I’m sure that bike was a real workhorse. It would still be a fun bike to ride in the vintage class at local enduros, hare scrambles, cross country, etc.My wife won a Pennzoil gas powered go-kart in a drawing at a store. It was a nice kart with a full fibre-glas body.
Anyways, rather than even start it up, we decided to sell it instead. It didn't sell, but we did trade it for a used Yamaha 125cc three-wheeler.
After having it for a while, I saw a CL ad for the 1980 KDX 400 listed by a guy in Phoenix. I called and asked him if he might be interested in a trade? I told him what I had and he said he would.
I made the run to Phoenix, rode the KDX up and down the street and we made the swap.
I had that KDX for quite some time and was very pleased with it's performance and durability.
In my opinion dirt bikes became modern in the mid eighties. There’s not a huge amount of difference in performance from then until today. Of course the capability of a motorcycle depends more on the rider than the performance specs of the motorcycle. Unless you’re competing for a national title you don’t need the minor advantage a newer bike provides. There’s VERY few riders with the talent to utilize that advantage.
A mid eighties woods bike, motocross bike, trials bike, or desert bike can still be very competitive at a local level and in my opinion they are more fun and clearly more comfortable.
I trail ride a lot with riders on much newer bikes. They’re always curious and want to try my KDX or XR so we’ll swap for a bit. It doesn’t take long until I’m ready to trade back. The newer bikes with their rock hard 4” wide seat and abrupt power delivery will wear you out a lot faster.
On the other hand they always enjoyed riding my bikes and want to keep riding it. lol
I don’t ride competitively any more so I’m just out to have fun. For me, the older bikes are more fun.