1971-74 Harley-Davidson Sprint SX350 — Classic American Motorcycles…

23 Мар 2015 | Author: | Комментарии к записи 1971-74 Harley-Davidson Sprint SX350 — Classic American Motorcycles… отключены
Harley-Davidson SX 250
Harley-Davidson SX 250

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Sprint SX350

Claimed 25hp @ 7,000rpm (1971)

Top  90mph

Engine:  344cc OHV horizontal single

Weight  312lb

Price then/now: (1971)/$2,400-$4,500

It’s a simple and recipe. Take a street-standard fit trail-type tires, scrambles and a high-level exhaust system, and — presto! — your road becomes a mud-plugging enduro or Of course, most street weren’t true offroad — but they looked like

And the look was hot.

All this sense to Harley-Davidson in 1971. 350SS street bike was outclassed by Japanese twins of the capacity, so to squeeze a few more out of the ageing Aermacchi design moved the 350 single into a where standing quarter and racetrack handling were important.

The first generation SX350 was little more than a street bike dressed up for the It retained the street bike’s spine frame with the slung below. For added the rear subframe and suspension to a pair of forged members what had been tubes: maybe, but definitely heavier.

rear and 19-inch front were fitted with knobby offroad tires under abbreviated, high-mounted blades. A smaller gas tank and seat were fitted, and was the street bike’s tachometer, with the dated binnacle it in. High, cross-braced handlebars and a muffler with wire shield finished the street-to-dirt

Underneath, not a lot changed. The Harley-Davidson SX350 retained the drivetrain and components from the SS, including the bike’s long-… 74mm x pushrod 4-… single, continued to drive a 4-speed through a gear primary and dry clutch, with chain to the rear wheel. Shifting was on the as was the kickstand, and the kickstarter was on the left — that took American some getting used to.

Cycle Guide started its 1971 review on the SX350 by “if there is a more rugged motorcycle than the new Harley 350cc Sprint, we haven’t run it.” But that ruggedness at a cost in weight: At 312 pounds Cycle Guide considered the SX to be 100lbs heavier than its with a full tank of (Though they didn’t what that competition a same year Bultaco 350 weighed a claimed 211 pounds.) also found that if the SX was sitting idle several at a time. it then became to bump start it.” Not a commendation.

But the biggest problem the Harley-Davidson Sprint SX350, Guide said, was its basic With longer suspension the street version, the engine’s was now above the level of the wheel meaning the center of gravity was too That, they said, the SX “difficult to handle in tight Overly stiff shocks help, although the editors the bike’s Ceriani forks, they were “soft and a comfortable ride.” And while on the pegs improved offroad it then became almost for the rider to operate the shift But more seriously limiting the offroad pretensions was engine There wasn’t any. worse than that, the pipe hangs down the motor,” Cycle Guide making it “no problem to destroy an pipe if you encounter an obstacle of any at all.”

In 1972 Harley-Davidson (now AMF control) bought the remaining 50 of Aermacchi it didn’t already own and a chunk of change to update the and 350SS. A new double cradle meant the SX’s engine and were offered some while electrics went to 12 from 6, meaning an electric could also be added. And the kickstarter was still on the left, it was by the shift lever and kickstand, of which had previously been on the

All this effort was largely as only around 11,000 Sprints of all guises (street and were sold over Japanese 2-… twins had way performance for way less money. H-D to agree, because they the Italian subsidiary toward the race bike program, rewarded them with 250cc world championships in and the 350cc title in 1976 Walter Villa in the saddle.

The 350 was for 1975, and the Castiglioni brothers the remains of Aermacchi motorcycles and the factory in 1978.

Contenders: Street-enduro rivals to the Sprint SX350

Ducati 350

Claimed power: 24hp @

Top speed: 80mph top speed

Engine: 340cc air-cooled SOHC 5-speed

Weight: 293lb

Harley-Davidson SX 250
Harley-Davidson SX 250

Price then/now: $750

The first new wide case singles introduced for 1968 the 250cc and 350cc Scramblers. like the SX350 and Honda’s the 350 Scrambler was more about show than go, with a front wheel wearing a tire and still sporting a exhaust. Only the high and handlebars — and slender fenders — at off-highway work.

Under the though, was a thoroughbred Ducati (spring valve, not desmo) overhead cam engine with a gear driving a wet multiplate and 5-speed transmission. A 27mm carb supplied fuel, by contact breaker and 6 volt The power unit slotted a conventional single downtube with 35mm Marzocchi forks and three-way adjustable controlling the swingarm rear.

were 8-inch front and rear single-leading-shoe drums. A for 1973 introduced a 29mm carburetor, aluminum wheel a double-sided front brake and ignition.

Spring-valve, wide case may be the most reliable early and the easiest to live with. than narrow case the engines earned a reputation for durability, and the relative simplicity of the top end meant easier maintenance — valves still required adjustment. The 350 was perhaps the better capacity, too, with torque than the revvier and using essentially the same parts.

1968-1973 Honda

Claimed power: 33hp @

Top Speed: 100mph top speed

325cc air-cooled SOHC twin, 5-speed

Weight: (wet)

Price then/now:

The new for 1968 CL350 Street used an all-new 325cc 4-… parallel twin. A drove a single overhead cam by a featuring bonded rubber to reduce noise. Progressively valve springs reduced loads and valve seat while valve adjustment was as as loosening a locknut and rotating one of the eccentric rocker shafts.

The diameter pistons ran in pressed-in liners in a light alloy block. Primary drive was by dual straight-cut gears to noise and gear lash to a wet clutch and 5-speed constant-mesh all fitted in a horizontally split, crankcase. Keihin constant-velocity carbs delivered the fuel, a new intermediate fuel/air circuit to more accurate fueling

Intake ports were to optimize gas velocities over a rev range, as were the small-diameter, header pipes. The result was 33 at 9,500rpm and plenty of torque the rev range.

The frame was typical a sturdy pressed-steel top member and tube cradle with forks and dual shocks. were 8-inch twin-leading-shoe and 6-inch single-leading-shoe rear. its 2.4-gallon fuel tank the CL350 tipped the scales at 346 and was good for 100mph.

Cycle tested the first CL350 in May and found almost nothing to it on; they speculated the CB/CL350 just be the best motorcycle built.  MC

Harley-Davidson SX 250

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