1970 Kawasaki H1 500 Mach III from United States of America


Crazy fun, sometimes scary, and after bad early parts were replaced, a dependable bike


At around 4500 miles the crankshaft broke. They installed one with a new design that didn't break.

At almost 13000 the CDI unit broke a wire and was replaced.

At 13000 the left side exhaust pipe broke just before the muffler.

All were replaced under warranty, even though it had a 12000 mile warranty. Had a good dealer that took care of my problems.

Replaced a couple of clutch cables.

Almost forgot, the transmission would sometimes slip out of first gear into neutral for a half second, then slip in again to first just as the RPM hit 5000 or so, causing an unintended wheelie that would cause a flip if I didn't have good reflexes. Nearly got me a few times, straight up and hit the brake while turning off the throttle. All's good. Impressed a lot of people without trying.

General Comments:

Some people are very critical of its handling, and it wasn't perfect. I got used to its quirks and compensated for them. Don't crack the throttle hard when cornering, because the weight bias was 43% front and 57% rear. Slow down for turns, lean and accelerate using what power it could handle, which really was pretty good, then nail it when straight enough. Not great but doable. I was never left behind, but I never came up against a Norton 750. The torque was OK for a 500. If I hit a strong headwind I would have to downshift to 4th while my buddy's Superglide plowed thru it. Wanna drag race me? I did race his Sportster that had hot cams in it. Smoked him; not even close, even with a 10 mile an hour roll on to help him.

The seat had lots of room, but did cause butt burn the same as everyone else suffered. No one I knew went any distance without standing on the pegs and shifting. I rode it from Ohio to Fort Lauderdale Florida in 2 days in January. Wish I had a windshield. Fuel mileage was pushing 55 to 60 cruising about 60 mph. Don't know how some people got less than 30. I got mine out of 3rd gear into 5th and bingo!!! 55 to the gallon. Vibration in the handlebars was bad and left me tingling when run hard.

I lived about 7 miles from Shelby raceway near Sydney Ohio and was clocked at 12.8 at 101 mph in the quarter mile. It really was fast. My 73 500 was not. That was 14.5, which was a big let down. Totally de-tuned with different timing, smaller main jets, different pipes etc. Thrilling rocket the first one. Wish I still had it. Flawed but great.

Would you buy another motorcycle from this manufacturer? Yes

Review Date: 6th May, 2018

5th Nov 2019, 05:28

I bought a 1970 Mach 3 in 1971 for $600.00. It was my first motorcycle and the bike "expert" with me only said it's pretty fast and my take was it looked good in red.

I rode it around Texas for a year while in the Marines and my attitude was well this is what a motorcycle is like, popping wheelies in every gear when you really got on it, and if it handled bad I never noticed it. I did notice it would sometimes bog down while running at 80-85 MPH on interstate, and I was told that was due to the oil injection system not injecting enough oil, who knows. It was a blast to ride fast, but I was 21 with good reflexes and balance, and didn't think it was dangerous at all. Today looking back, it was a chainsaw on wheels and I'm lucky I survived it.

1969 Kawasaki H1 500 Mach III from United States of America


Requiem for THE one and only -- 69 H1 "Mach III" legendary classic Bad Boy "RPG bike"


Generally, this has been a very reliable vintage performance ride. Hard to believe the infamous Kawasaki 500 H1 (aka, "Mach III") 'triple with a ripple' is over 40 years old now.

Since I've owned it, I've had the following things go wrong:

- CDI unit and rectifier need to be replaced (no spark).

- Had to replace coil (suspect it was original).

- Carbs had to be taken off and rebuilt due to bad gas (there's no way to drain carb bowls).

- Leaky fuel petcock valve.

- You MUST have good battery to keep CDI unit (and spark) going.

- Control cables wear out and there are SEVEN of them in all.

That's it! So far I've been lucky with no middle cylinder head gasket, pistons and rings, etc. trouble.

