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techtalk:ref:xmodels10 [2025/07/02 14:48] – [XR-750 Technical Categories] hippysmacktechtalk:ref:xmodels10 [2025/07/06 01:14] (current) – hippysmack
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-[[:techtalk:ref:xmodels|{{  :techtalk:gotoxtramodelindex.png|}}]]  
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-====== REF: Extra Models10 ====== 
 [[:techtalk:ref:xmodels|{{  :techtalk:gotoxtramodelindex.png|}}]]  [[:techtalk:ref:xmodels|{{  :techtalk:gotoxtramodelindex.png|}}]] 
 ====== REF: Extra Models10 ====== ====== REF: Extra Models10 ======
 \\ \\
 ====== XR-750 General Information ====== ====== XR-750 General Information ======
 +===== Engine VIN Coding =====
 +{{:sportster_history:xr-750_engine_vin_chart_by_hippysmack.png?direct&600|}} ((Drawing by Hippysmack)) \\
 +
 +===== About Factory Original XR-750 Bikes and Parts =====
 +From Dr Dick of the XLFrum: \\
 +{{  :sportster_history:1980_xr-750_certificate_of_origin_by_dr_dick.jpg?direct&400|}}
 +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". Breaking out REAL info on old race bikes isn't easy. Take the term, original. It's a term that applies to street models, and not racers. Race bikes, by their service requirements, are useless as delivered and therefore obsolete on delivery. When you're talking XR750s, they were not raced in an IROC situation (eg- they got modded to beat the guys who lined up next to you). So
 +an original frame is kinda like the original homerun record or the original land speed record. The original record is zero. 
 +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 "factory original" mind set and mile post. from what i can piece together it appears that lots of stuff on the 72's was made to factory drawings by outside vendors. then the factory did the assm. I THINK: bike came in the std HD crate with handle bars removed.
 +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.
 + ((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/xr-sportster-motorcycle-talk-xr750-xr1000-xr1200/xr-750/165860-xr750-1977-frame?t=1782825)) \\
 +\\ \\ \\ \\ \\
 ====== Specs / Features ====== ====== Specs / Features ======
 ===== 1972 ===== ===== 1972 =====
-New redeigned 750cc engine with aluminum cylinders and heads. Also had new valves, pistons, rods, flywheel assm, "E" cams, carbs and tuned exhaust, 7/8" dia handlebars with an aluminum ball end clutch lever and a fiberglass seat/fender with with a foam cushion. +New redeigned 750cc engine with aluminum cylinders and heads. Also had new valves, pistons, rods, flywheel assm, "E" cams, carbs and tuned exhaust, 7/8" dia handlebars with an aluminum ball end clutch lever and a fiberglass seat/fender with a foam cushion. 
     * Engine Type: OHV V-Twin     * Engine Type: OHV V-Twin
     * Carburetion: Dual 36mm Mikuni carburetors and specially designed air filters     * Carburetion: Dual 36mm Mikuni carburetors and specially designed air filters

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