28 Май 2015 | Author: | Комментарии к записи BMW R100CS-BMW отключены

Who would call BMW trend Even as motorcycles in general become bigger, faster, complex with more and cylinders and valves and carburetors or computer-controlled fuel injection, have come with the basic engine layout 1923opposed Twin, two valves per push-rods, two carburetors and a driveshaft to power to the rear wheel.

The 1981 BMW R100CS is still an Twin, still ohv with still shaft-driven, retaining the concept of the marque even the design and execution have refined and honed. It is expensive, for $6600, and it is very light, 455 lb. with half a tank of

Simplicity, weight and price are BMWs have long light, some of the low weight from simple design and from the use of lighter, but often expensive, materials.

The latest in Japanese motorcycles is toward The Kawasaki KZ750 was big news it was introduced last year, much lighter than its competitors at 491 lb. with gas. The KZ1000J, light for a lOOOcc weighs 519 lb. and the new Yamaha XV920 weighs 519 lb.

BMWs were before light became before that particular began in Japanese machines.

of trends the R100CS is, in a way, one of a of trend-setters. Elsewhere in this there is the Kawasaki 550GPz, comes with low bars, pegs and a small fairing. the Yamaha Seca 550, GS450S and Honda CBX, the GPz is the sign that the Big Four there are people who like bikes.

BMW has known this for Back in 1973 there was a change and the German factory away from its rather image and got into sports. The was the R90S.

It hadas you’ve guessedlow bars, setback and a bikini fairing.

The R100CS is a descendant. BMW has at the same time and broadened its model line. the middleweight R65, the explorer and four versions of the boxer in lOOOcc form; the RT with fairing and upright

riding the RS with a smaller, wind-tunnel-style and lower bars, the standard and the CS, with belly-button fairing.

The relatively low weight hasn’t used to turn the machine a high-performance motorcycle. Indeed, the lOOOcc bikes outdistance it in a of acceleration. The BMW turns the quarter in 13.18 sec. with a speed of 101 mph.

The XV920 13.06; the KZ1000J, 11.56; the 12.26. Even the Seca 550 is turning 12.99.

The appeal of BMW, like others of its is not rooted in raw horsepower or flashing There is an image of BMWs reliable and long-lasting. It is, in a sense, The image attracts a certain of rider, a man who values perceived above performance, a rider likely to abuse his bike hot-rodding around town. BMW are likely to be more … in age and and the way they ride contributes to engine life.

Which adds to the image, attracts more of the same of rider.

Then, too, come with relatively gearing. The R100CS engine, for turns over at a leisurely rpm at 60 mph in top gear, again contributing to engine life.

Look at a BMW and the most obvious things are the two one sticking straight out each The placement puts the cylinders and and exhaust pipes out into the of the airstream, which improves Each cylinder has a 40mm CV carburetor, the intake manifolds inward to give the rider shin room. Curved tubes lead from the to the airbox, which holds a pleated-paper air filter.

Air is drawn the airbox through two forward-facing snorkels.

The plain-bearing crankshaft parallel with the wheelbase, front-to-back in the frame. The crank for the left cylinder is ahead of the throw for the right cylinder. is 70.6mm, while each is 94mm in diameter.

New for 1981 are cylinders. Instead of cast-in liners, the latest BMW cylinders a nickle/sil-icone-carbide coating applied to the BMW engineers say that compared to liners, the bore coating heat conductivity (and cooling efficiency), reduces time and oil consumption, and makes cylinder 3 lb. lighter.

sump below the crankshaft, and is driven off the by a duplex timing chain. are operated by pushrods via rocker and valve lash is adjusted by screw tappets. The crank-case has been made stronger for and has a larger oil sump.

Also new in year’s BMWs is the clutch the unit weighing 40 percent than the 1980 flywheel and As before, the flywheel is mounted to the with a single automotive dry plate carried on a splined input shaft. At the opposite end of the shaft is a helical gear, feeds power to the transmission

The transmission countershaft is connected to the driveshaft coupling, and power is to the drive-shaft through two u-joints. The runs inside the right arm tube and transfers power to the wheel through a crown and gearset. The final drive the single-shock dual purpose GS but on dual-arm, dual-shock road as well.

To meet EPA emissions air is drawn from the airbox and fed the exhaust ports through a of oneway valves and external Like the system on 1979-and-later the BMW clean air injection system use a car-type air pump, but instead upon vacuum created in the by exhaust gases rushing out of the When the clean air meets the hot gases, unburned hydrocarbons reducing emissions.

