The cc displacement advertised as cc was derived from a 3. Both connecting rods shared a common crank pin, referred to as a 'knife and fork' design. Each valve was operated by its own cam, simplifying valve train geometry. The new overhead-valve motor, fitting neatly under the gas tank, sported twin cylinder jugs sitting 45 degrees apart, topped off with a pair of cast-iron cylinder heads.
One carburetor fed both front and rear cylinders. It wasn't until the Evolution Sportsters came out in that the older models were referred to as "Ironheads".
The Sportster bottom end was nearly the same as the Harley K-Series flathead motor. Inside the rear of the engine cases housed a four-speed transmission , which was so robust, it would see service through all the Ironhead years, as well as seeing use on early Evo Sportsters. Aside from the engine, most components of the Sportster were carried over from the Harley K-model , including frame, fenders, wheels, brakes, gas tank and suspension.
The large headlight used on XL and XLH models in and was basically a pre Panhead unit with an oil and generator light added in the bucket. The first-year Sportster saw many changes during the production year, and have several unique features. Early models didn't have cylinder head rocker bushings like later models did, and used tappet rollers without needle bearings. The passenger foot-mounts were also one-year only, as was the carburetor Linkert DC Aluminum is usually the preferred material for cylinder heads - not only is it lighter than cast-iron, it also dissipates heat better.
Harley-Davidson had previously used aluminum heads on their Big-Twin Panhead motor, which helped reduce engine operating temperatures in warm weather. But early Panhead riders experienced top-end problems, so the Motor Company cautiously chose cast-iron for the Sportster heads. Concerns of engine overheating kept the compression ratio of first-year Sportsters at a conservative 7.
Later cc bikes had compression ratio. Making 40 horsepower and weighing pounds, the Sportster XL was not yet burning up roads. In , the XL received new fenders and headlight nacelle, and ignition switch mounted on the left fork. A second model, the XLH, was basically the same bike as the XL, but with the "H" denoting a higher compression engine with larger valves.
Power increased significantly. The XL remained the standard model with a milder compression ratio. The "locomotive" style headlamp nacelle was introduced on the XLH in and was used until A third model, the XLCH, was also offered in Originally set up as an off-road bike, it was sold with no headlight or taillight and had twin straight exhaust pipes and knobby tires.
XLCH's had 1" more ground clearance than the other models. A small 2. To save weight, the CH model had no battery or coil, and had a magneto ignition. A horseshoe-shaped oil tank was fitted in place of the battery. Both the CH and H engines used the same cams.
The XLCH model proved quite popular, and in , lights, mufflers, and full fenders were fitted. The left-handgrip spark advance was still retained. Along with the peanut fuel tank, bobbed rear fender, and magneto ignition, the XLCH was also fitted with a high level exhaust pipe. Although originally fitted to only models, they will fit any short-frame XLCH. Early Sportsters with high-pipe exhaust are ultra rare today, as many people removed and replaced them with more traditional dual pipes.
Several specialty companies, including Gasbox and Sporty Parts, offer reproductions of these, but they are not always available. Different heads and cams were used, and ball-bearings were used at the crankshaft ends to reduce friction.
Produced in limited quantities, a properly tuned XLR could put out horsepower. Just rumor perpetuated through time. The Harley factory has not ever said what the designations stood for. Just look at it this way: If you see a Sportster with an electric starter on it, then take it as an XLH model. It is not a CH. If you need verification on that, go to the engine number and see if it is a '3A or a 4A'.
If you are looking at the 's, then a fair portion may be XLCH bikes, but sadly there are less and less of those great old machines left because after all this time they have been chopped, butchered up and have wound up in a 3 wash tub as a bucket of parts being sold piecemeal at a swap meet somewhere. Yeah, I know, I am opinionated. Last edited by weeksz; at PM.
It's definitely a Honda. Unless someone added the electric start possible, but not likely it is an XLH. Billy Mcguff July 18, at pm. Yeah mine is CAH. So what about. YouMotorcycle July 19, at am. CA is XLH. What year is it, Billy? I just added a bunch of new models to this. My year is YouMotorcycle May 21, at am. Jerry June 4, at am.
YouMotorcycle March 13, at am. It starts with CAP? YouMotorcycle June 15, at am. Please give your local Harley-Davidson dealership a call. YouMotorcycle June 13, at am. Pat April 19, at pm. Mine says CJM? Any help would be appreciated. YouMotorcycle May 4, at pm. Could you let us know what the year is please? Jennifer biggs October 4, at pm. YouMotorcycle June 2, at am. Alan August 13, at pm. YouMotorcycle August 13, at pm. Hey Alan, have you tried calling a Harley dealership?
Alan September 4, at pm. See updated list above. Aaron September 4, at pm. YouMotorcycle September 4, at pm. Are you concerned it may not be the stock engine? YouMotorcycle December 27, at pm. Buddy January 25, at pm. Wolfy May 22, at pm. Jacob April 19, at pm. YouMotorcycle April 20, at am. W Cullen April 8, at pm. Brandon Schoenthal June 3, at pm. What do you think. My vin reads 1 HD 1CG. What kind is it. Ralph Crowe June 17, at pm.
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