Yamaha XS 650 — Wikipedia, the free encyclopedia

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Yamaha Fazer Midnight Special

Yamaha XS 650

3USgal (11L; or 4USgal (15L; 3impgal)

The XS650 is a mid-size motorcycle by Yamaha Motor Company. The model was introduced in 1968 and through 1979. The Special model was introduced in 1978 and through 1985. The XS650 with the 1955 Hosk 500 twin.

After about 10 of producing 500 twin, Hosk designed a 650cc twin. the Hosk company was acquired by Corporation. and in 1960 Yamaha had Showa with Hosk’s design of 650 cc twin. [ 1 ]


history [ edit ]

The 1970 was designated the XS-1. [ 2 ] Subsequent Xs650 models [ 3 ] were (1971), XS-2 (1972), TX (1973), TX-A (1974), (1975), XS-C (1976), (1977), XS-E (1978), (1979). 1979 was the last of the so-called Standards (an unofficial commonly used to differentate it the Special, which has pullback a teardrop tank, and other in appearance). The Es and Fs also came in form: XS-SE (S for Special) and

From then on they Specials only to XS-SG, XS-SJ, XS-SK. There was a II (Two) model designation in (XS-SF-II), 1980 (XS-G), (XS-H) which were with fewer chrome and drum rear brake 1980) or wire wheels versus disc rear or cast wheels.

The first two years (XS-1 and XS-1B) kick start only, an electric starter added the 1972 model year on. had a compression release added to the left exhaust tappet resulting in a square versus cover found on the other and intake covers. Upon of the compression release mechanism in due to uprated starter, the square at the left exhaust valve was

Drum fronts on early cannot be changed.

Pre ’77 ’77 fronts have (offset) brake discs, the swap but not the discs.

Drum wheel into rear frame needs the rear frame swingarm too.

rear wheel into drum frame needs the disc frame swingarm and needs brake master-cylinder welded to the frame.

Handling on swapping rear wheels:-

Standard rear tire is Special rear tire is Because the Standard tire is it will tend to steer a bit quickly. Because the Special is wider it will tend to be a bit in a straight line.

Overall is not changed from the Standard, as the two are essentially the same outside

Prior to the XS-B model, the had a reputation for speed wobbles but to the 1975 setup overcame

1976 models had the front caliper moved to the right leg, behind the fork as to in front of the fork. This the brake caliper nearer the center-line, requiring slightly effort to steer.

Mid-’77 the forks had a major redesign, tube diameter increased 34 to 35mm (1.4in) and internals changed (although this holds true for various of the same tube size). The fork assembly (with tree) will swap way but fork parts are not equivalent. the brake caliper changed a 48mm (1.9in) dual cast iron design for the (1.3in) fork to a 40mm aluminum single piston caliper for the 35mm (1.4in)

The brake caliper mounting on the fork sliders are of different for the 34mm (1.3in) and 35mm forks so the calipers can’t be

End of production [ edit ]

The XS 650 was produced 1985. The last model was 1983 in the United States, Canada, Europe and other continuing into 1984 and However, many US models unsold for some years due to and an economic recession and brand new and 1983 models could be purchased in 1987 at some

Design [ edit ]

Engine [ ]

Yamaha Fazer Midnight Special

Like its contemporaries in its class the XS 650 has a crank angle. This an even firing interval the two cylinders. but also generates vibration caused by the two pistons and falling together. This is particularly noticeable at idle .

The XS valves are operated by a single camshaft (SOHC) whereas all contemporaries in its class have valvegear [ citation needed ] .

The 360 degrees crankshaft uses roller bearings and a ball The camshaft uses four bearings, and rolling bearings are throughout the rest of the engine. rods turn on needle Since the engine is SOHC, are no pushrods to operate the valves. The gets its drive from a chain running from the of the crankshaft.

Chain tension is by a spring-loaded guide, which takes up unnecessary slack. The valve opens 47 degrees closes 67 degrees ATC, intake duration of 294 degrees, duration on 281 degrees, and an overlap of 88 Because the flywheel is lighter British contemporaries, the engine to pick up revs more when the throttle is opened

During the later developments of the compression ratios were then raised. Pistons lightened 20 percent along connecting rods to reduce the mass inside the engine. pistons are slightly domed valve pockets.

Pistons three rings installed, two and one oil control ring.

Horizontal split of the crankcases the advantages of oil tightness through the of vertical joints and one-step to both the lower end and the gearbox. Oil is provided by the trochoidal pump. by a steel spur gear off the The main bearings, crank transmission main shaft, bushing, shifter fork bar, and rocker arms are by pressurized oil, whereas the of the engine is lubricated by “oil [ 4 ] [ 5 ]

Carburetion [ edit ]

Pre-1980 use the twin 38mm (1.5in) velocity Mikuni carburetors can be tuned by moving the needle position, or by replacing jets. In the the velocity of the fuel mixture the venturi, regulated by the opening of the valves and engine speed, a pressure difference between the top and the of the carburetor pistons. This difference raises and lowers the slides, increasing or decreasing output accordingly.

Post-1979 use smaller 34mm (1.3in) CV carbs with needles seem to be listed in parts as being ‘fixed’ position,(in words a needle that may have one clip position). The and main jets can be changed for sizes. If the 34mm (1.3in) CV needles only have one clip position.

Ignition [ edit ]

The models up to use points ignition. Two sets of are located on the upper left of the head. On the right side head, an advance mechanism is An advance mechanism is used to the timing for easy starting and idle.

Post-1979 models use ignition systems.

Yamaha Fazer Midnight Special
Yamaha Fazer Midnight Special
Yamaha Fazer Midnight Special
Yamaha Fazer Midnight Special
Yamaha Fazer Midnight Special


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