For the first time on a BMW, an ignition system is used, the plugs through new, coils, one coil per cylinder. The system is changed as well, now two cross-over tubes (instead of between the two separate cylinder assemblies.

There was a time BMWs could be described as vibration free, at least to other machines. But now, rubber-mounted four-cylinder motorcycle are common, the BMW cannot be realistically smooth throughout the rpm range. big, 94mm pistons back and forth in opposition, is, each piston starts (inward, in this case) top … center at the same

Viewed from the rider’s when the left piston is to the right, the right piston is to the left. That arrangement to cancel out much of the vibration otherwise would be produced. the cylinders fire alternately, so at low rpm below 3000 rpm) from power pulses can be through the bars, and images in the blur.

At higher rpm, vibration exists, caused by being delivered first to the throw of the crank, (forcing the end of the crankshaft to the right), then the throw of the crank, (forcing the end of the crank to the left). The amount of is minute, but it is enough to set up a vibration.

The has a classic sweet spot. 3000 and 4000 the engine is At 3750 rpm (65 mph) it is perfectly The mirrors are like, well, glass.

The engine has power and all little forces cancel other out, so when kept within the rev range it the CS is as smooth and happy as any engine on the

The engineers must have this because the gearing this sweet spot where it does the most In top, it’s from 50 to 65 while the rider quickly to use the gearbox in traffic and when around town.

It is important to that even below and that rpm, the kind of produced by the BMW is very different the high-frequency buzz noticed on multis. The BMW’s vibration is controlled and of low frequency, and it is not intrusive or even on long trips. how different vibration can be is best by jumping off a Suzuki GS850 and onto an R100CS.

Both are absolutely, perfectly compared to a Harley-Davidson Sportster or a Bonneville. But in actual fact, the has an underlying buzz felt the bars, and the BMW has an underlying succession of a muted sort of low-frequency reminders that very pistons are moving under the of alternating explosions of vaporized

Running at higher speeds for distances gives the impression of the working, and the faster it runs, the vivid the perceived pulses the bars.

This year’s gains revs much rapidly than last due to the lighter flywheel and shifts too. The clunk that to accompany each shift is and because the engine can change quickly with the reduction in weight, the tendency to miss or have difficulty shifting is

That’s good, because in the of a missed shift bringing rpm over the 7200 rpm redline, it is for those great big pistons to with the equally-big exhaust requiring a top-end overhaul its time. This BMW may not buzz a Suzuki, but then it can’t be to 10,500 rpm either.

While the accelerates and shifts better previous BMWs, it still good gas mileage, 50 mpg on the Cycle mileage test loop, and it comes with a large gas it has exceptional traveling range, 265 mi. before reserve.

In keeping BMWs penchant for simplicity, the has standard forks without air without preload adjustability, damping adjustability. The rear have adjustable preload, Which means that the of damping and preload and spring must be a compromise suited to a range of uses and rider and that compromise shows up a 140-lb. rider encounters small bumps, like highway expansion joints.

the BMW’s suspension is not as compliant as the on a GS1100 set on the softest settings, and the reach the rider and make the and tachometer bobble up and down on rubber mounts. The bike handle well at high on smoother surfaces.

In street the footpegs on each side first, and it will take a soul to drag the cylinder On the racetrack, it is possible to drag the on each side, with the Metzeler street tires.

it is light and because the center of is relatively low, the BMW responds quickly and easily to rider in ess turns, making an accurate from right to left to without hesitation. But the rider be careful of two things if the bike is at top speed.

First, upon accelerating a-brupt, drastic pavement or potholes at speed, the front end very light, as if the front isn’t staying on the ground, and the changes direction and the handlebars back and forth as the front is deflected. To its credit, the bike return to its original course requiring any action by the rider than hanging on.

Next, BMW may have proceeded the Japanese for low weight and even the current of shaft drive, but they haven’t figured out how to eliminate torque reactions in the rear end of a The lighter flywheel seems to and draw attention to the unchanged reaction. Grab a handful of and the rear shocks extend, the of the seat rising as the driveshaft works against the ring in the final drive.

Slam the shut, and the rear end sags. when the rider is careful and the is not worked rapidly to the extremes, the and fall of the rear end is pronounced and real. Holding the gas on over a dip in the will prevent the shocks absorbing that dip, an perhaps if the dip would normally the shocks to bottom, a disadvantage if the dip is at a exit and inaction of the shocks the rear tire to slide power.

