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Ended up getting a nice 5hp golf cart motor, I'll just use that.

Just discovered today that I can change the torque and speed of the motor using only the field coils. The stator coils run 48v constant, the field coils run on 12, 24 or 48 volts, 12 volts gets me lots of speed with low torque, 48 volts gets me low speed and really high torque, 24 volts is about...

OK managed to get an old generator for $15 today. It's not what I thought it was and I had to re-wire the field coils to make it work as a motor. They now run in parallel with the stator which is powered through a brush and commutator and the polarity can be reversed to change direction of...

Side note from another project, about how efficient is a toothed V-belt and pulleys? I'd assume a bit better than non toothed. And I'm assuming by toothed you mean the belt with the notches on the inside not one that goes on a toothed pulley like a timing belt. The pulleys are 3 inches around...

Also I got 2 old alternators today for free. Theyre the kind where the regulator isn't built in, with the field coils tied to a seperate connection. Add a 12v 10a PWM controller and I have a variable voltage and current generator that's perfect for driving the final drive motor.

Man, truck generators are really hard to find! I visited 5 wrecking yards today and no one had any. I'll try a couple more tomorrow. Otherwise I'm going to have to figure out what else has powerful DC powered motors that can be found cheap.

By overvolting I mean like running 36 volt battery pack to it with no current limiting. Motors are limited by current, and current by the load on the motor. So a stalled 12v generator at 24+ volts will fry very quickly but would run fine with a light load. That's what I mean by overvolting. In...

Just had an idea. What if I skipped the alternator and used a generator to generate the electricity as well? Then I could add a small car battery and be able to kill the engine when cruising flat trails between hills using battery power and start it again by hitting the generator with 12v from...

Remember its not your weight slowing you in the water its all the water you're pushing. A 100lb person could easily take over 200lbs of force to get up to speed in a reasonable time.

If you need lots of power and speed you might consider a couple old truck or tractor generators. They are used to start engines as well as to charge the batteries and can take quite a bit of abuse. But to pull full grown human through water at speed is not easy - my brother has a 50hp boat and...

I have a gokart I built last year, it has a 6.5hp lawn mower engine on a 3 speed riding mower transmission, and a belt slip clutch. I'm sick of replacing the belt weekly and having it jump every couple minutes. I'm thinking of running the engine to a 180 amp alternator and wiring that to 1 or...

Yes its centrifugal, and it has great compression. I moved it to another frame yesterday and looked in the exhaust port in the process and the cylinder doesn't have a single scratch from what I can see. Also for some reason I gained a bit of power on the new frame even though the motor...

I'm almost certain it's the 33cc, I went accross town to a hill I used to ride on my 49cc scooters without trouble, and I barely made it 20 feet. I'm looking now for a 49cc motor to swap in, and if it is already 49cc I have another frame in need of a motor.

Getting my camera back tomorrow, I'll get some pictures then.

I recently got a stand up scooter from a friend. I've changed the gearing and am adding disk brakes. One thing I'm not sure of is the size of the motor. There are ~33cc and ~49cc versions, I've had lots of both in the distant past (this is my first one in 4 years). The motor seems to pull hard...

I ended up doing a bike chain conversion, 17 tooth front 28 tooth back. Gets me the extra speed I was looking for yet I still have enough torque to get up hills. I also noticed that I have the 33cc engine, I now plan on upgrading to 49cc soon, and will likely change the gearing again when I do...

That's perfect, I can just weld it to the old 25 tooth sprocket and add a couple washers to the left side of the wheel to bring it all back into alignment.

I have to keep the reduction box, or the sprocket would spin backwards, and I'm not going to completely redesign the motor mount yet. Where can I find a 30t or 35t wheel sprocket? I could just weld it to my 25 tooth drive sprocket for 30/42 or 35/42. Right now I'm leaning towards using an 12...

That's going to be hard, my camera is at my second home 150 miles away. I should be able to get some pics on the internet. Engine is http://www.monsterscooterparts.com/49enwimapust.html with different muffler, transmission is http://www.monsterscooterparts.com/trfor3336434.html with 25 tooth...

Never mind, turns out I had the final drive typed in backwards. Still, any ideas on how to make this as fast as the others I've had?? Side note, rear sprocket is the smallest available, front is the largest available. I may be able to fit a 10 inch tire on, but that will only get me an extra...