I read and liked your articles on two-strokes. I would like to see more. I have a question about my Yamaha YDS2: As you mentioned, compression ratio is an important factor. According to the factory, my bike has a compression ratio of 8:1. How high can I raise this and where and how much should I mill to get this compression ratio?
The California Motorcycle Dealers’ Association is currently in the throes of a highly interesting promotion that should lead the way in inspiring other like organizations in promoting motorcycle sales. They have recently inaugurated a dealer cooperative advertising campaign in the four leading newspapers’ sports sections in Los Angeles and San Francisco (with combined circulations of almost three million).
As an English rider said on Saturday, “It’s the weather that makes it tough, isn’t it?” The 37th International 6-Days Trial was over, two-thirds of the muddied participants would take home a medal and the Czechs had the Trophy for a year. The Garmisch run, which started out to be the most miserable in some time, tapered off under dry skies to be tough but possible.
THE HONDA MOTOR CO., LTD., is the most prolific producer of motorcycles the world has ever seen. Hardly a day passes that Honda does not introduce some new model, which must drive the dealers crazy, but is sure to delight the motorcycle enthusiast.
SUPREME CONFIDENCE would seem to be the prevailing attitude at the factory in Neckarsulm, Germany, where the NSU motorcycle is made. Certainly, the products from NSU show all the signs of having been designed with a fine disregard for what anyone else may be doing.
AS YOU HAVE READ in the series on two-stroke engines, there are basic principles which may be applied for improving performance. Many of you wish to know how these principles can be applied to your individual machine. The following gives specific detailed methods for modifying the Jawa 250 engine for road racing.
THOUGH IT WAS MANUFACTURED for only three years, 1916, 1917 and 1918, the Cleveland boasted of fea tures that would not be seen on motorcycles for years to come. For one it had the first unit engine/gearbox; also the spring frontfork was an innovation unusual for its day.
THE DAY started well enough with bright, clearing skies, the fairgrounds in beautiful condition, and even coffee ready when the gates opened. Last half-mile National Chapionship race of 1962, the 5-Miler held at Lincoln, Illinois was promoted by the Lincoln Motorcycle Club.
NOT a brief shower, but a near-tornado made muck of Chicago's Santa Fe short track on its regularly-scheduled Class A championship night, which caused a cancellation of the first date. The week's postponement forced several of the finest riders to cancel out, as well as many potential spectators who had planned their vacations around a Springfield-Santa Fe-Peoria jaunt.
BY VIRTUE OF his winning performance at Sacramento State Fairgrounds' one-mile dirt track, Bart Markel assured himself of the Number One plate in 1963, and tied Joe Leonard for the number of AMA nationals won in a single season — six. Markel, four-time Michigan state champ, had previously accounted for the 5, 10, 15 and 50-mile nationals as well as the 45 cu.
AFTER two days and 538 miles of rough going through Michigan's swamps, woods, rivers, gravel pits and sand, the finish of the 36th annual Jack Pine Enduro was decided, strangely enough, by a matter of seconds, with John Wright of Runny-mede, New Jersey declared the victor aboard his Triumph Tiger Cub.
THE Harley-Davidson Motor Co. in Milwaukee, Wisconsin, have announced their 1963 models ranging in size from 175cc up to the old familiar 74 cubic inch Duo-Glide. Among the most significant additions are two new 175cc lightweights, the Pacer and Scat, both with a new swinging arm rear suspension employing a pair of coil springs running lengthwise under-neath the engine and gearbox.
RIDING to his second straight National Heavyweight TT Scrambles Championship, Triumph-mounted Leroy Guthrie from Greenville, South Carolina, toured the Edgewood (Md.) Raceway Park course in true championship form. Taking the lead from Matchless rider Clarence Ulmer about midway through the 25-lap race, Leroy's only remaining threat was from runnerup and fellow Triumph rider, Charlie Vincent of Simsbury, Connecticut, whose steady charging brought him to within a few seconds of the leader at the finish.
CASUAL, easy going Santa Barbara, California really packed in the AFM (American Federation of Motorcyclists) road racers, with the pits containing what looked like a record entry. The occasion was the running of the annual California Sports Car Club's Labor Day weekend of sports car racing at the Goleta airport and the bikes are becoming increasingly prominent.
THE place, Sachsenring — the event, the East German Grand Prix which was another event in the World Road Race Championship series. But this was a meeting with a difference for with over a quarter of a million spectators watching, the all-conquering works Honda machines nearly met their match in the 125 and 250cc races against the local East German M.Z. machines.
