Two barrel carb, used two stroke oil injection for rotor tip lubrication, had max torque at only 3,500 rpm, used the same gearbox as the 750 triple two stroke “water bottle”. The one I rode had 120 km range before switching to reserve, then another 40 km on reserve. Those exhaust pipes got *hot*. They were also pretty loud. Incredibly smooth to ride, especially for a 1970’s engine.
@@mr.hitchens really? Hmm. I had a Kawasaki 750 triple and my brother in law a waterbottle. I had to ride his bike home in the wet and dark once. I had many layers of clothing on and the bike felt too big but it was easy enough to ride and seemed safe. I've been riding with one that was giving me a hurry up in the twisties too and I wasn't slow on that H2. Now if you said your H2 wanted to kill you... 😅
They make better bikes, that's the difference... Now if they took half of the 13b engine, you'd have a 650cc modern rotary putting the same 120HP as modern 600cc 4cyl piston bikes, so I'd think that would be really fun, but the old rotary engines like that one (air cooled or with small radiator is going to be insane low performance limitation just to keep them from melting), they probably aren't very good options. You could do modern one, but I'm not sure people would like the horrible fuel economy (I burned a quarter tank of fuel driving about 40 miles to work in my car.... That's more than normal but not by a crazy amount!), they also don't like starting when they are hot, or when they are cold, and even with fuel injection many people have issues with them flooding. They must also be driven like a madman every drive so they burn out the carbon on the cold side (which is probably fine if you consider it just like a 600cc sport bike, you're going to be doing wheelies or redlining them for fun pretty much every time you drive anyways) There are also really cool bikes now, like stock supercharged bikes, there's even a turboshaft driven bike I believe, there's bikes that run multi-fuel, there are people that put jet engines onto bikes (I thought about doing that, very easy and relatively low'ish cost, I mean its not cheap but its just for laughs and fun). There are bikes with exotic manufacturing techniques since even 20 years ago (like hydroformed magnesium frames to be light weight), now we also have carbon fiber, adjustable suspension on the fly, all sorts of cool stuff. Just like that bike was rare even then, we have cool rare stuff today.
I took one for a test ride in 1976 - a nice cruiser ride. I took a smart right turn at 45 mph and the 3-to-1 exhaust connector grounded so hard it moved my rear wheel a meter to the left! I tip-toed it back to the dealer. No sale.
That would be fun, how hard was it to engine swap that? I like the 13b in my RX-8 and wouldn't swap it, but they are cool engines and if its not very difficult to throw in small vehicles like a Fiat, well that could make a fun car too!
@@Endidixknsej you are correct and the rotary sounds come from 3 combustions per cycle, we are compering the rotary sound with standerd multi cylinder engine.....
Its going to be horrifically under powered, not like today's rotary engines. I would suggest doing a 650cc if you're a good machinist, use 1 rotor from the 13b engine and that would be perfect for a bike (nothing crazy at only 120 HP, so like a normal modern 600cc, but 1 rotor instead of 4 pistons).
@@cranky1812 Ok, so that's not BAD per se, but its not spectacular either. Its about 67% the power per engine size of my car, so its lacking quite a bit, but you're right, I guess horrifically under powered is an over-statement. It shouldn't be struggling to hit 55 mph like it was probably designed to cruise at on highways or even the 75 mph now. It would be totally fine for most people. Its just not amazing which is what I think of when talking about rotary engines (I think high revved, fire spitting engines with excellent power to weight ratio though poor fuel economy and horrible emissions, kind of like a 2 stroke in a lot of ways). I'm just in the mindset of even sub $2k cheap 20 year bikes with double the power and significantly lighter (sure its not "heavy" like a crazy custom V8 motorcycle, but its still got a dry weight of over a quarter ton!). But if you're not thinking sport bike and thinking more cruiser style or Harleys, ok then its probably very comparable in terms of top end performance. Then yeah like you said slap on some disk brakes, modern suspension (I would still recommend fuel injection as a high priority), and then some old guy wanting a novel engine on his cruiser is going to fall in love with it assuming its moderately reliable (which compared to a Harley it probably is 5 star).
@@jakegarrett8109 the weight issue in the original motorcycle is the frame and other components, rotary engines are simple and light. Modern chassis and suspension will reduce a lot of weight and at the same time with better geometry it will handle better. It can be good supermoto.
@@cranky1812 I think it will be much improved by those, but that old rotor style is lacking compared to the newer 13b design, hence I recommend updating it with one of the 13b rotors. I would opt for more power to weight for supermoto since I think you want high performance on those typically. Cruisers though you can get away with a potato bobbing up and down to putter down the road well enough, but if you're talking high performance engines then if it used 13b rotors it would be better. I personally want to buy a CNC or laser printer that can do Titanium/aluminum/SS and make my own miniature rotary engines (they sell for stupid amounts, about $700 for a 5cc Wankel). With the laser 3d printer I think I can get the rotor weight to such insane low mass it would perform much better and handle some insane rotational speed (I would probably even try to replace the rotors in my car with the new design). So I love rotary engines, but I would opt for building based on the newer generations than that older one (they've updated some aspect ratios for better performance and efficiency as one example of why the 13b makes more performance per size, that and they have a second intake that opens around 6.5k rpm kind of like Vtech, you definitely feel that it jumps in torque and power there!)
Nice sound. Reminds me of a 2 stroke. THIS IS A RARE BIKE!!! And working! I read a story in a biker magazine about these Rotary Suzukis , they sale of them was catastrophic. So they put them on a boat and dumped the rest of them in the Pacific ocean. So i dont no if its truth! I dont hope so. 😪
Oooh, a kick starter with no kick back! After having bikes that tried to bury my shin into my face (Ariel Red Hunter, XT500, Ducati SS) on a cold start, this must be a pain free bike?
Remember them well. Interesting bike with that engine and the instrument nacelle. Mazda had a rotary engined car out around the same time. Heavy bike, ran pretty warm.