We recently advertised our new motorcycle club with a poster-carrying car escorted by four bikes in a "Spring Week" parade at Penn State University. Among our club policies are better public relations. Take note of the bottom lines of the poster in the enclosed picture.
Readers are invited to have their say about motorcycles they own or have owned. Anything is fair game: performance, handling, reliability, service, parts availability, funkiness, lovability, you name it. Suggestions: be objective, be fair, no wildly emotional but ill-founded invectives; include useful facts like miles on odometer, time owned, model year, special equipment and accessories bought, etc.
I was quite interested in "The Violation of an Ossa" article by Eric Raits which appeared in the April, 1971 issue of CYCLE WORLD. I have a 230-cc Ossa Pioneer which has a few problems, mostly with the IRZ carburetor. For some reason, the factory-installed rubber float bowl gaskets leak once they have been removed and reinstalled, even though they seal very well before the carburetor is dismantled.
A little guy with funny pointy-toed shoes came to visit me one day at the old CW office in Long Beach. No muss, no fuss or phone calls; he just walked out of the beehive we call Los Angeles airport, found a bus with Long Beach on the front and proceeded down to our office.
How Does It Handle, How Does It Go? We Rode Kawasaki's New Big-Bore Three And Found Out!
750 MACH IV
KAWASAKI UNVEILED a new "super-sickle" at a bubbling, wobbling press preview inside and outside the Queen Mary, formerly of Liverpool, now of Long Beach. Both the 750-cc Mach IV and the Queen Mary survived intact. While everyone was betting that Kawasaki would go to a four-stroke when they decided to upstage the former leader of the line, the 500-cc Mach III, it didn't work out that way.
HARLEY-DAVIDSON gets the Lavishness Laurel this year, having set their press preview in the Bahamas. It was so idyllic that we almost didn't bring back pictures. Most interesting for road riders was the introduction of a new 1000-cc Sportster ohv V-Twin in electric and kick-start versions.
FACES IN THE BSA/Triumph camp have been understandably long, as the sales demand created by the effective new program of the American distributor was shot down late in the year by Mother England's inability to produce enough bikes to fill the seasonal "pipeline," as they call it.
THE ORIGINAL SAVAGE never set fire to the off-road camp, somehow. It was a nice enough dual-purpose motorcycle but, due to excess weight (299 lb.) and a certain amount of clumsiness, was unable to win the hearts of serious boondockers. Suzuki has now reconsidered the market.
THE NON-NATIONAL Livonia mile held last year drew unusually favorable comments for a track: a super cushion mile, no dust, and some of the best racing anywhere. That was last year. This year's 20-lap national championship race was anything but satisfactory.
Wherein, "Corrected" Compression Ratio Is Exposed For What It Is, A Marketing Gimmick.
COMPRESSION RATIO DEFINED
EFFECTIVE COMPRESSION RATIO
RELATION BETWEEN R AND RE
EXHAUST DURATION/ROD LENGTH
YAMAHA OR BULTACO?
HODAKA HOP-UP OR HOP-DOWN
WHAT'S IT ALL ABOUT?
YOU GOTTA HAVE FAITH
"RE" IS A SALES GIMMICK
COMPRESSION RATIO IS one of the basic parameters of engine design and performance. It interacts with fuel type and octane, with combustion temperatures and pressures, with maximum power and the spread of power at different rpm, with the speed and smoothness of burning, with port and ignition timing, with combustion chamber geometry, and with the chemical composition of the exhaust—a major consideration in these days of concern about air pollution.
A Stud Bike With A Starter, And One Helluva Stopper!
YAMAHA, BUILDERS OF some of the fastest two-cycle motorcycles in the world. surprised the American motorcycling public late in 1969 with the introduction of the XS-1, a large-capacity tour-stroke laid out in the "English tradition" with two vertical cylinders and an alternately firing, 360-degree crankshaft.
Behind The Sprawl-Urban Facade, The Bikes Are Everywhere, Even Hidden Behind Bushes. The Patio, Once The Place To Sip A Coors, Is Now The Home Of Monarch, Marvel, Armac & Pope.
