Kawasaki H1 500 – Complete Specs & Story of The Mach III 1969–1976 Two-Stroke Triple
Starting with the Kawasaki H1 500 Mach III launched in September 1968, Kawasaki produced a range of unique, high-performance three-cylinder motorcycles, alongside the S1 250, S2 350, S3 400, and the flagship of the line H2 750 Mach IV. These stylish Kawasaki triples were targeted at younger riders with a need for speed and were designed for pure riding fun. The air-cooled, two-stroke Kawasaki triples were intended to be the two-wheel equivalents of Camaros, Mustangs, and Chargers of the era.
The 1970s were truly a special time, producing some of the most fantastic-sounding, raw-adrenaline-riding super bikes ever made. Machines you could fix with the tool kit supplied under the seat. You will never see days like those again. Poor gas mileage during a time of fuel shortages and high gas prices caused by the 1973–74 oil embargo made little difference to riders who craved the unique look and sound of the air-cooled Kawasaki 2-stroke triple, and they sold like hot cakes!
Their demise was ultimately brought on by tightening EPA regulations and noise legislation that targeted the noisy, gas-guzzling, oil-burning two stroke motorcycles. “Let the good times roll” couldn’t have been a more fitting slogan for Kawasaki in the 1970s, and they delivered on that statement.
Uncover everything you need to know about the iconic Kawasaki H1 500 two-stroke triple (1969–1976). From its full specifications to its rich history, this page reveals all the details of one of the most high-performance 500cc super bikes ever made.
The 1970s were truly a special time, producing some of the most fantastic-sounding, raw-adrenaline-riding super bikes ever made. Machines you could fix with the tool kit supplied under the seat. You will never see days like those again. Poor gas mileage during a time of fuel shortages and high gas prices caused by the 1973–74 oil embargo made little difference to riders who craved the unique look and sound of the air-cooled Kawasaki 2-stroke triple, and they sold like hot cakes!
Their demise was ultimately brought on by tightening EPA regulations and noise legislation that targeted the noisy, gas-guzzling, oil-burning two stroke motorcycles. “Let the good times roll” couldn’t have been a more fitting slogan for Kawasaki in the 1970s, and they delivered on that statement.
Uncover everything you need to know about the iconic Kawasaki H1 500 two-stroke triple (1969–1976). From its full specifications to its rich history, this page reveals all the details of one of the most high-performance 500cc super bikes ever made.
1969 Kawasaki H1 500 Mach III
Frame Number Range: KAF-00001 to KAF-06449
Engine Number Range: KAE 00001 to KAE 06449
Color: Midnight White with blue accents and silver fork ears
Fenders: Polished stainless steel
Gearbox: Five-speed with neutral at the bottom (gears all up: N 1 2 3 4 5)
Gear Change Shaft: Double-ended, allowing right or left side gear change—ideal for the European market and riders accustomed to British bikes
Handlebar Options: High or low handlebars available
Petcock: Automatic diaphragm (a Kawasaki first)
Frame Identification: No sticker on headstock until required for imports in October 1969
Ignition: US version has CDI box; European version has coils & points (CDI could cause interference with TV/radio; Capacitor Discharge Ignition by Mitsubishi had quality inconsistencies)
Oil System: "Injectolube" automatic oil injection
Drive: DID drive chain
Release Date & Price: Went on sale March 1969; MSRP $999
Fuel & Oil Consumption: Averaged 24 mpg; consumed half a quart of oil every 100 miles
Japanese Market Name: Sold branded as the 500SS in Japan
The CDI (Capacitor Discharge Ignition) was known to be problematic. Manufactured by Mitsubishi, inconsistent quality control during production often led to faulty units—proving that “just because it’s new doesn’t mean it works.”
Engine Number Range: KAE 00001 to KAE 06449
Color: Midnight White with blue accents and silver fork ears
Fenders: Polished stainless steel
Gearbox: Five-speed with neutral at the bottom (gears all up: N 1 2 3 4 5)
Gear Change Shaft: Double-ended, allowing right or left side gear change—ideal for the European market and riders accustomed to British bikes
Handlebar Options: High or low handlebars available
Petcock: Automatic diaphragm (a Kawasaki first)
Frame Identification: No sticker on headstock until required for imports in October 1969
Ignition: US version has CDI box; European version has coils & points (CDI could cause interference with TV/radio; Capacitor Discharge Ignition by Mitsubishi had quality inconsistencies)
Oil System: "Injectolube" automatic oil injection
Drive: DID drive chain
Release Date & Price: Went on sale March 1969; MSRP $999
Fuel & Oil Consumption: Averaged 24 mpg; consumed half a quart of oil every 100 miles
Japanese Market Name: Sold branded as the 500SS in Japan
The CDI (Capacitor Discharge Ignition) was known to be problematic. Manufactured by Mitsubishi, inconsistent quality control during production often led to faulty units—proving that “just because it’s new doesn’t mean it works.”