General Comments:

What can you say about a living legend and classic that has got so many accolades from riders and reviewers alike over the years, but at the same time was subject of so many handling horror stories, dark myths, obituaries, criticisms, EPA regulations, 'Earth Day protests' and disapproving glances? :-)

No matter what you think of two strokes, triples or Kawasaki's first and early H1s and later H2s (750s), they certainly were memorable machines -- for riders, passengers and spectators alike. A time of the 'wild quest' when newer generation, more powerful and faster bikes (by today's standards) of the late 60s and early 70s set the stage for today's marvelously refined machines. This is a 'mini tribute' of sorts to the H1's soul... when 'men were men'...or 'just plain crazy'. :-)

Distinctive in their engine note (especially when revved in anger), you could hear an H1 howling well off in the distance on any given Friday or Saturday summer night back then. For better or worse... good or bad... suicidal or exhilarating... right or wrong....legal or illegal. They ushered in a new era of motorcycling and 'super bikes', street warriors and Detroit 'super car killers' (yes...before the term 'muscle car' became universal, they were called 'super cars' back then).

Some say (like me) that when the H1 came out in 69, it was the FIRST real super bike. But when Honda came out with the game changing 750 four "K0" 6 months later (in Japan), the H1 was quickly eclipsed. Still, the 69 H1 established itself as the undisputed "world's quickest accelerating production bike" with 4 second 0-60 MPH time factory stock (a title that lasted quite a few years). Whereas Honda's mighty Four was a more balanced performance bike that set many bars much higher (at the time), the H1 triples were meant to do one thing and do it really really well. Go fast... very fast... right off the line street light to street light; or on the town drag race road or at the drag strip. All for $995.00... 'nicely appointed' and purposely styled and set up right out of the box. Electric start? Who needs it? First or second kick anytime...

Unique things about the H1? The high output two stroke 3 cylinder air cooled engine of course... along with high voltage (with audible electronic buzz) CDI ignition and special non-gap plugs. Three cylinders... three carbs... 3-into-3 pipes and silky smooth 'all up' 5 speed tranny... with regular (but good) drum brakes front and rear. In fact, the H1 was really all about that engine. Otherwise, it was pretty standard fare. For the record, though, special new tires tubes had to be designed for the rear wheel that featured a separate locking rim screw/bolt to keep the rims from spinning inside the tire/tube. Such was the leap in power to the rear wheel at that time.

The result? At idle the H1 sounded like 3 separate/detached chain saws clattering, clanking and chattering disjointedly, unevenly and rather obnoxiously. Fire up the RPMs for a rapid launch and pop the clutch (carefully!) and those 3 seemingly unconnected single cylinder engines instantly all came together in unison with a muffled, 'deep throat' growl and flashy/torque smooth steep and peaky afterburner rush til they howled frenetically in the 5K to 6K RPM range (or beyond for those with bigger ideas and 'jewels') with each shift. Nothing sounded fiercer and more distinctive and ear shattering on the streets when wound and thrashed thoroughly about or when smartly downshifted -- except maybe an early Porsche 911 or a hi-po 327 mouse motor. Funny how Kawasaki issued a promotional decal/sticker for the Mach III of a Roman chariot pulled by three strong horses... quite appropriately it seems. :-) "Put something exciting between your legs?"


Those clean, chrome fork tubes (with no fork brace) stood out and gave the bike a slight upward rake. Living in Tokyo, however, I soon saw my share of mangled and grotesquely twisted H1 tubes/front ends from numerous crashes by local Japanese two wheeled "kamikazes" and restless US GIs stationed in Japan who eagerly snapped up the first Mach IIIs until the Honda 750 K0 came out late 69 (in Tokyo). You see, it seems that while the H1/Mach III could accelerate like a rocket in a cloudy blue smoke screen and cacophony of attention getting go fast noises (by virtue of it's 60HP mill and 400 pound something light weight), it couldn't take a fast or sharp corner worth crap. As a rider, you REALLY had to respect this bike and your entry speed and line. As a passenger, you probably were scared 'itless' regardless.

