Snap! - I also had a 250cc souped up trials bike in the late 70's - had 13 inches of nitrogen gas suspension on the front forks - was a Yamaha 250 XT - called it 'The Jumping Master' - due to the fact that I was always getting some air on it - particularly coming up Jones or Taylor street in San Francisco and clearing the intersection of Leavenworth Street - landing halfway down the next block - would often go over the bay to Mount Tamalpias too to take it off road - was a great little fun bike - and I never crashed out on it - lucky me -That brought something to mind to me. When I got back into civilian life, I found pure joy in trail riding Suzy -- my 250cc souped up bike. It had welded peg chains, compression release, 5" knobby rear tire, 53-tooth sprocket, innertube front mud flap, tooth bar, and large dia front wheel.