OFF IN ONE dark corner, tightly wedged between a Cleveland and a Reliance, you spot the word THOR scripted across the rectangular gas tank of a somewhat rusted, yet amazingly complete, motorcycle that looks more ancient Schwinn than early Harley, and you ask Lyle Parker about the bike's origin.
IT IS HIGHLY UNLIKELY that you will be able to buy this particular model at your local motorcycle shop. In fact, it is hard to find a fellow motorcyclist who will buy one, let alone sell one. But followers of this highly unusual mode of transport are many in number, and develop a high degree of enthusiasm for them, and, in some cases, something akin to love.
Taking Advantage Of The AMA's 350/250 Road Racing Formula, Kawasaki's Back-Room Boys Whip Up A Potential Yamaha Beater.
THE "CLASS C" SPIRIT
THE 350/250 RULE
THE NEW RULE'S EFFECT
THE BIGHORN 350
FRAMING THE BIGHORN
PORTING & CARBURETION
THE BIGWIGS in charge of making rules in the American Motorcycle Association seem to do crazy things sometimes. On the surface, it would appear to be unfair to let certain types of 350-cc machines road race with 250s. But that's what the rule is, and, in reality, it makes for more competitive and more entertaining racing.
A NEW TYPE OF PRIMARY CHAIN WITH GREATER EFFICIENCY, LESS NOISE AND VIBRATION, AND IMPROVED RELIABILITY
ORIGINALLY DESIGNED in the late 1940s as a solution to the high-speed, high-load requirements of heavy oil drilling equipment, the Morse Hy-Vo chain has recently been incorporated into the drive train of the front-wheel-drive Oldsmobile Tornado and Cadillac Eldorado.
CHARLIE DENHAM HAD no reason at the moment not to be joyous, even blissful, with his first big-bore ride. The California surf line offered its pleasant blue-white accompaniment on his left, and the early summer sun reflected warmth and sparkle from the chrome bars and red tank that he had polished so carefully the night before.
THE BATTLE TO SAVE OUR LAND (AND OUR EARS) IS BEING FOUGHT BY HOOKER HEADERS — WITH AN INCREASE IN HORSEPOWER THROWN IN FOR GOOD MEASURE.
HOOKER HEADERS, the world's largest manufacturer of automotive exhaust systems, seems like an unlikely place to find two-stroke expansion chambers-cum-mufflers pouring out at the rate of 350 per day. But it is real. Under the leadership of Rick Vesco, younger brother of former motorcycle land speed record holder Don Vesco, the motorcycle division of Hooker has grown tremendously in the past 18 months.
A Traveling Lock-up For Your Bikes That Is Fast, Smooth And Quiet.
ABOUT 54 PERCENT of our readers own some sort of transport for their motorcycles, and 14 percent own vans in particular. While pickup trucks have been more popular than vans in the past, the recent improvement in the design of vans has made them a much more attractive proposition.
FOR HARMONY IN THE SADDLE, SHOW THIS TO YOUR OLD LADY.
MOTORCYCLE SEATS will generally carry two persons in varying degrees of comfort, and for the most part, the passenger is usually female. As a female who has often occupied that position and has many miles of experience, I would like to offer some advice to female cyclemates.
THIS IS a ya-gotta-have-a-gimmick world. Right? Then what does a straightforward, super-simiple minibike like the Heathkit Hilltopper have going for it? Ah, straightforward and super-simple—price must be the gimmick. Wrong! At $299.95, without the optional lights or front ski, the Hilltopper is competing directly with more sophisticated micro-cycles like the SL70 Honda or Yamaha's Mini Enduro.
How American Metal Triumphed In The Great Brooklands Fargo Of '21.
HOTSHOES AND NO-ACCOUNTS
LE VACK VS. DAVIDSON
THE SHOWMAN'S TOUCH
MAY BE A HALF century ago this year, a premonition warned H.F. Brockbank that Brooklands, Britain's only paved race track, would be crumbling to rubble before it ever saw another 500-mile motorcycle race. Brock evidently was determined to get value for his entry fee while the going was good.
