Yamaha XS750 SF Special — Vetter Quicksilver — Updated January 2012

26 Фев 2015 | Author: | Комментарии к записи Yamaha XS750 SF Special — Vetter Quicksilver — Updated January 2012 отключены
Yamaha XS 750

Déjà Vu

1979 Yamaha Special Combining a Yamaha Triple with a Vetter fairing created a synergistic back in 1980. Recreating combination more than 30 later evokes a little Déjà Vu.

C oinciding with the of the music industry’s disco the Yamaha XS750D standard arrived in late 1976. The press at the time commended new 750 Triple as being a competent and motorcycle, but found it not too exciting a little like taking sister to the movies. Certainly OK, but options usually come to

All that changed for 1978 an increased emphasis on performance and more importantly, the introduction of the

The engineers at Yamaha had been bike trends here in the for quite some time, borrowing a few of the design elements the Harley crowd. Borrowing from other manufacturers new then and it certainly isn’t new but the XS750 Specials began the bad boy trend at Yamaha that to this day.

Cruiser a teardrop fuel tank, seat, bobbed rear short mufflers and a leading-axle fork completed the largely transformation. Just the thing for cool while cruising the we were told.

My street experience began in 1964 a string of small to medium-sized 2-… street bikes, a 4-… twin and even a of Harleys, but I found myself a bike in late 1979. All of the machines taught me way more I wanted to know about ignition and chain maintenance. I that my next bike include electronic ignition and drive, look great and be fun to — with enough and handling to do anything I needed it to do.

My ended in early 1980 at a Yamaha dealer’s showroom a pulse-quickening carmine red 1979 XS750 Special.

My first XS was put to as a commuter in the spring of 1980 about 55-miles roundtrip 5 a week and as an occasional weekend The somewhat short riding here in Montana can be stretched to 5 full months, with the and late season requiring cold and dark morning The cold, the rain and the bugs became wearing. I rode a full-face helmet, good boots and a selection of jackets, but weren’t enough.

I needed protection from the elements.

in the day, Craig Vetter was worldwide for his great looking and functional aftermarket fairings with a bike-specific mount, fit nearly all of the then currently motorcycles — including my Yamaha XS750 Special. the larger Windjammer model the most popular Vetter I wanted a smaller and lighter that didn’t detract sporting nature of the Yamaha, but provided enough wind, and bug protection to help make a more pleasant experience.

Luckily, Vetter also the smaller and more versatile shown here, which just 12 pounds to the bike. In the combination looked great and the bike a lot more livable on a day to day

Nearly every biker met through the years has expressed at some regret for selling a they once owned. no exception. I regrettably sold red XS750 after 8 years and than 27,000 miles of While I owned a series of bikes from the late to present, I had been without a bike from late through late 2008 some 20 years.

I had a lot of good on that first XS750, and in 2008 I began wondering any XS750 Specials were on the road. So, an Internet search Like the prodigal son, I was home.

Meet Déjà. The 1979 XS750 Special here was purchased in January from a Yamaha dealer in Dakota, which was then to my home in Montana. This was chosen because it was an unmodified and appeared to be in decent condition.

a realist, I knew that any 30-year old bike would some TLC, though I the bike to be fully functional and any significant mechanical problems. a motorcycle via long-distance can be somewhat but working with an established dealer helped, as did the selection of digital photos and a video provided by the dealer.

Soon acquiring Déjà and returning it to I began looking for another Quicksilver. I then learned Vetter had gotten out of the business in the which meant buying a new wasn’t likely. However, came to the rescue! A Wisconsin dealer was advertising an NOS (New Old Vetter Quicksilver on eBay for the same price I paid in

As it turned out, Milwaukee had about a dozen NOS Quicksilvers on as well as the exact Yamaha Special fairing frame I needed.

In addition to adding a fairing to both my first and XS, I also installed new sport-oriented Instead of the bolt-upright sitting the factory rubber-mounted cruiser forced the rider into, the new sport bars (still allow the rider to sit in a more slightly leaned-forward position, provide for all-day riding

Period magazine reviews that the Specials weren’t suited for carving canyons. I that replacing the ungainly cruiser handlebars with a set is more sport-oriented will riding comfort, handling and confidence.

