The Honda CB125 is a 122 cc (7.4 cu in) motorcycle made by Honda from 1971–1985 (1973–1985 in the US). It had an single cylinder overhead camshaft (OHC) engine with a 9500 rpm redline. The 'S' model was produced from 1971 to 1975 and was replaced in 1976 by the 'J' model (the US bikes retained the S designation). Honda CB125S. Honda CB125S0 - 1973; Honda CB125S1 - 1974; Honda CB125S2 - 1975; Honda CB125S - 1976; Honda CB125S - 1978; Honda CB125S - 1979; Honda CB125S - 1980; Honda CB125S - 1981; Honda CB125S - 1982; Honda CB125S - 1984; Honda CB125S - 1985; Honda CL125A Scrambler 125. Honda CL125A Scrambler 125 - 1967; Honda CL125A Scrambler 125 - 1968.
Complete coverage for your vehicle
Honda CB125S 1975. The bike has had two owners, one of which is myself. I have the V5 currently in my name. Bike has recently been MOT'd and is valid till 14th Feb 2019. Current millage is at 22389. The bike starts and runs well. It is in mostly original condition. I have replaced the seat cover, mi.
Written from hands-on experience gained from the complete strip-down and rebuild of a Honda Motorcycle CB125S, Clymer can help you understand, care for and repair your Honda Motorcycle CB125S. We do it ourselves to help you do-it-yourself, and whatever your mechanical ability, the practical step-by-step explanations, linked to over 900 photos, will help you get the job done right. Regular servicing and maintenance of your Honda Motorcycle CB125S can help maintain its resale value, save you money, and make it safer to drive.
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What's covered
Honda CB100 (1970-1972)
Honda CB125S (1973-1982) Honda CL100 (1970-1972) Honda CL100S (1971-1973) Honda CT125 (1977) Honda SL100 (1969-1973) Honda SL125 (1971-1973) Honda TL125 (1973-1975) Honda TL125S (1976) Honda TL250 (1975-1976) Honda XL100 (1974-1978) Honda XL125 (1974-1978) Honda XL175 (1973-1978) Honda XL250 (1972-1976) Honda XL350 (1974-1978) Table of contents
This Honda Vintage Motorcycle Manual is 368 pages.
QUICK REFERENCE DATA
CHAPTER ONE / GENERAL INFORMATION
Manual organization / Service hints / Torque specifications / Safety first / Special tips / Parts replacement / Expendable supplies / Serial numbers / Tune-up and troubleshooting tools
CHAPTER TWO / TROUBLESHOOTING
Operating requirements / Troubleshooting instruments / Emergency troubleshooting / Engine starting / Engine performance / Excessive vibration / Front suspension and steering / Brake problems
CHAPTER THREE / LUBRICATION, MAINTENANCE AND TUNE-UP
Routine checks / Service intervals / Tires and wheels / Crankcase breather hose / Battery / Periodic lubrication / Engine oil change / Oil filter screen cleaning / Front fork oil change / Periodic maintenance / Drive chain adjustment/ Front brake lever adjustment / Rear brake pedal adjustment / Clutch adjustment / Air filter service / Fuel shutoff valve and filter service / Engine tune-up / Camshaft chain tensioner adjustment / Valve clearance adjustment / Spark plugs / Contact breaker point adjustment / Static ignition timing adjustment / Dynamic ignition timing adjustment / Idle speed adjustment / Specifications
CHAPTER FOUR / 100 AND 125 CC ENGINES
Engine principles / Engine cooling / Servicing engine in frame / Engine removal/installation / Camshaft / Cylinder head / Cylinder head cover and camshaft / Camshaft chain / Valves and valve components / Cylinder / Piston, piston pin and piston rings / Oil pump / Crankcase and crankshaft / Camshaft chain and tensioner / Kickstarter / Break-in procedure / Specifications
CHAPTER FIVE / 175, 250 AND 350 CC ENGINES
Engine principles / Engine cooling / Servicing in frame / Engine removal/installation / Cylinder head cover and camshaft / Camshaft chain / Cylinder head / Valves and valve components / Cylinder / Piston, piston pin and piston rings / Oil pump / Crankcase and crankshaft / Camshaft chain and tensioner / Kickstarter / Break-in procedure / Specifications
CHAPTER SIX / CLUTCH AND TRANSMISSION
Clutch operation / Clutch / Clutch inspection / Clutch cable / External shift mechanism / Drive sprocket / Transmission and internal shift mechanism / 5-speed transmission and internal shift mechanism / Specifications