Enter a curve too fast after a brisk or scorching run and the rider simply couldn't negotiate the turn no matter how much the lean. The bike's frame was seriously under designed and under built for that big powerful engine... those steel frame tubes were too small in diameter and ground clearance was a bit marginal. From personal experience, an H1 would quickly get out of sorts under aggressive "G" cornering force or uneven and rough pavement or changing radius tight curves. I mean, you could feel the frame (and line) twitching underneath like jello or earthquake aftershock zone in the 'Valley'. "Flexible Flyer", "Widow Maker", "Kamikaze 500", "Triple with a Ripple", "Grenade Launcher" were just a few of it's more colorful and 'complimentary' nicknames over the years. I managed to survive my 69 H1 by learning to hang my body way out radically into the curve to offset the bike's CG and stress points. Or so I think.

Oh... did I mention the H1 Mach III (especially 69 to 71s) weren't good for open road touring? :-) Some actually did take them cross country coast to coast though back then... But at 25 to 28 MPG with a small 4 gallon-ish tank, they sure must of got to sample a lot of gas stations and body sores. But that wasn't the point. It was about running about the town racing anything/everything... or just racing against yourself for the onlookers to enjoy. Besides, you had to practice routinely good starts and runs. Or you would pop the ever lurking high wheelie... or slip the clutch all the way to the next block. Power bands? Yes... it reportedly had/has 3 separate ones. But I only ever experienced the first two...3K and 6K. Too scared to look for the third... (purportedly at 7 or 8 grand).

My particular H1 is a 69 'low case' model with VERY low serial # of 000685 w/matching original engine. Because of their milestone bike nature and mythical status (to some), prices for good clean original early H1s are usually well above

$6K. Especially the 'blue streak' paint job versions (mine is such)... I also have a 71 'blue strobe' H1... which actually may be slightly faster than the 69. But in terms of being the first model year and so socially crude, uncivilized and unacceptable (even by early 70s standards) the 69 is very endearing... and scary. :-) For you young contemporary modern riders out there, a similar type legend machine would be the first Ninja GPz900R ("Top Gun bike") in terms of ground breaking performance and milestone engine design. (oh...wasn't that from Kawasaki too?) :-)

Surprisingly, early H1s were OK for driving sedately around town or out on secondary country roads for a spell -- or even for some commuting. Usually that entailed lugging, restraining or shutting an H1 down -- which H1s were not really happy doing. They wanted to be revved and driven hard. On the power band (s)...on the pipe (s)...coming on strong like an aircraft carrier catapult. Consequently, H1s usually turned otherwise conservative, mild, timid and non-aggressive novice riders into speed freak, pavement shredding maniacs -- till wrapping one around a tree, doing a flip over wheelie, and scaring or swearing them off for good (if they were lucky).

41 years after seeing and hearing and experiencing my first memorable glimpse of an H1 being put through its paces, I'm STILL in awe of this machine. I respect it. I love it. I fear it. I yearn for it and the good old days of 'simpler' -- if not more dangerous and insane -- times and machines.

Today? They have obviously settled into a well deserved novelty and curiosity ride for the weekend collector/rider. But there are few more exciting, noteworthy (for better or worse), exhilarating, reliable and fun vintage bikes to ride and own.

If you love bikes -- especially old ones -- try to see and hear one in action and maybe you'll better understand this 'review' and tribute to the H1 legend and soul. It has achieved mythical status in the world of motorcycles for those who care about milestone vintage machines... and for those who 'were there' when these raw uncivilized beasts needed to be tamed and conquered.

Would you buy another motorcycle from this manufacturer? Yes

Review Date: 3rd March, 2010

16th Mar 2010, 19:22

I actually purchased a 1969 H1 new and rode it from New York to San Francisco in the summer of 69. My friend rode a Honda 350. The Kawasaki performed flawlessly until I got into the high altitude of the Rockies. Kind of put putted through the mountains as I had no money to have the carbs rejetted. Once out of the mountains, it again ran great. Sold it in San Francisco with 3600 miles on it, and flew back to New York on one of the first 747 flights. Amazing experience.