Honda XR500R 1981-1982 Service Manual

Motorcyclespecs.co.za's own period road test frames this exact model year's arrival as a genuine industry surprise: "Honda's marketing philosophy differs from most motorcycle companies that try to fill an established need or want... even so, most people were surprised when Honda announced a completely new XR line for 1981. We're used to seeing completely new motocrossers every year or two, we're not used to seeing completely new play or enduro bikes so often. Three completely new XRs are offered; a 200, 250 and the subject of this test, a 500."

The genuine headline mechanical change, per that same contemporary review: "at the top of the new list is the frame with Pro-Link rear suspension. It's based on the system used on Honda's motocross bikes but none of the components interchange; frame material is mild steel, not chrome-moly like the track bikes; the swing arm is chrome-moly steel, not aluminum like the MXer." That review confirms Honda's engineers deliberately detuned the race-derived Pro-Link concept for a genuinely more durable, everyday enduro application rather than a straight transplant from the motocross line.

Power comes from a 498cc air-cooled single-cylinder four-stroke engine, OHC, with an 89.0mm x 80.0mm bore and stroke, fed through a 5-speed transmission with wet multi-plate clutch, delivering a claimed 36-37.5 hp at 6,500 rpm and roughly 30.6 lb-ft of torque at 5,500 rpm — CycleChaos' own spec sheet confirms a genuine top speed around 93 mph. Motorcyclespecs.co.za's own account details the genuine wheel-sizing changes that came alongside the new Pro-Link frame: "the 'Ride Red' folks also changed the front wheel dimensions too. The '81 XR came with a more conventional 21-inch front wheel, rather than a 23-inch front wheel. As for the rear wheel, Honda, for some strange and disturbing reason, fitted a 17-inch rear wheel, rather than go with the previous models 18-inch rear wheel" — a genuinely puzzling spec change even to period reviewers, worth knowing when sourcing correct tires and rims for a bike from this specific two-year window. That same review notes Honda left the engine itself essentially untouched for 1981 despite the comprehensive chassis overhaul, and that "the '82 XR 500 received cosmetic updates" as the only meaningful change for the second and final model year of this specific frame generation.

Suspension consisted of a 37mm Showa telescopic fork with 224mm of travel up front, paired with the new Pro-Link single-shock rear end, with braking handled by drum brakes at both wheels — genuinely simple, field-serviceable hardware in keeping with the XR line's reputation for durability, before Honda's subsequent 1983 update brought RFVC combustion chamber technology, dry-sump lubrication, and a front disc brake to the platform. Dry weight sits at a genuinely light 271 lbs, with a 20-litre (5.28-gallon) fuel tank supporting long-range enduro riding.

This factory service manual covers the procedures, torque specs, and diagrams needed to keep a 1981-1982 XR500R's Pro-Link-equipped engine and driveline running the way it was built to.