Englishman Dave Bickers (CZ) won the fifth event in the AMA-sanctioned 250cc Summer motocross series held on a grueling, rain-soaked course at Honda Hills near Linnville, Ohio. During his 22 years of racing, Bickers has gained a reputation as a goodwill ambassador for British motorcycling.
Individually tailored motocross pants are offered by Bates Industries. The top-grain cowhide constructed pants are available in 24 colors and 6 shades of rough-out. Other construction features include full lining, leg zippers, three zippered pockets, built-in belt and special padding incorporating rubber and felt for greater shock absorption. Suggested retail price is $69.50. A chest protector is also available in all of the colors of the pants. A special foam product is used inside the leather for rider protection. The price for the vest is $14.95. Both pants and vest may be ordered through most motorcycle dealers, or write Bates Industries Inc., Dept.CW-11. 701 W. Cowles St.. Box 2668. Long Beach, CA 90801.
Bates Industries Inc.
HONDA FOUR ENGINE STAND
Gemini Metal Products has an engine stand available to facilitate assembly of a Honda Four engine. The 17-lb. stand, constructed of 3/8-in. cold rolled steel, heliarced and nickel plated, mounts securely in a vise. Other features include a full 360-degree rotational ability, and a design which includes three access holes at the base for inserting and tightening the 10 crankshaft bolts in sequence. The stand can be solidly locked either by hand or by tightening the lock nut with a wrench. Price, which includes mounting hardware, is $59.95 plus $5.50 for shipping. Order from Gemini Metal Products, Dept. CW-11, 930 S. Holt Ave., Los Angeles, CA 90035.
Bates Industries Inc.
QUIET OSSA CHAMBERS
A quiet expansion chamber, which is claimed to offer a street legal tone, improved low end torque, and no loss in top end performance, is available through Bassani Manufacturing. Built for the Ossa 250 Stiletto, its features include a fully perforated metal heat shield and a competition black finish. The stinger encases a silencer and an additional rebuild kit. Price is $60, complete with all mounting hardware, and the unit may be ordered from Bassani Manufacturing, Dept. CW-11, 1164-C Fountain Way, Anaheim, CA 92806.
Bates Industries Inc.
For desert and motocross riders concerned with handling problems on their machines, K&G Engineering will perform frame modifications to extend the wheelbase, and lower the center of gravity. K&G requires only the stripped frame for their engine lowering, wheel spacing treatment. Initially, the procedure is to slide the frame in two, just above the swinging arm. Then steel inserts are welded in place, lowering the engine cradle and swinging arm pivot in relation to the rest of the bike. Two new cross braces and several gussets are added to make the frame more rigid than the original. The steel spacing slugs are welded both at the outside joint and at the ends for added strength. The end result yields a 1-in.-lower engine, a wheelbase stretched about an inch and a swinging arm parallel to the ground under normal load. No further modifications are necessary to compensate for the initial modifications performed. For Yamaha DT-1s and RT-1s, the cost of this treatment is $49.95; it varies slightly more or less for other bikes. Some models of Kawasaki and Suzuki can also benefit from the modifications. For further information, contact K&G Engineering, Dept. CW-11, 2353 San Fernando Rd., Los Angeles, CA 90065.
Bates Industries Inc.