It’s been that you can never go back. I don’t have to commute I very much enjoy my new-to-me XS every chance I At the time this was written, has delivered another 6,000 miles, and the XS Special has proven to be as reliable and just as much fun as I

The 1979 Yamaha XS750 is a great looking and performing motorcycle. The addition of the Vetter and sport handlebars complete the and now more than 22 years selling my first XS, I can’t feeling that sense of vu whenever we’re on the road

Inspired by the Brits, Yamaha’s into the 4-… street realm began with the XS-1, a 650cc vertical which was the largest motorcycle Yamaha had built to date. It was a looking and reliable engine, and it Yamaha to remain competitive in a competitive market. Testifying to its the 650 twin remained available in the U.S. for a remarkable 13 model

While Honda and Kawasaki had to 4-cylinder engines for their 750s in the late 1960’s/early to mid Yamaha’s first 4-… 750 available in 1973/74 as the ill-fated twin. To recover from the TX, needed a clean slate and that’s what they in 1976 as the first XS750D a 3-cylinder 4-… 750. At the Cycle World magazine it a bargain BMW» and declared it one of the 10 best motorcycles.

Triples not new to motorcycling in the mid-1970s. Both and Suzuki were successful this period with 3-cylinder 2-strokes. I owned and a Suzuki GT380 Triple for than 40,000 miles the mid-1970s, and like most fans, longed for their big a powerful water-cooled 2-stoke As good as 2-strokes were, bike manufacturers were toward the 4-…. Like the British also found in the Triple.

Both BSA and the closely-related brands produced 750cc Triples. The last Rocket rolled out of the BSA factory in 1972, the Triumph Trident T150 was by the short-lived T160 in 1974 electric start, forward engine, front and rear By late 1976, the Yamaha XS was alone in the 3-cylinder 4-… market.

Yamaha added to the bike that further set it from its 4-cylinder 750cc like powerful triple-disc shaft drive and a stirring note that only a Triple could produce.

Hampered by points ignition, a low compression and mild cams, the XS750 performed well-enough, but the newness had worn off, the performance became passé. All changed for the 1978 model when the engine received a of significant improvements, which an increase in compression to 9.5:1, lift cams with timing, electronic ignition, overall gearing and the redline from 7500-rpm to 9000.

upgrades transformed the original XS750 Triple from a Clark Kent into a superbike (by 1978 standards). Due to changes made to the engine in years to address EPA emissions changes, the 1978 XS750 the best performing Triple.

The model-year also saw the introduction of the which retained the best of the standard model, but added mods loosely borrowed the Harley Sportster. Cruiser a teardrop fuel tank, seat, bobbed rear short mufflers and a leading-axle fork were mostly While the cruiser handlebars affected handling, on balance, the modifications didn’t.

The XS750 were produced from through the 1979 model with an estimated 150,000 production.

For 1980, the XS got a bump in to 850cc, an oil cooler was included, and stylistic mods were to the standard models to give a fresh look. The Specials even more cosmetic getting a swoopier seat and rear tire. One available scheme became the Midnight At least to my eyes, the MS was perhaps the attractive of the 850s, having a black monochrome appearance gold accents.

The engine, system, front forks and were all black. Gold was on the wheels, seat grab bar and detail components that had chromed on other models.

A 6 run, ending in 1981, the end of the Yamaha Triples. Yamaha on to 4-cylinder engines with the XJ series, and the XS750/850 Triple from the press. Today, the Triples remain in the hearts and of many vintage Yamaha simply because they so well.

They are Special.

to watch:

1- These bikes from the factory with a of vacuum-operated fuel petcocks. I’ve yet to experience a problem them on either my first or Special, they have known to develop a leak allows fuel to either to the carburetors while the engine is which can cause a flooded and/or contaminate the engine oil if the needle in one or more of the carburetors worn, or fuel can back-flow the vacuum hoses and run directly the intake tracts of engine.

This sort of failure contaminates the engine oil with Running the engine with engine oil usually wipes out the bearings. If your vacuum petcocks appear to be functioning a quick check of the engine oil through the convenient sight in the right-side engine case, every ride will any problem with the oil level.

XS owners have replaced the operated petcocks with a variety. While this end the possibility of a petcock failure results in engine oil contamination, it burden the rider with yet easy-to-forget task, and constant of the petcocks will wear the petcock seals, requiring routine maintenance. Vacuum rebuilt kits are currently

2- The transmission layshaft is held in with a bolt and thick washer on the right end of the shaft. The bolt has been known to which then allows lateral movement of the layshaft and gears. While this usually doesn’t result in serious damage, you may find 2nd gear won’t engage or stay in gear.

Some wear in the gear train or the drum for this problem, and changing the location of various to compensate. I believe the large and layshaft washer acts as a which fatigues the bolt time, eventually resulting in failure. Aggressive powershifting, or otherwise rough handling of the over a long period of may be the root cause of this

Profiling the heavy washer to its mass may help — at the center and thinner toward the edge. Neither of my Specials has this problem. I’m an shifter.