CHAPTER SEVEN / FUEL AND EXHAUST SYSTEMS
Air cleaner / Carburetor operation / Carburetor service / Carburetor adjustments / Throttle cable / Fuel tank / Fuel filter / Crankcase breather system / Exhaust system / Specifications
CHAPTER EIGHT / ELECTRICAL SYSTEM
Charging system / Rectifier / Voltage regulator/rectifier / Alternator / Breaker point ignition / Capacitor discharge ignition / Ignition coil / Ignition pulse generator / Ignition advance mechanism / Lighting system / Switches / Specifications
CHAPTER NINE / FRONT SUSPENSION AND STEERING
Front wheel / Front hub / Wheels / Tire changing / Tire repairs / Handlebar / Steering head / Front fork / Specifications
CHAPTER TEN / REAR SUSPENSION
Rear wheel / Rear hub and driven sprocket / Drive chain / Drive chain case / Swing arm / Specifications
CHAPTER ELEVEN / BRAKES
Drum brakes / Front brake cable / Front disc brake / Brake pad replacement / Brake caliper body / Specifications
INDEX
COLOR WIRING DIAGRAMS
Models covered:
1970 1971 1972 HONDA CB100 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 HONDA CB125S 1970 1971 1972 HONDA CL100 1971 1972 1973 CL100S 1977 HONDA CT125 1969 1970 1971 1972 1973 HONDA SL100 1971 1972 1973 HONDA SL125 1973 1974 1975 HONDA TL125 1976 TL125S 1975 1976 HONDA TL250 1974 1975 1976 1977 1978 HONDA XL100 1974 1975 1976 1977 1978 HONDA XL125 1973 1947 1975 1976 1977 1978 HONDA XL175 1972 1973 1974 1975 1976 HONDA XL250 1974 1975 1976 1977 1978 HONDA XL350
Clymer Manuals Honda CB100 Manual
Clymer Manuals Honda CB125S Manual Clymer Manuals Honda CL100 Manual Clymer Manuals Honda CL100S Manual Clymer Manuals Honda CT125 Manual Clymer Manuals Honda SL100 Manual Clymer Manuals Honda SL125 Manual Clymer Manuals Honda TL125 Manual Clymer Manuals Honda TL125S Manual Clymer Manuals Honda TL250 Manual Clymer Manuals Honda XL100 Manual Clymer Manuals Honda XL125 Manual Clymer Manuals Honda XL175 Manual Clymer Manuals Honda XL250 Manual Clymer Manuals Honda XL350 Manual Clymer Manuals Honda Motorcycle Manual Clymer Manuals Honda Manual Honda Motorcycle Manual Honda Manual Motorcycle Manual Clymer Motorcycle Manual
CB100 (1970-1972)
CB125S (1973-1982) CL100 (1970-1972) CL100S (1971-1973) CT125 (1977) SL100 (1969-1973) SL125 (1971-1973) TL125 (1973-1975) TL125S (1976) TL250 (1975-1976) XL100 (1974-1978) XL125 (1974-1978) XL175 (1973-1978) XL250 (1972-1976) XL350 (1974-1978) Print manualOnline manual
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Key features:
The Honda CB125S was a single cylinder, four-stroke Sport Bike motorcycle produced by Honda between 1970 and 1984. It could reach a top speed of 75 mph (120 km/h). Max torque was 7.52 ft/lbs (10.2 Nm) @ 6250 RPM. Claimed horsepower was 10.19 HP (7.6 KW) @ 7750 RPM. It replaced the inline twin cylinder Honda CB125. The CB125S came in two major versions the '71-75 'S' version and the '76 and later 'J' version although the bikes in the US retained the S designation. It features an overhead camshaft (OHC) engine with a 9500 rpm redline and offers 100 mpg. It could comfortably maintain speeds of 55 mph and had a top speed of around 65 mph. The engine could last tens of thousands of miles with only minimal attention; however, the oil had to be changed regularly (700 miles) to prevent premature wear of the camshaft bearings. The newer 'J' model sported a two piece head, 124cc displacement, and a larger carburetor, but it did not perform as well as the earlier models. These are interesting as the side cam drive type engine is a lot lighter then the center cam chain type, the bore and stroke also favors higher revs and more performance. The weakness if this machine, rather like the CB92 before it, was the four speed box compromised its performance, and the lack of a rev counter was also a problem.
These problems were addressed with the very much rarer Honda CB125K2.
Engine[edit]
The engine was a air cooled single cylinder, four-stroke. A 52.4mm bore x 57.8mm stroke result in a displacement of just 124.7 cubic centimeters. Fuel was supplied via a overhead cams (ohc).