Enter a turn over to the limits and close the and the ground clearance will be To be ridden at the limits the BMW demands in approach. Several other with driveshafts, including the GS650, the Yamaha Seca 750 and the CX500, have less reaction at the rear wheel.


year all the BMWs larger the R65 get new forks, leading axle with the usual long but with better damping than that of previous BMW Instead of the rocking horse that used to come a BMW’s brakes were the new forks behave much predictably because of the improved Ride quality of the forks is at as good as the old models, perhaps

Evaluating the ride quality of a BMW coming to grips with the It’s a reasonably sized and seat, with very padding and a tendency to break-in or a new shape as it’s sat on for long of time. Because the seat is firmer than many of the big bikes, it makes small more noticeable and that the suspension seem to be harsher it really is.

In any case, the BMW doesn’t one of those seats that immediately liked, but it is possible to on it for quite some distance.

too, is the failure of BMW engineers to to grips with sidestand and placement and design. True, the position is such that if the wheel is removed, the bike forward, perched on stand and wheel. If the front wheel is the bike rocks back, by stand and rear wheel.

But it is also true that and using the centerstand is difficult; once the centerstand is lowered by a extension on its left side, the rider must shift his inward onto the main of the stand to deploy it, and that the foot shift the stand has an tendency to spring upward the retracted position; that the itself is too narrow to support the securely on uneven, rough, or pavement; that reaching and the sidestand is almost impossible to do first getting off the bike and with the toe. There be, and are, better ways to stands.

Footpeg position, has been improved. But the higher, forward pegs are still so to the passenger pegs that a feet hit the rider’s feet if the pegs are adjusted to the forward And BMW issued a recall earlier year of right-hand footpegs, that the peg location was dangerous and easy reach of the rear lever.

Our test bike was before the recall, and it was difficult to the rear brake quickly.

The brake is a mechanically-operated drum, the a double-disc activated by hydraulic with Brembo calipers. The master cylinder is located on the handlebar. The 10.125-in. discs are compared to many other but yield good braking for the weight and speed of the bike. feel was a matter of controversy staff members, some the front brake felt some thinking it was fine.

The on 1981 BMWs are better those on previous models.

Happily, the horns on the BMW are state-of-the-art, one wonder why all bikes don’t such wonderful, loud, horns. Same for the big quartz-halogen

Instruments are well-lit and easy to including the fairing-mounted clock and and accurate.

BMW controls are different and After years of staying the up down turn signal while everybody except used right-left, BMW has gone to for the signals. At the same time the button is at the top of the cluster, a distance the rider’s thumb, and the signal is at the bottom, opposite to what the have.

No big deal; BMW buyers to keep their bikes for and don’t swap brands but for the first few days it is likely intend to politely signal and instead rudely honk, or versa.

More important in the long run is the sad that BMW no longer fits a throttle stop. There’s no way to set the for cruising and the return springs are firmer than two CV carbs

The finish of everythingcastings, paint, everythingmakes the typical mass-produced look, upon close cheap, unfinished. Examine the on a BMW cylinder or the finish of the cases, and not find any defects hidden by paint. The welds are works of the pin stripes hand-painted instead of stuck-on de-cals, the fenders fiberglass instead of cheap and stamped steel.

The tool kit is a usable set of tools, not pot-metal of tools, that fit and can be used to do work on the motorcycle. Included are irons capable of removing a a patch kit capable of patching an tube, and a tire pump of inflating a tire.

Maintenance is and straightforwardone bolt secures rocker cover, and valve is via screw tappets. There of course, only four total to adjust on the motorcycle.

The hub is cleverly designed so that the gear and brake assembly in place when the rear is removed, the wheel hub including a that fits into the assembly. To remove the rear one pinch bolt must be on the left end of the axle, and one axle nut (on the side of the axle) removed. the axle easily slides and the rear wheel comes out the bike is supported by the center and front wheel.

It takes two minutes.

It’s possible to buy a ride off the showroom floor, nothing except riding and the bike, travel out onto the get a flat tire, repair the tire, and continue on your no truck needed.

That’s right there. In fact, we name a single other of motorcycle that comes, with the same degree of and ability to be maintained and repaired by the

We can’t think of another of bike which is finished as either.

Which, we’re has a lot to do with why the BMW1923 concept 1981 executionis alive and in America today.


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