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| techtalk:ref:xmodels10 [2025/07/02 07:11] – [XR-750 Technical Categories] hippysmack | techtalk:ref:xmodels10 [2025/07/06 01:14] (current) – hippysmack | ||
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| ====== REF: Extra Models10 ====== | ====== REF: Extra Models10 ====== | ||
| - | ====== XR-750 | + | \\ |
| + | ====== XR-750 | ||
| + | ===== Engine VIN Coding ===== | ||
| + | {{: | ||
| - | * [[:ref:xmodels11|Engine | + | ===== About Factory Original XR-750 Bikes and Parts ===== |
| - | * [[:techtalk:ref:xmodels11|Engine Mechanicals – Top & Bottom End]] | + | From Dr Dick of the XLFrum: \\ |
| - | * Carburetor, Intake Manifold & Exhaust | + | {{ |
| - | * Electrical, Ignition, Charging | + | An original XR is like the original greenback. Who ever had it used it and now it's no longer in original condition even though it's "the original" |
| - | * Transmission | + | an original frame is kinda like the original homerun record or the original land speed record. The original record is zero. |
| - | * Clutch, Drive Train | + | When you have a racer you need to learn the heritage (time line) of the sport at time of machine retirement. Then you self-educate on the who, what, when, and most importantly the why your piece of history is in the dress it's in. That takes place of the street bike " |
| - | * Suspension, Wheels, Brakes | + | Not sure if this was just the 72's or if the 75's were also assmed. It seems that the 77's and 80's could be bought complete but unassmed. After that, HD stopped selling complete bikes and directed you to outside suppliers (for all except the motor). All thru the run, outside vendors were contracted for making new OE stuff. There is a print (right) of one of the frames. |
| - | * Frame, Body, Handlebars | + | |
| - | * . | + | \\ \\ \\ \\ \\ |
| - | * Miscellaneous | + | ====== Specs / Features ====== |
| + | ===== 1972 ===== | ||
| + | New redeigned 750cc engine with aluminum cylinders and heads. Also had new valves, pistons, rods, flywheel assm, " | ||
| + | * Engine | ||
| + | * Carburetion: Dual 36mm Mikuni carburetors and specially designed air filters | ||
| + | * Exhaust System: Tuned duals with reverse-cone megaphones | ||
| + | * Bore and Stroke: 3.125" x 2.983" | ||
| + | * Displacement: | ||
| + | * Compression Ratio: 10:1 | ||
| + | * Max RPM: 8000 | ||
| + | * Clutch | ||
| + | * Primary Drive: 25 tooth engine sprocket, 59 tooth clutch, triple row roller chain | ||
| + | * Rear Drive: 16 tooth transmission sprocket, 40 tooth rear wheel sprocket | ||
| + | * Overall Drive Ratio: 5.90:1 | ||
| + | * Transmission: | ||
| + | * Transmission Gear Ratios: | ||
| + | * 1st 2.09:1 | ||
| + | * 2nd 1.51:1 | ||
| + | * 3rd 1.14:1 | ||
| + | * 4th 1:1 | ||
| + | * Weight: 295 lbs | ||
| + | * Tires (front and rear): 4.0 x 19 on aluminum rims | ||
| + | * Front Forks: Ceriani with 4.40” travel and aluminum fork bracket | ||
| + | * Rear Shocks: Girling hydraulic racing shocks | ||
| + | * Gas Tank: Fiberglass construction with 2-1/2 gallon capacity | ||
| + | * Oil Tank: 3 quarts | ||
| + | * Electrical: Fairbanks-Morse magneto | ||
| + | * Color: Jet Fire Orange | ||
| + | |||
| + | \\ | ||
| + | \\ | ||
| + | [[: | ||
