I have a 1972 or 1973 Chaparral motorcycle, the clutch, transmission, gears, and oil were all replaced. There is no rust. When shifting you have to hold the shifter down to get it into gear. Does anyone know what would be keeping from not shifting properly? Or have any idea how to fix it. If not, any idea where I would be able to find a repair manual? I have checked ebay several times for one but cannot find any thing So if anyone could help me I would appreciate it very,very much. Thank you.