may i ask how do you identify between a k or f model?
Was your 750 a K model or F model? Either one, if you have kept it, it would be worth a lot these days (especially in US, UK).
Most of us then had to avoid the ROV, my friend had an RD350 - completely stock and was fined for smokey exhaust! WTF! He explained to the cops that it was two-stroke, burned engine oil, and naturally had blue smoke. But they just targeted him for the model.
Cheers!