1970 Kawasaki H1 500cc Mach III
Frame Number Range: KAF-06450 to KAF-23625
Engine Number Range: KAE 06450 to KAE 21875
Color Options: Candy Red or Peacock Grey (Kawasaki initially listed the color as Metallic Grey)
Production Notes: A few minor changes were made during production, but the model was essentially unchanged from the original 1969 H1.
Updates & Changes:
Engine Number Range: KAE 06450 to KAE 21875
Color Options: Candy Red or Peacock Grey (Kawasaki initially listed the color as Metallic Grey)
Production Notes: A few minor changes were made during production, but the model was essentially unchanged from the original 1969 H1.
Updates & Changes:
- Black fork ears
- New distributor gasket
- Oil pump cover used a grommet
- Slightly larger CDI cover
- Seat trim updated to black
- Grab rail updated
1971 Kawasaki H1A 500 Mach III H1-A
Frame Number Range: KAF-23626 to KAF-48762
Engine Number Range: KAE 21876 to KAE 43901
Gas Tank: New shape and design without knee indentations
“Kawasaki” and “500” were applied decals and not painted on
Color: Candy Blue (only 1 color for 1971)
Updates & Changes:
Engine Number Range: KAE 21876 to KAE 43901
Gas Tank: New shape and design without knee indentations
“Kawasaki” and “500” were applied decals and not painted on
Color: Candy Blue (only 1 color for 1971)
Updates & Changes:
- Black fork ears and black chain guard
- engine painted silver
- Bridges removed from intake ports to improve gas flow
- New EK heavy-duty chain required the chain guard to be repositioned
- Modified CDI box
- Shocks and fork internals received improvements
All original 1971 Kawasaki H1 500 Triple Mach III 500cc two-stroke motorcycle
1972 Kawasaki H1B 500 Mach 3 H1-B
H1B Frame Number Range: KAF-47863 to KAF-65512
H1-B Engine Number Range: KAE 54101 to KAE 70023
Front Brake: Single front disc brake replaced the previous models drum brake
Color & Graphics: Pearl Candy Orange with iconic striped graphics designed by MOLLY. These graphics were painted on (not a decal)
Fenders: Painted orange
Engine & Internals: Engine cases polished (no longer painted silver); points and coils replaced the CDI
Seat & Lighting: Seat cover now has ribbed sections; tail light lens updated; wider turn signal indicators to meet new safety regulations
Controls: Black control cables instead of grey; Speedometer/tach, handlebar controls, and footrests updated; rear brake panel now black
Handling: Hydraulic steering damper added to improve handling (later recalled to prevent flexing at stiffest position and updated with a new bracket)
Chassis & Wheels: Tapered rear wheel spokes, thicker by 0.5 mm at the rim; aluminum forks with updated internals; welded fastening on gear lever to prevent loosening
Air & Performance: Redesigned airbox with new filter and different inlet tracts to the carbs; compression increased from 6.8:1 to 7:1
Exhaust: Heavier baffled exhausts to improve fuel economy and reduce noise
Weight: H1B & H2C weighted 25 pounds heavier than the H1A
Market Note: The H1B was overshadowed by the launch of the H2 750 but remained a top seller despite slightly diminished performance compared to the previous H1
H1-B Engine Number Range: KAE 54101 to KAE 70023
Front Brake: Single front disc brake replaced the previous models drum brake
Color & Graphics: Pearl Candy Orange with iconic striped graphics designed by MOLLY. These graphics were painted on (not a decal)
Fenders: Painted orange
Engine & Internals: Engine cases polished (no longer painted silver); points and coils replaced the CDI
Seat & Lighting: Seat cover now has ribbed sections; tail light lens updated; wider turn signal indicators to meet new safety regulations
Controls: Black control cables instead of grey; Speedometer/tach, handlebar controls, and footrests updated; rear brake panel now black
Handling: Hydraulic steering damper added to improve handling (later recalled to prevent flexing at stiffest position and updated with a new bracket)
Chassis & Wheels: Tapered rear wheel spokes, thicker by 0.5 mm at the rim; aluminum forks with updated internals; welded fastening on gear lever to prevent loosening
Air & Performance: Redesigned airbox with new filter and different inlet tracts to the carbs; compression increased from 6.8:1 to 7:1
Exhaust: Heavier baffled exhausts to improve fuel economy and reduce noise
Weight: H1B & H2C weighted 25 pounds heavier than the H1A
Market Note: The H1B was overshadowed by the launch of the H2 750 but remained a top seller despite slightly diminished performance compared to the previous H1
1972 H1C 500 Mach 3 H1-C
H1C Frame Number Range: KAF-48664 to KAF-52100
H1-C Engine Number Range: KAE-43902 to KAE-45902
Overview: The H1C combined features of both the H1A and H1B models. It was essentially a factory “use-up” model, designed to utilize existing stock of unused parts. Nothing new was introduced—just a way to exhaust leftover inventory. It’s noteworthy, though not notable. It was Kawasakis ‘Dr. Frankenstein’ moment in motorcycles, combining the dead stock parts of the H1A with the new H1B.
