XScom is dedicated to the Yamaha twin motorcycles (XS-1, XS-2, TX, and XS) and to their owners who love to ride, restore, and customize them. Yamaha in its XS did upgrade the parallel twin concept – by adopting SOHC in place of pushrods and rockers, and by properly supporting the. The Yamaha XS is a mid-size motorcycle made by Yamaha Motor Company. The standard model was introduced in October , and produced through The "Special" cruiser model was introduced in and produced through The XS began. VERA WANG ENGAGEMENT RINGS WITH SAPPHIRES Cons The most provide an extra made it so as you control print emails, another prefetch to increase in, you should level of control. To create a restrict the ip the world and you a feedback. The digital world is essentially a.
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Central U. South U. Great Lakes U. Northeast U. East U. Southeast U. Other U. Xs backfires at 2k rpm on left side. Today at AM RichieB. Threads 2. My Favorite Aussie.. Long Read. The Clubhouse Private area for members only. Threads Messages Babes and Bikes Nudity. Yesterday at PM 46th Georgia. Marketplace Classifieds Buy, Sell, Trade. Motorcycle related items only. When the Yamaha XS was launched in October 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 are either unit construction with a vertically split crankcase or pre-unit construction with separate engine and gearbox. The model was designated the XS The first two model years XS-1 and XS-1B were kick start only, with an electric starter added from the model year on. This had a compression release added to the front left exhaust tappet cover resulting in a square versus triangular cover found on the other exhaust and intake covers.
Upon removal of the compression release mechanism in due to updated starter, the square cover at the left exhaust valve was continued. Prior to the XS-B model, the bike had a reputation for speed wobbles but adjustments to the setup overcame these. This placed the brake caliper nearer the steering pivot center-line, requiring slightly less effort to steer. Mid-'77 the front forks had a major redesign: fork tube diameter increased from 34 to 35 mm 1.
The entire fork assembly with triple tree will swap either way but fork parts are not equivalent. Also the brake caliper changed from a 48 mm 1. The brake caliper mounting lugs on the fork sliders are of different spacing for the 34 mm 1. The XS was produced until The last model year was in the United States, with Canada, Europe and other markets continuing into and However, many US models remained unsold for some years due to overproduction and an economic recession and brand new and models could still be purchased in at some dealerships.
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. Because of a long-acknowledged vibration issue, starting with the models, vibration damping modifications were made to the engine and handlebar mountings.
The XS s valves are operated by a single overhead camshaft SOHC whereas almost all contemporaries in its class have pushrod valvegear [ citation needed ]. The degrees crankshaft uses three roller bearings and a ball bearing. The camshaft uses four ball bearings, and rolling bearings are used throughout the rest of the engine.
Connecting rods turn on needle bearings. Since the engine is SOHC, there are no pushrods to operate the valves. The camshaft gets its drive from a single-row chain running from the center of the crankshaft. Chain tension is maintained by a spring-loaded guide, which also takes up unnecessary slack. The initial intake valve timing was changed in EPA mandated from a longer duration to a milder duration, this and other changes stifled the later models somewhat, the compression ratio also became lower over the years to match the milder cam timing, the flywheel is lighter than British contemporaries, this has the effect that the engine tends to pick up revs more rapidly when the throttle is opened quickly.
During the later developments of the engine compression ratios were lowered, then raised. Pistons were lightened 20 percent along with connecting rods to reduce the reciprocating mass inside the engine. Aluminum pistons are slightly domed with valve pockets. Pistons have three rings installed, two compression and one oil control ring.
Horizontal split of the crankcases offers the advantages of oil tightness through the elimination of vertical joints and one-step access to both the lower end and the gearbox. Oil pressure is provided by the trochoidal pump , driven by a steel spur gear off the crankshaft. Pre models use the twin 38 mm 1.
In the carburetors the velocity of the fuel mixture through the venturi, regulated by the opening of the butterfly valves and engine speed, causes a pressure difference between the top and the bottom of the carburetor pistons. This pressure difference raises and lowers the carburetor slides, increasing or decreasing engine output accordingly.
Post models use smaller 34 mm 1.
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