YG & YB Series

Engine: 80/100cc two-stroke singles Weight: 70-95kg Top speed: 60mph Year: 1963-2007 Engaging disc-valve machines and the YG1 formed the backbone of innumerable versions, including 100cc YB100 and earliest Yamaha trail bikes. First YGs were premix but later moved to Autolube. Look for rot in swing arm and rear section of pressed steel chassis. Easy to work on and relatively cheap to restore, the classic scene has so far not picked up on these midget gems. Parts not overly expensive and they make potentially good entry-level machines for wouldbe restorers or those who are new to the world of Japanese classics.