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Mark try this link It has some great pics and info on Cagiva http://amicidelwmxcagiva.com/

Chase nice project I am in envy..... Your bike looks like either the 1985 model with the desert tank or the 1986 model. They where pretty much the same bike. the 1986 got the giant tank and a floating front disc versus the 1985 which had the solid mount disc and the smaller mx tank. Keep posting the pics, I...

Daniel, Not sure on the 1984 model (air cooled?) as we (in the states) only got the 1985-1986 model years(water cooled) but the piston that I used in my 1985 WMX500 was the 1984-1990 YZ490 piston kit and I worked perfectly. Good luck Post some pictures of your bike if you can, I would love to see it. Jeff

Newbie here so bear with me. I too spent LOTS of time on Cagivas as well. In fact was also involved at Action Sport Cycle in Ft. Lauderdale between late '83-early '86. I worked there part time.....ok I was kinda the shop rat!!! I did a little wrenching, selling,sweeping....... I bought my '84 WMX250 (200) and raced many FTR hare...