electric start "silver bullet train" engine

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Hassle definitely. But it would still be interesting, I'm seeing these large 100 cc duel cylinder airplane motors around:
http://m.ebay.com/itm/281926793720

Wonder what that would be like, I know it's nothing compared to a 5 cylinder radial aircraft motor in a bike but still would be cool.

Thinking of sticking it in a chopper style bicycle.
oh and i was thinking of this for a bit, using a modified centrifugal clutch (modified so that the weights were light enough so at the lowest setting it did not engage) or a belt system with some sort of manual clutch to engage the belt with friction may actually be viable if there truly is not enough torque from the engine to the tire to bent or break the crank shaft or key. that being said, i would look to make sure that it did actually have a key, otherwise you would just notice backfiring, then not starting, and then need a new crank. which would bend again.

also, i would look to see if the total displacement of the engine is what counts or if its per cylinder, if its per cylinder, whats stopping anyone from using two grubee engines geared high, front and back to get more power.. i found a brake lever that pulls two cables, adding a manic mechanic adapter to the front wheel and mounting it above the front fork is totally viable if you can weld. two dual brake levers, one for both clutches, the other for both brakes, and the throttle built into these brake levers (thumb throttle) one per motor, independent drive systems. probably cheaper too, not counting custom fabrication of a front fork with a motor mount. plus two separate carburetors, so dual fuel is totally viable, and two wheel drive. you could even use that pin release sprocket mount on the front and rear tires so you can completely disengage one and say the other is a backup with the po po none the wiser. with the aviation engine, if they wanna bust your balls you cant just pull off a cylinder and go "look its only 50cc". i mean, in terms of asthetic appeal, yea i guess its kinda cool, i cant argue that, but if i had to choose my scooter over a mint looking Harley that ran like crap, id choose my scooter every time. (actual yamaha zuma 125 scooter, not my gas bicycle scooter)
 
eh. if time takes its course and the engine becomes popular and as cheap as a grubee, or close to it, than yea ill give it a shot. but until then im not placing a bet on a unknown chinese company that was so interested in replying to my emails until i said that i needed to make sure parts were available first. not to mention, ive noticed that actual grubee engines have some serious advantages over the cheap copy i have. if the company isn't interested in responding, im sure their not interested in quality control either. ive replaced litterally over half of all parts on this thing. so if the quality is the same itll be screwed to hell in no time. unless i misread the forum the one kcvale had got around 200 miles before it sh*t the bed. 300 dollars per 200 miles seems like a monetary loss in my book. not even counting gas money and oil and setup time. (assuming the starter motor i found was incompatible with the engine. given the loose chinese standards thats a 50 50 chance. again another gamble.)
 
Did you just say Chinese standards? Oh no I think you read something wrong, there are no standards ;)

Also worth a mention is http://m.ebay.com/itm/3-4-Manual-Clutch-for-Go-kart-or-Mini-Bike-12-teeth-35-sprocket-/152113769854

Very professional looking and well built looking manual clutch, in case you're wondering on how that would be done out. Never had a thing for auto clutches.

That motor is 50cc per cylinder, however it would be worth mentioning is that it gets 2 shots per revolution, each half way through. Now our standard motor of the 66 variety only gets one shot per revolution, so a cycle (2 strokes of a piston) is 66cc worth of gas, the airplane motor will get 100ccs worth of gas for one cycle (also 2 strokes of a single piston)

It's defined as 100cc because the same single turnover (1 revolution) uses 100cc of gas/air while our normal bike motor uses just 66.

I'm sure you already knew this, but in case you didn't, now you do, as well as anyone else who is struggling to understand multiple cylinder motors (hopefully.)

My only fear is that in the efforts to reduce the price of the electric start motors to match the prices of a standard kit they (manufacturer and the cloners) will end up making it so completely s**tty that it breaks before leaving the post man's hands.

Of course the police can't demand you pull the cylinder apart and prove it's under 50 cc, that's like demanding I drain some gas from my truck to prove it's not leaded fuel by a test, or have my have me remove my brake calipers to ensure they aren't stolen by running the serial numbers. If I say my dual cylinder engine is 48cc total displacement then they have to accept it at face value and can't proceed further without an rs or pc to believe otherwise. If I'm not breaking any laws then they have no reason to pull me over. If I'm breaking the law then yeah pull me over, but still nothing they can do as far as tearing my bike open to see what kinda guts it has.

I'm all about being a sane driver, being respectful of the police and being polite and easy to work with when it comes to dealing with them. But I'm not against shoving a rookies head up his own ass with a superior to him being present when needed. Nor would I tolerate an ass hole trying to make a big deal out of my mode of transportation just because he feels like it. In this state the law is very much in favour of the motorized bicyclist and nothing makes it any different rights wise than a motorcycle or a tractor-trailer.