THE 120-Mile National Championship road race at Indianapolis, Indiana provided an exciting finish to the Midwest portion of the AMA championship circuit. Promoter J. C. Agajanian added indoor shorttrack races to the full weekend of competition, and both riders and spectators were pleased by some of the finest motorcycle rivalry of the year.
Poly Oxide lubricating oil is a pure synthetic lubricant and a complete twocycle engine lubricant. It will leave almost no carbon deposit and use results in almost perfectly clean combustion chambers and pistons, the maker claims. Other claims are that its film strength is greater than castor oil, it will mix with either gas or alcohol fuels, will not separate in cold weather, eliminates cleaning of mufflers and exhaust stacks. Cycle Supply at P.O. Box 982, Concord, Calif., is the maker, the price is $1.95 per quart, and dealer inquiries are invited.
Similar to the normal black leather riding shirts but more suitable for general riding. This vinyl leatherette looks like genuine leather and wears almost as well. Features four zipper closing pockets and two side slash pockets. Rayon lined, available in all popular men’s sizes. #623-VB bone color, $23.50, #622-VR black color, $21.50. From Milne Bros., Dept. CW, 22 N. Greenwood, Pasadena, Calif.
Bungee cords of braided elastic with plastic covered metal hooks will hold almost anything on the luggage rack or seat of a motorcycle. An ideal accessory for the traveling enthusiast because it simplifies the carrying of luggage, clothes, packages, etc., the price is only $2.50 for four, from Steen's, 939 West Valley Blvd., Alhambra, California.
AGV ULTIMATE HELMET
The new AVG “Ultimate” helmet is now available, approved by the AMA for Group 1. It features a newly designed high-impact fiberglass shell, reinforced with nylon mesh, and a resilient cork inner shell. AGV’s up-to-date research laboratory says they have proven that only a resilient type of liner can offer maximum protection against multiple blows of some accidents. The A-l helmet sells for $25.95, and the A-2 with flip-up visor is $29.95. Distributed by Cosmopolitan Mtrs., 5521 Wayne Ave., Philadelphia 44, Penna.
CAR CARRIER FOR CYCLES
A new universal cycle carrier that can be mounted on a standard trailer hitch of any vehicle has been anounced by the Hap Jones Distributing Co., 2 Clinton Park, San Francisco, Calif. Built of tough, cold rolled steel and chrome plated to match the bumper and car trim, the Universal Cycle Carrier can be adjusted to carry any size motorcycle, scooter, or off-the-highway cycle. For bicycles, a double wheel well arrangement is available that permits two bikes to be packed on the carrier. It attaches to the trailer hitch by removing the ball, and a support bolt of 50,000 lbs. tensile strength is furnished. Catalog information is also available.
When writing advertisers in your magazine, I always say, “I saw it in CYCLE WORLD.” Sure wish I could say the same about this letter. GEORGE MC CLUSKEY Millinocket, Maine I am in a bit of a huff over a letter in the September CW; it is from a Mr. A. J. Farmer.
TWO MEN dominated the Italian meeting of the world road racing championship: they were Mike Hailwood and Tarquinio Provini. Mike is well known to all for his exploits at previous meeting this year but the wiry and wily Italian unfortunately has not been seen much this season as Morini, for whom he rides, have not contested the world title.
ONLY THOSE HE LAPPED got a good look at Carroll Resweber during the 75-mile Tobacco Trail Classic road race at Marlboro, Maryland over the Labor Day weekend. To nobody's surprise, the wiry Grand National Champion ran away from the field in a record track time of one hour, 9 minutes, 36.52 seconds.
PRIDE OF PLACE this month could not possibly be given to any news from Europe when at long last under F.I.M. supervision the motorcycle speed record has been broken and the speed of Herz on the N.S.U. superseded in the record book by Bill Johnson.
NATIONAL Championships have held the scene for the past few months, starting with the National Championship Scramble held at Copetown, Ontario and run by the Steel City Riders of Hamilton. In this event, as in most Canadian races, riders from the U.S.A. scored considerable successes.
WEARING National Number 8 for the first time this season after sporting 8x for several years, Stuart Morley is always a crowd-pleaser with his sensational corner sliding and flat-to-the-tank straight-away position, as well as being a dirt-tossing nemesis to his harried competitors.
THIS handsomely illustrated book will be of great interest to all enthusiasts, whether they be afficionados of racing or merely week-end scooterists. John Surtees, seven times World Champion, winner of the Isle of Man "double" for two successive years and now a top line racing car driver, tells his story from school days, when he first raced in the "chair" of his father's sidecar rig, to the time of his unparalleled success on the MV. He recounts his most memorable races, takes the reader on a conducted tour of the world’s great race courses and discusses both old timers and his contemporaries.