The Yamaha xs650 first appeared in the early 70s as the xs1-xs2.and was yamahas first serious attempt at a four stroke bike.Bieng a 650 it was firml aimed at the british market sector ,its main target bieng the triumph bonneville,the enging,although an overhead cam unit,looks at first sight like a pushrod motor,a piece of clever design..these units have gained a reputation as bieng nearly indestructable provided they are sensibly maintained.the bottom end has enormous ball roller main bearings that are larger than needed,and the cam runs in a pair of ball rollers either side.
The late Tony Hall of Halco tuning offered several overbore kits for these motors 840cc.the most common to 1100cc developed by him from drag racing experience with these bikes. so the motor is a fair bet
Because these engines are all alloy witth big bearings they do clatter a bit until they warm up ,anyone selling one who claims they have a quiet one is either deaf or lying.
Bad bits.the generators on these can destroy the rotor windings,usually caused by overrevving the motor a lot.once this happens the battery dies and so does the motor.the rotors can be rewound but it aint cheap!..Oil filters..The xs has 2 one in the right side of the engine ,wash it out,no problem and one in the sump wash it out....and the micro fine gauze splits ..DOH!! hard to get (especially since the death of Tony Hall
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