The XS650's engine was used in AMA Professional Dirt Track Racing by national champion Kenny Roberts. In 1969 only the Laverda 750S, and the Honda CB350, also launched that year, matched the XS 650's modernity of unit construction and SOHC valve operation. The 1970 model was designated the XS-1. [4] .

Will it make your XS engine last forever? Need tech advice, give us a call, we can help!

Aug 21, 2009 · Yamaha XS650. Years produced: 1970-83 Total production: 500,000 (est.) Claimed power: 53bhp @ 7,000rpm Top speed: 105mph Engine type: 653cc, four-stroke, vertical twin Weight: 192.6kg (428lb) wet Price then: $1,245 (1970) Price now: $1,500-$2,000

Aug 15, 2016 · Despite having been delayed for about eight years the Yamaha XS650 boasted one of the most advanced parallel twin-engines extant. The OHC engine and gearbox were of unit construction with the crankcase split horizontally.

Mikes XS is the leading supplier of Yamaha XS650 Parts and Vintage Yamaha motorcycle parts. Filters, Chassis, Brakes, Wheels, Suspension and Engine products are just some of the items we carry.

Mar 1, 1979 · That reality starts with the 653cc sohc engine, which is slightly oversquare with bore and stroke of 75 x 74mm. The 360°crankshaft uses three roller bearings and a ball bearing, and drives the...

Aug 25, 2016 · Technical Editor Kevin Cameron examines the interesting history of the Yamaha XS650. Check out more classic motorcycles at CycleWorld.com.

Listed below are quick-reference links to threads in the forum on specific XS650 technical topics. If you can't find what you are looking for, try the Forum Search feature or browsing the main forum by Tags. Rephasing an XS650 engine: "Rephasing, What is it?" Cylinder head torque pattern and specs: "Bad Head Torquing?"

1969 Yamaha XS650 specs, performance data, engine specifications, pictures, updated January 2025.

Oct 13, 2014 · You really need to carefully check the timing with a light while the engine is running to make sure the base timing is correct and that it is advancing as desired. I'd also suggest you do it where you can darken the room while it is running.