What I do not understand is the greenish blue hue. Anyone know what in the heck is going on with this old horse?
The pic shows a sample of my drained oil. When held up to the light it turns more of a green color. Oil still feels slick as can be.
This is an early 1970's dual sport. 175cc, two stroke, side valve. Surprisingly powerful. Runs on premix (not oil pump). Perfect for a bit of fun around a field or farm, or as the basis of the proper restoration project.
Was a "barn find" that has been brought back to life with a very light restoration. No title, no papers, no lights.
- both tires and tubes
- front brake pads