hi, i´ve not long bought a bonneville t120 1971, i am trying to figure out how to identify what year some of the parts are....the log bog claims it´s a 750, i thought they only made 650´s then went to the t140 for the 750, am i completely off mark? does anyone have any tips, or good websites i can collect information from?..i have tried alsorts and now hitting a dead end. i will be grateful of anything thank you