Any way off topic, but I could see you doing a friction drive on the front wheel, but it just seems unwieldy, it's a lot of weight to turn quickly, and 2 motors running at once sounds like a very fast way to get hurt if one (especially the front) fails.

Eh, it will be what it will become. My bets are it's going to be a very nice way to run around town, especially during those fun mid-intersection stalls (don't even try to claim you don't stall on occasion)
 
no i didnt mean a friction drive, i mean get wide front forks, add a manic mechanic adapter to the front wheel, mount the engine above the wheel, add a chain. also that makes the displacement 100cc. plus, technically 66cc engines are kinda illegal, anything under 50 is legal where i am. sorta.
 
no i didnt mean a friction drive, i mean get wide front forks, add a manic mechanic adapter to the front wheel, mount the engine above the wheel, add a chain. also that makes the displacement 100cc. plus, technically 66cc engines are kinda illegal, anything under 50 is legal where i am. sorta.
Lol you put a 50cc direct chain drive on your front wheel have fun I'll be here not dying.
 
a two wheel drive motorized bicycle seems like the ultimate offroad vehicle. throw it on a mtb frame, i guess use a centrifugal clutch on the front wheel and you'd reduce the problems. either way it'd haul ass.
 
a two wheel drive motorized bicycle seems like the ultimate offroad vehicle. throw it on a mtb frame, i guess use a centrifugal clutch on the front wheel and you'd reduce the problems. either way it'd haul ass.
Emphasis on the word "seems"

Perhaps an electric front hub and a motor driven rear wheel, that would be an ultimate off road bicyle.

Oh what yeah all those dirt bikes that run off road so graciously only use rear wheel drive I wonder why this is so...

OK an electric hub in the front wouldn't be so bad, however an entire engine on the front is worthy of death, especially a chain driven one. Once it locks up you are playing superman for about 3 seconds untill you come to your senses in a hospital bed finding out you went head first over your handlebars while offroading into a bunch of rocks or trees.

Any difference in speed between the 2 motors will have the bike being pulled apart or squeezed onto itself, you'll find the front wheel slipping during acceleration and the rear during braking. Both are a s**tty way to lose traction on an off road course, which in itself is not even a good idea to be going faster than a single engine can carry a person in the first place on.

Best bet is a single motor, a jackshaft, and some nice low gearing up to some high gears for the speed.
 
you do realize that the military utilized two wheel drive motorcycles specifically for overcoming obstacles in ww2 right? if the engine locks up with a centrifugal clutch the clutch disengages, problem automatically solved. if you use an electric planetary gear motor hub motor in the front thatll work too. especially if you have an engine like the one were discussing in the forum with an alternator that can charge the battery, and since its a geared motor hub theirs no drag. but two gas engines attached to a bicycle seems more fun to me. your talking 132cc total displacement with both tires gripping the ground. thats an orgasmic amount of acceleration, and fantastic traction. and if geared properly you have a higher top speed too. either that or if you gear it low itll haul ass up hills.
 
I did not know about the ww2 motorcycles, at least assuming you are talking about a front and rear wheel drive version, I know the BMW r75 was 2 wheel driven, however it was a shaft driven sidecar wheel, it was also over 700cc and I'll mention Harley Davidson made a version as well for the American military. I also know this was the product of ww2
KiH2xCw.jpg


It sucked ass and was never built again.

Also just because the engine can lock up, it doesn't mean other parts don't, such as the chain locking up or even slipping off and then locking up.

I'd rather install a loose rusty front fender than take a risk with a 66cc motor stuck to my front wheel.
 
and its still being manufactured, called the rokon...

and yamaha had a go at doing a hydraulic drive front wheel...

didnt really catch on though, did it? i cant see them being used by trials riders that can scale obstacles that would put mountain goats to shame... they stick to tiny little 125/250cc single cylinder suckers with virtually no bike underneath bar the wheels and handlebars.

and there is the drysdale attempt but he made it two wheels steer as well. apparently the thing is virtually unrideable!

this was a discussion on the jzeda engine originally. i cant help but feel that the email that KCvale copied and pasted was exactly my thoughts when i first saw the thing in HIS thread...without having had first hand experience.

its heavy. its complicated. its pointless. why wasnt it based on a fourstroke engine? they could have just as easily used the subaru-fuji/huasheng design fourstroke and made castings/toolings to suit that engine. and if they had hired a designer that had actually RIDDEN an MB... it would have fitted between a standard crankset.

instead they try to add all these features that are simply more parts to fail, more parts to replace, more parts to cause general confusion in the general public.

a perfect example of chinese DESIGN. they can COPY, but very few of them can actually DESIGN FROM SCRATCH... a quick glance shows that half the castings are just modified cases from the "venerable" HT style engine...
 
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