QUICK DRAIN CARB VALVE
A Quick Drain Valve, designed and engineered for Yamaha and Hodaka motorcycles, is available which is claimed to clear a flooded engine in seconds. With this product installed, it is only necessary to shut off the petcock at the gas tank, depress the Quick Drain Valve until the float bowl is empty, and kick the machine over. Total time: approximately 10 sec., instead of the possible 10 min. or longer. After washing your motorcycle, should water or some other foreign material get into the bowl, just depressing the valve with the petcock on at the gas tank will flush out the water and what other matter is stuck in the bowl. If your motorcycle is being stored, clogged jets due to residue build-up can be prevented by shutting off the petcock at the tank, depressing the valve, and removing any gas left in the bowl. For quick jet changes, shut off the petcock at the tank, depress the valve and remove any gas left in the bowl; this eliminates the problem of having gas run all over the engine during these changes. Composition of the valve is precision machined brass with cadmium plating. It is equipped with a special oil and gasoline-resistant O-ring. Should the O-ring wear out over a 3- to 4-year period, a stop clip is built into the valve to prevent the mechanism from flying out. The O-ring can easily be replaced for just a few cents. The BBP-001 valve fits the 90-cc, 125-cc and 175-cc Yamaha Enduro and MX models and the Hodaka Super Rat. Price is $5.75. The 250-cc and 360-cc Yamaha Enduro and MX models can be fitted with the BBP-002 valve, priced at $5.95. These valves will also fit any Mikuni carburetor with an external main jet holder. State carburetor size in mm's when ordering. For additional information, contact Burak-Bye Products, Dept. CW-11,15170 Raymer St., Van Nuys, CA 91405.
Bates Industries Inc.
REED CAGE ADAPTER MANIFOLD
Hodaka Super Rat owners can opt for a reed cage timing conversion with G.E.M. Products' new adapter manifold. Claimed improvements resulting from using the adapter, which includes the reed cage and pedals, are cleaner running, more power and flexibility from idle to full throttle. Installation of the adaptor is claimed to give a better overall engine performance because it provides the engine with a more accurate load of fuel under all operating conditions. It is not necessary to replace the stock Super Rat carburetor, although, as with all reed cages, the piston must be drilled ("windowed") on the intake side of the skirt to directly expose the reeds to varying crankcase pressures. Instructions for this, plus all the necessary items to complete the conversion, are included in the $21.95 purchase. For further information, contact G.E.M. Products Inc., Dept. CW-11, 496 E. St. Charles Rd., Carol Stream, IL 60187.
Bates Industries Inc.
"LESS SOUND" EMBLEM T-SHIRTS
To further the campaign for less sound, more ground, Arcadia Graphics, Dept. CW-11, Box 3046, Arcadia, CA 91006, is offering "Less Sound Equals More Ground" emblems to affix to T-shirts and sweatshirts. Each sheet, priced at $1.50 postpaid, contains two emblems, one 7-in. for the back-shirt area and a 3-in. for the pocket area. The two-color green emblems are made of long-wearing, fade-resistant, rubberized ink.
Bates Industries Inc.
Kosman Specialties has announced a loose-leaf catalog that brings its array of exotic racing goodies up to date. These items are primarily of interest to riders engaging in various forms of competition in which high quality components must be used. A partial rundown of the list includes: Alloy racing wheels, reversible and interchangeable; rear-wheel quick change sprocket adaptors: double-disc front brake kits; single-disc rear-brake kits; heavy duty oil filter kits for four-stroke machines, etc. Pictured are the disc brake kits, the front for $129.95 and the rear for $79.95. The proprietor, Sandy Kosman, has access to many other hard-to-get racing accessories, such as frames, special tanks, etc. Write Kosman Specialties at 340 Fell St., Dept. CW-11, San Francisco, CA 94102.
The new version of Yamaha's ultra-lightweight street sports model is called the 90 HX. It features the same overall design as its bigger brothers of the series. And as compared with its forerunner HS 90, overall length has increased to 74.4 in.
Twelve different meetings scattered around Europe comprise the world 500cc motocross title chase, and this year the points race has remained close all season. Now, with only two rounds to go, the field has narrowed to three contestants, as Bengt Aberg, champion for the past two years, is no longer in contention.
One of Italy's largest motorcycle manufacturers, Benelli, has been in debt for quite some time. Apparently their old-style family management with too many executive conflicts has not been able to keep pace. Benelli, however, will survive, thanks to the ford-owned De Tomaso sports car factory which has offered to take over the Pesaro firm.