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my minichopper

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my minichopper

Unread postAuthor: schmanman » Fri Mar 09, 2007 5:31 pm

I built this for my best friend. not a single sent spent.

It, believe it or not, goes 60.

It has a speedometer.

the frame is from the 70's-80's

totally custom, uses a dirtbike front end, has a 4 hp kohler probably pushing 6 hp.

I'm giving it to him because he lives in a subdivision near me, and he can ride it to my house this summer, and hey, since I have a dirtbike, I dont really have a use for this sucker.

I got the engine (from 1970-somthing) from my grandpa, who had it in a cabinet in his garage, with the factory plastic wrap still on it.

put gas and oil in, and it ran first pull.

I have been assembling it, and fabricating in my spare time, every one and a while, in preparation for this spring, when we will take it to his house. I did the upholstery, too.

the clutch, which I accidentally broke the drum off, (centrifugal clutch), was professionally welded by one of my mom's friends, who runs a welding shop.

had other stuff, because behind my barn, i have a little motor vehicle junkyard of my own.

me and my friend know someone who runs a car customization shop, and he's gonna paint and bondo the tins (tank, fenders, etc.) for us.

anyway, here's the pics.

click the pictures to view full size


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this is how I got it in the first place:

last summer, I rode a bike my other friend had put an electric scooter motor on, and it was fun, so Immediately started looking for a frame i could build up.

well, about three days later, i turned this up.

it had almost everything, but a shorter pair of forks and different front tire, no engine, clutch, or handlebars.

so I got the bars form a salvage yard for $10, after buying the frame for $60.

I got the clutch for $25 new.

then, after a summer of riding, a shaft inside this Little gearbox that was on there snapped, and the gears seized up, and then rounded off.

I pushed it behind the barn, and put it under a tarp in late summer, after receiving my dirtbike.

so, a couple weeks ago, I pushed it back in, and flipped the engine around, flipped the air filter around to make it fit, replaced the spark plug, and re did the chain, and rear break, etc.

now I'm giving it away. :D
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Last edited by schmanman on Fri Mar 09, 2007 5:43 pm, edited 1 time in total.
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Unread postAuthor: pyromaniac » Fri Mar 09, 2007 5:42 pm

Freakin sweat! now all you goto do is mount a spud gun on teh handle bars. :D
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Unread postAuthor: schmanman » Fri Mar 09, 2007 5:45 pm

or the rear fender.

eat taters, fool!

lol. no, that would be ugly.

I'm gonna add an air horn off a peterbilt sometime this summer.
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Unread postAuthor: chaos » Fri Mar 09, 2007 6:13 pm

that thing is freaking kewl
but i doubt thats pushing 6hp, probably around 3 - 4 is more likely unless you have undergone mods.., our go kart engine was 6 1/2 stock and is now pushing probably 15 - 15 1/2hp but anyways that thing is kewl man that would be fun as to ride.

peace
chaos
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Unread postAuthor: schmanman » Fri Mar 09, 2007 6:16 pm

thanks! :D

well, my dirtbike is more fun than this thing, it is pushing 25 hp, and goes 70-75 mph, it is street legal, and is lots of fun off road!

on this minibike:
well, the exhaust port is enlarged (bored out with a mill), it has increased compression, and runs really well!
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Unread postAuthor: SpudBlaster15 » Fri Mar 09, 2007 7:09 pm

Nice bike! Good job with all of the fabrication.

I doubt boring out the exhaust port and increasing the compression will increase the HP output by 33%, but these mods will make a difference.

Horsepower is not very important anyway, what you want to look at is the torque output, and at what RPM range the engine makes peak torque. Increased bottom end torque will create axle-breaking acceleration, and increased high end torque will allow you to turn higher gear ratios at an equivalent rate, causing a gain in top speed. Horsepower is, basically, a statistic used to sell an engine, and it should be ignored if at all possible when comparing engines. Look at the torque curve statistics instead.
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Last edited by SpudBlaster15 on Fri Mar 09, 2007 7:14 pm, edited 1 time in total.
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Unread postAuthor: schmanman » Fri Mar 09, 2007 7:13 pm

thanks!

the engine is all cast iron, and has a bunch of torque.

(not as much as a dirtbike, though. duh!)


the thing can spin at 4000 rpm, and takes off relatively quick for a centrifugal clutch.

it is actually capable of a burnout. :D
although it ruins the tire, which is very soft, real quick. :D
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Unread postAuthor: WOW!! » Fri Mar 09, 2007 7:51 pm

I <3 you.



But not in a gay way.
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Unread postAuthor: jrrdw » Fri Mar 09, 2007 7:52 pm

Nice job! I was wondering what you where going to do with that engine, we talked about it allmost like a year ago. Theres not many of those 4hp's around anymore. Good job on rakeing the front end, does it ride balanced?
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Unread postAuthor: schmanman » Fri Mar 09, 2007 7:58 pm

sure does!
yeah, kohlers are really nice small engines, from what I've heard and experienced.

rides real nice, and is strong, chassis-wise. power wise too.

yep, the engine is getting used again.

was that really a year ago?..... yeah, it was! I started looking for a frame & engine last winter!.... wow.
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Unread postAuthor: Deko » Fri Mar 09, 2007 9:31 pm

sweet, that thing is awesome im impressed :D lol
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Unread postAuthor: schmanman » Fri Mar 09, 2007 9:33 pm

thanks!!!!!
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Unread postAuthor: chaos » Fri Mar 09, 2007 10:23 pm

thing can spin at 4000 rpm, and takes off relatively quick for a centrifugal clutch.


yer our honda can get to about 15hp 7000rpm on full load on the dyno :lol: i'll get pics on as soon as the engine is rebuilt its done probably 20000km without a rebuild lol yer so ill get some pics up when its done

peace
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Unread postAuthor: frankrede » Fri Mar 09, 2007 11:32 pm

Dam thats cool, makes me want to build a mini bike.
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Unread postAuthor: schmanman » Sat Mar 10, 2007 7:40 am

I'm Glad you guys like it.
it's pretty fun to mess around n, going up and down our dirt road and the surrounding ones (are "block" is 7 miles of dirt roads, surrounded by more branching off), and it actually does pretty good in my yard.

chaos, why dont you just make another thread? :D

sounds really cool.
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