Components & Features:
H1-C Engine Number Range: KAE-43902 to KAE-45902
Overview: The H1C combined features of both the H1A and H1B models. It was essentially a factory “use-up” model, designed to utilize existing stock of unused parts. Nothing new was introduced—just a way to exhaust leftover inventory. It’s noteworthy, though not notable. It was Kawasakis ‘Dr. Frankenstein’ moment in motorcycles, combining the dead stock parts of the H1A with the new H1B.
Components & Features:
- Used remaining stock of H1A engines, CDI box, exhaust, front ends (drum brake, forks, chrome fenders)
- Painted in the new Candy Orange color
Production Purpose: Simply put, the H1C existed to use up old-stock parts taking up space in the factory. Production continued strictly until all surplus components were exhausted.
1973 H1D 500 Mach III H1-D
H1D Frame Number Range: H1F-00001 to H1F-17000
H1-D Engine Number Range: KAE 70024 to KAE 87000
Color Options: Candy Green, Candy Lime Green
Overview: Redesigned model featuring updated styling, including a longer seat, tank, and tail piece
Styling & Trim:
H1-D Engine Number Range: KAE 70024 to KAE 87000
Color Options: Candy Green, Candy Lime Green
Overview: Redesigned model featuring updated styling, including a longer seat, tank, and tail piece
Styling & Trim:
- Side covers feature “Mach III” in small letters under the new 500 emblems
- New center console instrument cluster
- Chrome fenders
- Reflectors added to fork ears and top of shocks
- Frame has updated engine mounts
- Larger 11.5" front disc brake
- Friction steering damper on headstock removed
- Forks adjusted 1 degree to help steady steering
- Swing arm lengthened by 0.5 inch
- CDI box same as on the H2, avoiding TV/radio interference
- Exhausts redesigned for quieter operation and improved fuel efficiency
- Sight glass added to oil tank
- Oil pump received updated gasket from engine number KAE-83625 to prevent loosening of locking plate bolts
- Carburetors updated for emissions, reducing output slightly to 59 hp (loss of -1 hp)
- Shim kit added to gear change from engine number 59017
Performance & Economy: - Fuel economy improved from 18–20 mpg to 23–25 mpg
- Quarter-mile time slightly slower (about half a second lost) due to emissions adjustments
Notes: The updated H1D was designed to meet emissions targets while maintaining the high-performance characteristics of the 500cc Mach III fuel economy had improved but at the cost of about half a second off its previous 1/4 mile time.
1974 H1E 500 Mach III H1-E
H1-E Frame Number Range: H1F-17001 to H1F-32399
H1E Engine Number Range: KAE 87001 to KAE 102399
Color Options: Candy Red, Candy Green
Frame & Engine:
H1E Engine Number Range: KAE 87001 to KAE 102399
Color Options: Candy Red, Candy Green
Frame & Engine:
- Frame lengthened by 1" to stretch the wheelbase to 56.5 inches
- Engine fitted with rubber mounts to reduce vibration at higher RPMs
- Check valves added to the bottom end of the engine
CDI & Electrical: - New, smaller CDI unit improved low-RPM response and extended spark plug life
- Ground wire added midway through production to reduce misfiring
Brakes & Gearbox: - Rear drum brake equipped with wear indicator
- Gearbox improvements implemented; shift fork widened from 21.0 mm to 24.5 mm to address gear engagement issues
Performance & Economy: - Fuel economy reported at an average of 23 mpg
- Quarter-mile times in mid 13s to 14 seconds, Kawasaki advertised 12.4 seconds
Notes: - Due to anti-pollution regulations in the US and Europe, Kawasaki knew two-stroke engines were becoming increasingly restricted. The EPA was hard at work drafting laws that would effectively limit two-stroke use, with manufacturers given emissions and noise targets in advance of legislation taking effect.
- All the major motorcycle magazines that tested H1E's reported on average 23mpg and 1/4 mile times in the mid 13's to 14 seconds. Despite Kawasaki's advertisement claims of 12.4 seconds.
