ɪn nˈaɪntiːnhˈʌndɹɪd sˈɛvənti tˈuː sˈɛvənti sˈɛvən, hiː ˌɪntɹədˈuːst tˈuː mˈɑːdəlz, wˈʌn fɔːɹ mˈɑːɾəkɹˌɔs wɪð ɐ fˈaɪvspˈiːd ɡˈɪɹbɑːks ænd ðɪ ˈʌðɚ fɔːɹ ɹˈoʊd.
In 1972–77, he introduced two  models, one for motocross with a five-speed gearbox and the other for road.