Cyber Lawnmower .com

I have a mini bike.. It goes 20 mph.. THATS SLOW! But if i put my mom's lawn-mower motor.. It will go 70 miles! Now i wont go 70 miles on public property.. Maybe at an empty dirt-base or something.. If it safe? Or will my mini-bike get to hot?
i ment.. *Is it safe.. smh typo's..!

You will not be able to go 70mph with the lawn mower engine. You need a gear box to get going that fast. Not to mention the even with the small frontal area of a mini bike you'll need over 15 hp to do 70 mph, and there aren't too many 15 hp lawn mowers.

But do it anyhow. Experience is the best teacher.

2009-08-11 09:29:45 by PIGGIE_LOVER<3

a falls mower Mini lawn mower briggs and stratton 5hp restore project. Sold before working on it, to many projects.

can you use a lawn mower engine for a mini bike arent the horizontal?

Moto Man is right. I've seen lawnmower engines in go-karts, but not a bike. A 2-stroke lawnmower engine could be tipped on its side because there's no sump with oil in it - but then the carburettor wouldn't work. A 4-stroke engine's crank is central, right along the axis of the motor, so in order to get it to drive the back wheel you'd either have to mount it offcenter or rig up some kind of gearbox or transfer case to get the drive to the rear wheel. You're better off with a chainsaw motor.

2009-08-30 22:40:39 by paperchain

i have an old electric bike, i took it apart and need to make a gear on the side instead of the bottom of the motor like a 90 degree gear.

Soichiro Honda did that a long time ago with bicycles and lawn mower engines after he dropped out of the eigth grade. That's the most successful drop out I ever heard of.

2008-06-24 19:36:42 by kyle

Right now I have a craftsman flathead engine making 5.5 hp.

I'd like to put it in a go cart or mini bike sometime, so more power would be more fun.

Any tips?

Get rid of those crappy mufflers and get a tuned exhaust from a 4-cycle small motorcycle engine (125-175 cc).

Put an extension on the air cleaner and grab air from a place away from the engine.Use low restriction air cleaner. Engine vicinity air is to hot, and hot air doesn't have as much oxygen in it as colder air. Ideally you could run your air thru a box with ice cubes in it so the air enters your engine as cold and dense as possible.

If you have access to a welder and grinder and drill press you can make an induction manifold for your carburetor. The longer the tubes between your carb and your intake valve the more time the gas has to completely vaporize and burn stronger. In an engine you want top heat production to make more power.

Use synthetic 50W oil and wrap a little insulation around the cooling fins. Since the lawnmower engine is made to run at walking speeds it has excess cooling fins to handle the heat of burning gas. Since your go cart moves, it doesn't need as much cooling. This is a trade off though. You want to keep your engine as hot as possible but not so hot you melt the valves or cylinder dome. So you got to experiment. Put a little insulation on engine..if's its ok with that, keep adding more until it smokes to much or power goes down (from oil not staying on cylinder walls)

Get a spark plug with multiple electrodes on the tip.

And most importantly and this is not the engine.. get a variable speed transmission (torque converter) and not a friction clutch. This transmission will make sure your engine is getting the optimum torque output no matter your speed.It's like having a hundred gear transmission.

Try to copy the design of a 125 cc four cycle motorcycle engine. These engines are smaller in cc's than a lawnmower engine but get about 15 hp out of them. Lawnmower engines are built for longevity and dirt and cheapness and heat. So they limit the horsepower on purpose so the engine lasts longer.

In all honesty you would be a lightyear ahead by just grabbing a used motorcycle engine and transmission and sprockets, chains and controls out of a wrecked bike rather than trying to use a lawnmower engine.

You could spend a 100 hr of labor and several hundred dollars trying to make your 5.5 hp engine put out 15 hp and Yamaha and Honda do this all day long. Don't reinvent the wheel and start with a proven engine and transmission. When I was a kid I tried those lawnmower engined mini-bikes and go-karts...they always disappoint. The clutches wear out quick and the motors arent designed for the high loads you put on them, so they break quick

2009-08-21 17:00:38 by Mako

this is just a project and was wondering if i can use a 2 stroke motor similar to whats in a moped or a lawn mower or edger

will it work

4 or 5 on you tube

2008-07-13 14:59:36 by go_pali