Drive[edit]
The bike has a 5-speed transmission. Power was moderated via the wet, multiplate with coil springs.
Chassis[edit]
It came with a 80/100-18 front tire and a 90/90-18 rear tire. Stopping was achieved via single disc. two-piston calipers. in the front and a expanding brake (drum brake) in the rear. The front suspension was a telescopic fork (31mm diameter) while the rear was equipped with a dual rear shocks with 5-step spring preload adjustment. The CB125F was fitted with a 3.43 Gallon (13.00 Liters) fuel tank. The bike weighed just 282.19 pounds (128.0 Kg). The wheelbase was 50.98 inches (1295 mm) long.
![]() 1973[edit]
1973 Honda CB125
The CB125S0 was sold in 1973 and came in two available colors: Candy Topaz Orange or Candy Peacock Green. The gas tank stripe was white and black. The fenders were chrome. The front brake was a drum brake. The instrument was only a speedometer. The ignition used breaker points. The engine was a 122cc OHC single cylinder with a one-piece cylinder head. The transmission was a 5-speed. The serial number began CB125S-1021922.
1974[edit]The CB125S1 was sold in 1974 and came in just one color: Candy Topaz Orange. The gas tank had a black panel with white pinstripes. The diamond-shaped side cover wing emblem was red. The front brake was a mechanical actuated disc. The fenders were chrome. The instruments now had both a speedometer and a tachometer. The ignition used breaker points. The engine was a 122cc OHC single cylinder with a one-piece cylinder head. The transmission was a 5-speed. The serial number began CB125S-1021922. 1975[edit]
1975 Honda CB125
1975 Honda CB125S2 in Blue
1975 Honda CB125S2 in Blue
1975 Honda CB125S2 in Blue
1975 Honda CB125S in Blue
1975 Honda CB125S in Blue
1975 Honda CB125S in Blue
1975 Honda CB125S in Blue
The CB125S2 was sold in 1975 and came in just one color: Candy Riviera Blue. The 'CB125' side cover emblem was white and yellow. The chrome rear shock cover was deleted. The fenders were chrome. The front brake was a mechanical actuated disc. The instruments now had both a speedometer and a tachometer. The ignition used breaker points. The engine was a 122cc OHC single cylinder with a one-piece cylinder head. The transmission was a 5-speed. The serial number began CB125S-1021922.
1976[edit]
1976 Honda CB125
The CB125S'76 was sold in 1976 and came in just one color: Aquarius Blue. The 'HONDA' gas tank decal was red with a white outline. The '125S' side cover decal was white and red. The seat color was dark brown. The instruments had a speedometer but no tachometer. The fenders were chrome. The front brake was a mechanical actuated disc. The ignition used breaker points. The engine was a 124cc OHC single cylinder with a 2-piece cylinder head linked to a 6-speed transmission. The serial number began CB125S-1300009.
1978[edit]
1978 Honda CB125
The CB125S'78 was sold in 1978 and came in only one color: Fire Red. The gas tank stripe was orange, yellow, white, and black. The 'CB125S' side cover decal was yellow and white. The fenders were chrome. The front brake was a mechanical actuated disc. The instruments had just a speedometer. The ignition used breaker points. The engine was a 124cc OHC single cylinder with a 2-piece cylinder head linked to a 5-speed transmission. The serial number began CB125S-1500003.
1979[edit]
1979 Honda CB125
The CB125S'79 was sold in 1979 and came in one color: Light Ruby Red. The gas tank stripe was red and black. The 'CB125S' side cover decal was red and black. The front brake had a single leading shoe. The fenders were chrome. The instruments had just a speedometer. The ignition used breaker points. The engine was a 124cc OHC single cylinder with a 2-piece cylinder head linked to a 5-speed transmission. The serial number began CB125S-5000001.
1980[edit]
The CB125S'80 was sold in 1980 and came in one color: Light Ruby Red. The 'HONDA' decal and stripe were gold with a black outline. The 'CB125S' side cover decal was gold and red with a black outline. The fenders were also Red. The turn signal housings were black plastic. The instruments had just a speedometer. The ignition used breaker points. The engine was a 124cc OHC single cylinder with a 2-piece cylinder head linked to a 5-speed transmission. The serial number began JC04-5100001.
1981[edit]
1981 Honda CB125
The CB125S'81 was sold in 1981 and came in just one color: Black. The gas tank stripes were red and gold. The 'HONDA' and 'CB125S' decals were solid red. The instruments had just a speedometer. The turn signal housings were black plastic. The electrical system used a CD ignition. The engine was a 124cc OHC single cylinder with a 2-piece cylinder head linked to a 5-speed transmission. The serial number began JH2JC040*BK700005.