3- The Yamaha XS750 were originally equipped vented wet-cell 12-volt Too many of these bikes been ruined through the because of the destructive effects of corrosion — starting the battery box, the electrical and on down to the frame and swingarm. New AGM Glass Mat) batteries are now in most new bikes, and they are available for most vintage and motorcycles.

AGM batteries are vastly to the old batteries in that they a charge several times than wet acid batteries periods of inactivity and as a result longer, and they are non-vented so cannot leak in any position. of acid corrosion, Déjà’s box needed to be media-blasted and repainted after I got the bike. Luckily, was no additional damage.

Déjà now has an AGM battery.

4- Over a period of time, these can develop a slow oozing oil somewhere around the perimeter of the base gasket and/or gasket. Many of these can be dealt with by simply and re-torquing the cylinder head Air-cooled engines experience thermal cycles over which tend to relax the force applied by the head

A simple re-torque according to the Haynes or Clymer shop is easy and won’t cost you but your time.

5- It’s popular to replace the factory with a set of three slip-on KN air filters. Some owners do because their original had become mishapen or damaged time, and some airboxes are because the owners believe air filters will improve Don’t do it.

These engines are to an elaborate air pump. Maintaining air velocity is one way to improve performance, and air filters make no provision for the velocity of the intake air. The found inside the factory on the other hand, were and tuned to maintain intake air

The airbox was also designed to the intake air noise that can be when running individual air Installing a set of individual air filters a re-jet of the carburetors to compensate for the in airflow. Perfect air/fuel are almost impossible to obtain running individual air filters air pressure immediately behind the varies with road

The factory airbox pulls air an area of the bike that is less affected. Your will run better, will be and will produce better economy and more power running the factory airbox. If factory airbox isn’t a replacement can be found on eBay.

I a heat gun and gloved hands to the ill-fitting removable cover on my — to return it to its original

Press Reports:

All that with compression, valve exhaust systems, carburetion and has transformed the XS750 from the machine we tested in August (which recorded a best quarter-mile run of 13.94 seconds at mph) into a genuine, superbike (which laid a best run of 12.88 seconds at The Yamaha is quicker than any 750 and even quicker than 1000cc machines. Cycle October 1977

A unique configuration isn’t worth if the powerplant doesn’t perform, but the is at the very top of its class in useful performance. Cycle Guide, 1978

It turns out the Specials have enormously successful. Nearly of the 750 Yamahas sold are Specials. World, May 1979

Specifications 1979 Yamaha XS750SF

Yamaha XS 750

Engine type — four-…, vertical transverse

Valve arrangement — 2 per cyl, chain-driven double-overhead shim adjustment

Bore — 68 mm x 68.6 mm

Displacement 747.3 cc

Compression ratio 9.2:1

Claimed horsepower 68 bhp @ 8000-rpm

Claimed torque 47 lb-ft @ 6500-rpm

Ignition Transistor-controlled electronic ignition

— Three 34mm Constant Velocity

Air filter foam element

Lubrication Wet sump, 3.7 qt (3.5 L) capacity, pressure-fed plain main rod

Primary drive — chain 1.67:1 ratio

— 5-speed, 5.71:1 gear ratio in 5th

Rear — 4.00H18

Wheels 7-spoke tubeless cast

Frame — Tubular and mild steel, double front downtubes

Rake/Trail 26.5 degrees/4.29 in (105 mm)

— 59.5 in (151.1 cm)

— 521 lb (236.3 kg) dry (546 lb oil and — tank fuel)

vehicle weight rating 980 lb (444.5 kg), 459 lb (208.6 kg) capacity

Seat height 32.3 in (820.4 mm)

Instrumentation Speedometer, odometer, resettable tachometer

Warning lamps High beam, Neutral, Oil Warning, Turn Indicator, lamp fault, Tail fault, Head Lamp

Fuel tank — 4.9 gal (18.7 L), including 0.6 gal (2.3 L)

Petcock(s) — Vacuum Pair

Fuel consumption 40-50 mpg (17-22.5 km/L)

— 172-228 miles km) plus 24-32 miles km) reserve

Performance — to 13.33 sec @ 101-102 mph —mile and

120 mph top speed

Stopping distance 37 ft. (11.3 m) from 30 mph, 138 ft. m) from 60 mph

Yamaha XS 750
Yamaha XS 750
Yamaha XS 750
Yamaha XS 750

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