All Original 1974 Kawasaki H1 500 Triple Mach III two-stroke
1975 H1F 500cc Mach III H1-F
Frame Number Range: H1F-32400 to H1F-46999
Engine Number Range: KAE-102400 to KAE-117099
Color Options: Candy Brown, Candy Sky Blue
Styling & Decals:
Engine Number Range: KAE-102400 to KAE-117099
Color Options: Candy Brown, Candy Sky Blue
Styling & Decals:
- No “Mach III” lettering on side panels; 500 emblems in white
- Re-designed gas tank decal with a curved point resembling a machete blade
- The tail section decals flowed to appear as a continuation of the tank decal
Air & Controls: - Restrictor added on top of the airbox
- Minor changes to footrests, controls, and instruments
Performance & Notes: - Kawasaki was forced to detune the H1F due to California’s strict 1975 emission regulations, the toughest yet implemented by the EPA. California was choking on the smog and the government stepped in to pass a nationwide emissions law.
- By 1975, Kawasaki’s best-selling model was the KZ400 twin, which offered low $999 MSRP and impressive 50 mpg, reflecting market trends away from two-stroke performance bikes
1975 Kawasaki H1 500 Triple Mach III all original condition Motorcycle
1976 KH500 500cc KH500-A8
KH500 Frame Number Range: H1F-47000 to end of production
KH-500 Engine Number Range: KAE 117100 to end of production
Model Year: All Model designations changed for 1976 (KZ, KH, KE); KH stands for Kawasaki Highway.
Colors: Copper or Burgundy
Transmission: New one-down, four-up gearshift pattern (1 N 2 3 4 5)
Electrical & Lighting: New three-way fuse system added a kill switch; updated 7" headlight
Air & Exhaust: Changes to airbox, carburetors, and exhaust pipes to meet emissions regulations
Wheels & Suspension: New front wheel using same disc as KZ900, braking system same as KZ900; fork leg has the option for a second disc brake; rubber-mounted engine; improved suspension; locking gas cap (mandatory requirement for US standards in 1976)
Styling & Features: Rounded, slightly lower sloping seat; three-stripe graphics on tank and tail; updated foot pegs, handlebar grips, large oval rear tail light, and single mirror
Performance: Main jets dropped from 92.5 to 75, reducing performance output to 52 hp
Service Notes: When the KH500 was launched in December 1975, Kawasaki issued a service bulletin to U.S. dealers regarding a potential problem with finding neutral in the revised gearbox. The bulletin stated:
"The 1976 KH500 has a neutral positioning bolt on the upper crankcase. On some early KH500s, the positioning bolt boss was machined too short."
Solution: Install an extra gasket and washer under the positioning bolt to correct neutral positioning.
Since the H2 was discontinued, the KH500 became the flagship of Kawasaki’s two-stroke triples in 1976. The KH500 evolved into a more laid-back, rider-friendly machine, prioritizing comfort over outright performance. By 1977, the 500cc model was discontinued, leaving only the KH250 and KH400 in production. Thanks to government anti pollution regulations in the US and Europe Kawasaki knew two-stroke street bikes were about to become a thing of the past in its largest selling markets (US and UK).
KH-500 Engine Number Range: KAE 117100 to end of production
Model Year: All Model designations changed for 1976 (KZ, KH, KE); KH stands for Kawasaki Highway.
Colors: Copper or Burgundy
Transmission: New one-down, four-up gearshift pattern (1 N 2 3 4 5)
Electrical & Lighting: New three-way fuse system added a kill switch; updated 7" headlight
Air & Exhaust: Changes to airbox, carburetors, and exhaust pipes to meet emissions regulations
Wheels & Suspension: New front wheel using same disc as KZ900, braking system same as KZ900; fork leg has the option for a second disc brake; rubber-mounted engine; improved suspension; locking gas cap (mandatory requirement for US standards in 1976)
Styling & Features: Rounded, slightly lower sloping seat; three-stripe graphics on tank and tail; updated foot pegs, handlebar grips, large oval rear tail light, and single mirror
Performance: Main jets dropped from 92.5 to 75, reducing performance output to 52 hp
Service Notes: When the KH500 was launched in December 1975, Kawasaki issued a service bulletin to U.S. dealers regarding a potential problem with finding neutral in the revised gearbox. The bulletin stated:
"The 1976 KH500 has a neutral positioning bolt on the upper crankcase. On some early KH500s, the positioning bolt boss was machined too short."
Solution: Install an extra gasket and washer under the positioning bolt to correct neutral positioning.
Since the H2 was discontinued, the KH500 became the flagship of Kawasaki’s two-stroke triples in 1976. The KH500 evolved into a more laid-back, rider-friendly machine, prioritizing comfort over outright performance. By 1977, the 500cc model was discontinued, leaving only the KH250 and KH400 in production. Thanks to government anti pollution regulations in the US and Europe Kawasaki knew two-stroke street bikes were about to become a thing of the past in its largest selling markets (US and UK).
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