I'm a small engine guy but trying to get a 99 YZ400 together for my son. It was bought tore apart needing a timing chain. Its all back together now but won't start. The starting procedure states to push the kick start to the extreme resistance position. There isn't one. I can , with modest effort kick the engine over and over. There is a different "feel" when the compression release is on (though missing the cable and lever for it grrr!) but not a bunch easier. As best I can I've followed the Clymer manual, it states to install the cams at TDC identified when the "I" mark in the flywheel is in the side case sight hole. This one has what looks like the word "HI" written on it. no other markings. Used the I, would that be right? Otherwise the cams are installed with the lobes opposite each other, the 2 dot markings on exhaust cam gear facing out and down (or up). Overall condition of the piston, cylinder and valves seemed quite good. Any ideas?