Xs650chopper.com is an online community for fans of the Yamaha XS 650 motorcycle
Title
XS650 Chopper is all about Yamaha XS650 motorcycles. Send in your XS650 Choppers, Bobbers, Ratrod or whatever. SATISFY YOUR XS650 CHOPPER ADDICTION. Send in pictures. Share your XS650 with the world.
Description
Excerpted from the website:
- Over a quarter million XS650s in 40 different variations were produced by Yamaha between 1970 and 1985. The XS650 big twin, in America and worldwide has developed a cult following for good reason. At the heart of the XS650 is a indestructible engine. The best parallel twin ever built.. Tough durability, classic look and abundance of cheap parts make the XS650 the perfect platform to build a KILLER Chopper.
When the Yamaha XS 650 was launched in 1968 it had one of the most advanced engines in its class of large parallel twin motorcycles. The engine and gearbox are unit construction with the crankcase split horizontally for ease of assembly whereas almost all contemporaries in its class in 1968 are either unit construction with a vertically-split crankcase or pre-unit construction with separate engine and gearbox. The XS 650s valves are operated by a single overhead camshaft (SOHC) whereas almost all contemporaries in its class have pushrod valvegear. In 1968 only the Laverda 750S, also launched that year, matched the XS 650's modernity of unit construction and SOHC valve operation.
However, like its contemporaries in its class the XS 650 has a 360° crank angle. This provides an even firing interval between the two cylinders, but also generates some vibration caused by the two pistons rising and falling together. This vibration is particularly noticeable at idle, and may be considered desirable or undesirable depending on the rider's personal preferences. This also can be a problem when the bike is put onto its center stand while the bike is running because the bike will have a tendency to use the vibrations to walk backwards. Even this phenomenon may be desirable because it opens up the possibility of backwards center stand drag racing.
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