1982[edit]
1982 Honda CB125
The CB125S'82 was sold in 1982 and came in just one color: Candy Imperial Blue. The gas tank stripes were light blue and dark blue. The 'HONDA' and 'CB125S' decals were gold. The instruments had just a speedometer. The turn signal housings were black plastic. The electrical system used a CD ignition. The engine was a 124cc OHC single cylinder with a 2-piece cylinder head linked to a 5-speed transmission. The serial number began JH2JC040*CK800002.
1984[edit]
1984 Honda CB125
1984 Honda CB125
The CB125S'84 was sold in 1984 and came in just one color: Turuna Red. The fuel tank pinstripes were white and dark blue. The wing decal was gray and white. The headlight was round. The instruments had just a speedometer. The turn signal housings were black plastic. The electrical system was now a 12 volt.
1985[edit]
1985 Honda CB125
The CB125S'85 was sold in 1985 and came in one color: Turuna Red. The tank, side cover, and rear fender stripes were blue and white. The 'HONDA' and 'CB125S' decals were white. The headlight was rectangular. The instruments had just a speedometer. The turn signal housings were black plastic. The electrical system was now a 12 volt. The high tension electrical system used a CD ignition. The engine was a 124cc OHC single cylinder with a 2-piece cylinder head linked to a 5-speed transmission. The serial number began 9C2JC1308FR110001.
1970 Honda CB 125[edit]
The 1970 MY Honda CB 125 has, at its heart, an air-cooled, four-stroke, 124cc, twin cylinder powerplant that was paired to a five-speed manual transmission with a chain final drive, and can produce a claimed 15 horsepower and 9 Nm of torque.
Also, it has been fitted with laced wheels, a drum braking system in the front and in the rear, a center stand, a chromed exhaust system, an one-piece, dual seat, wide handlebars, a round headlight, a telescopic front fork, dual shock absorbers as a rear suspension and analogue instrumentation dials.
1971 Honda CB 125[edit]
The 1971 MY Honda CB 125 comes with laced wheels, a drum braking system in the front and in the rear, a center stand, a chromed exhaust system, an one-piece, dual seat, wide handlebars, a round headlight, a telescopic front fork, dual shock absorbers as a rear suspension and analogue instrumentation dials.
In the engine department it is powered by a four-stroke, air-cooled, 124cc, twin cylinder powerplant that was mated to a five-speed manual transmission with a chain final drive, that can reach a maximum power output of 15 horsepower and 9 Nm of torque.
1972 Honda CB 125[edit]
The 1972 MY Honda CB 125 boasts a maximum power output of 15 horsepower and 9 Nm of torque from its air-cooled, four-stroke, 124cc, twin cylinder engine that was mated to a five-speed manual transmission with a chain final drive.
1975 Honda Cb125s
Standard features include laced wheels, a drum braking system in the front and in the rear, a center stand, a chromed exhaust system, an one-piece, dual seat, wide handlebars, a round headlight, a telescopic front fork, dual shock absorbers as a rear suspension and analogue instrumentation dials.
1973 Honda CB 125[edit]
If you're on the market for an entry-level machine from the House of Tokyo, then the 1973 MY Honda CB 125 may be a serious option to take into consideration. It comes with laced wheels, a drum braking system in the front and in the rear, a center stand, a chromed exhaust system, an one-piece, dual seat, wide handlebars, a round headlight, a telescopic front fork, dual shock absorbers as a rear suspension and analogue instrumentation dials.
Also, it can produce a claimed 15 horsepower and 9 Nm of torque from its air-cooled, four-stroke, 124cc, twin cylinder powerplant that was mated to a five-speed manual transmission with a chain final drive.
1974 Honda CB 125[edit]
The Japanese engineers from Honda have designed the 1974 MY CB 125 as an entry-level machine, that could fit the needs for a wide category of riders. It has, at its heart, an air-cooled, four-stroke, 124cc, twin cylinder powerhouse, paired to a five-speed manual transmission with a chain final drive, and could produce a claimed 15 horsepower and 9 Nm of torque.
Also, it was fitted with a one-piece, two-up seat, a rear luggage rack, passenger grab rails, laced wheels, an analogue instrument cluster, a chromed dual exhaust system, a telescopic front fork coupled to dual shock absorbers in the rear, wide handlebars and a front disc brake paired to a rear drum brake.
1975 Honda CB 125[edit]
The 1975 MY Honda CB 125 has standard features such as a one-piece, two-up seat, a rear luggage rack, passenger grab rails, laced wheels, an analogue instrument cluster, a chromed dual exhaust system, a telescopic front fork coupled to dual shock absorbers in the rear, wide handlebars and a front disc brake paired to a rear drum brake.
