What's the oldest 4-wheeler you own?

i have i think 87 suzuki quadsport 230, the f**cking thing vibrates like a biotch, its impossible to ride it anymore

You should see if the balancer is still intact. Unless its too oldschool to have one. Blasters have one so unless suzuki's just that ghetto, it should have one.
 
it isn't vibrate at all, i had a 86 lt230, it was a very smooth running quad. something is f*cked with that one.