In the engine department it is powered by an air-cooled, four-stroke, 124cc, twin cylinder powerplant that was mated to a five-speed manual transmission with a chain final drive, and can produce a claimed 15 horsepower and 9 Nm of torque.
1976 Honda CB 125[edit]
The 1976 MY Honda CB 125 boasts a maximum power output of 15 horsepower and 9 Nm of torque from its four-stroke, air-cooled, 124cc, twin cylinder powerplant that was mated to a five-speed manual transmission with a chain final drive.
In addition, it has fittings such as a one-piece, two-up seat, a rear luggage rack, passenger grab rails, laced wheels, an analogue instrument cluster, a chromed dual exhaust system, a telescopic front fork coupled to dual shock absorbers in the rear, wide handlebars and a front disc brake paired to a rear drum brake.
1977 Honda CB 125[edit]
If you're on the market for a lightweight and agile machine, suitable for the younger and less-experienced among riders. It comes with a one-piece, two-up seat, a rear luggage rack, passenger grab rails, laced wheels, an analogue instrument cluster, a chromed dual exhaust system, a telescopic front fork coupled to dual shock absorbers in the rear, wide handlebars and a front disc brake paired to a rear drum brake.
In addition, it can produce a claimed 15 horsepower and 9 Nm of torque from its air-cooled, four-stroke, 124cc, twin cylinder powerhouse, that was mated to a five-speed manual transmission with a chain final drive.
1978 Honda CB 125[edit]
The 1978 MY Honda CB 125 has, at its heart, a four-stroke, air-cooled, 124cc, twin cylinder powerplant that was mated to a five-speed manual transmission with a chain final drive, and can produce a claimed 15 horsepower and 9 Nm of torque.
This machine also comes with features such as a telescopic front fork coupled to dual shock absorbers in the rear, wide handlebars, an analogue instrument cluster, a round headlight, laced wheels, front and rear drum brakes, a one-piece dual seat and a side-stand.
1979 Honda CB 125[edit]
The 1979 MY Honda CB 125 has standard features such as a telescopic front fork coupled to dual shock absorbers in the rear, wide handlebars, an analogue instrument cluster, a round headlight, laced wheels, front and rear drum brakes, a one-piece dual seat and a side-stand.
In the engine department it is powered by an air-cooled, four-stroke, 124cc, twin cylinder powerhouse, paired to a five-speed manual transmission with a chain final drive, that can reach a maximum power output of 15 horsepower and 9 Nm of torque.
1980 Honda CB 125[edit]
The 1980 MY Honda CB 125 boasts a maximum power output of 15 horsepower and 9 Nm of torque from its air-cooled, four-stroke, 124cc, twin cylinder powerplant that was mated to a five-speed manual transmission with a chain final drive.
In addition, it has been fitted with a telescopic front fork coupled to dual shock absorbers in the rear, wide handlebars, an analogue instrument cluster, a round headlight, laced wheels, front and rear drum brakes, a one-piece dual seat and a side-stand.
1981 Honda CB 125[edit]
The House of Tokyo have launched yet another embodiment of their Honda CB 125, especially for those riders who want to experience the world of two-wheel riding for themselves. It comes with a telescopic front fork coupled to dual shock absorbers in the rear, wide handlebars, an analogue instrument cluster, a round headlight, laced wheels, front and rear drum brakes, a one-piece dual seat and a side-stand.
In the engine department it is powered by a four-stroke, air-cooled, 124cc, twin cylinder powerhouse mated to a five-speed manual transmission with a chain final drive, and can produce a claimed 15 horsepower and 9 Nm of torque.
1982 Honda CB 125[edit]
The 1982 MY Honda CB 125 has been created by the Japanese engineers for the younger and less-experienced among riders, but can just as well suit the needs of the more seasoned ones that prefer agility and fuel-efficiency over brute strength. It has, at its heart, a four-stroke, air-cooled, 124cc, twin cylinder powerhouse, mated to a five-speed manual transmission with a chain final drive, and can produce a claimed 15 horsepower and 9 Nm of torque.
Also, it comes equipped with a telescopic front fork coupled to dual shock absorbers in the rear, wide handlebars, an analogue instrument cluster, a round headlight, laced wheels, front and rear drum brakes, a one-piece dual seat and a side-stand.
1975 Honda Cb125s Owners ManualIn Media[edit]Honda Cb125s 1975 Owners Manual FreeReferences[edit]
Honda Cb125 For Sale
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