Scrap Mini bike build

[Kaptain Krunch]

Well i havent built anything big since thanksgiving, so i decided its time to fire up the welder again. I've wanted to build a mini bike for a while, just never actually done it. My goals are to keep the cost under $50, I have everything i need besides sprockets and chain. The frame so far is made completely out of old school chairs, but im outa them so i'll have to dig into my scrap pile for the rest. The powerhouse for this thing will probably be a 5hp briggs flatty, no governor, port and polished, eyebrows shaved, .030 taken off the head custom exhaust, maybe a better carb.

 

[freakboy]

why not use the 440 you got? lol

 

[Kaptain Krunch]

HAHA right, then you can test it first.

 

[freakboy]

Alright sweet!

 

[newrider3]

LOL it's a new trend.

 

[freakboy]

What is? the mini bikes?

 

[Kaptain Krunch]

Scrap building im guessing. I've always done it this way, cuz i've always been cheap.

 

[whitepower]

looks sexy as hell make some kinda front suspension for the forks or something that stuff always cool

 

[Kaptain Krunch]

I dont think i have the materials to do front suspension, i might be able to rig up a springer front end, or something but it would be a challenge with the pipe i have left. If i can find a small 5 engine with a charging coil i could do lights, that would be sweet.

UPDATE

Put in a few reinforcements, added part of the seat mount (I'll be making my own seat with plywood, foam, and vinyl), welded in the mounting plate for the headset and Adapted one of the tires so that it can be keyed onto a live axle (just had bushings before).

Heres the back tire, what i did was remove the old bushings, and put in the keyed hub part from a larger 18" lawnmower tire, i tack it, got it as true as possible, then welded it up. Im pretty impressed with it, theres very little wobble in it.

Headset mount (it doesnt look square, but thats because the piece of stock isnt square, the bottom is square to the frame).

Seat mounts, pilot holes drilled.

Footpegs ill use, there left over from the motorcycle i used to make my shifter kart.

 

[EagleTalons]

The briggsy is being put to use!

 

[572bigblock]

I wonder if the school realized their chairs are missing yet?

 

[Kaptain Krunch]

Lol yea, all that trouble over the governor linkage was not for nothing...not sure if im gonna leave it governed tho lol, prolly will tho since its a cool bore.

The chairs were all broken when i got then i promise...

But no they probably havent noticed

 

[EagleTalons]

I ungoverned my briggs, but there was ALOT of other things wrong that led to its dieing.

 

[Kaptain Krunch]

what were the other things wrong? Mine seems pretty good, but i've never run a cool bore ungoverned.

 

[jr dragster T]

what were the other things wrong? Mine seems pretty good, but i've never run a cool bore ungoverned.

Like my dad always says about old motors "Go have fun buddy give r till she blows!"

 

[SpyGuy]

Hey, so can we get an update on this? How's the build going? Being a "scrap metal" bike builder myself, I'm interested in this thread ....

 

[r_chez_08]

I like your thinking! I want to build a mini bike with a briggs 5

 

[Kaptain Krunch]

I havent given up or anything, just been workin on my sled, picked up 3 more chairs last weekend so ill prolly do some more work tomorrow (maybe).

 

[Kaptain Krunch]

Finally did a little more, re-did the front end, and make the seat mounts (gotta cover that plywood in foam and vinyl). Been going slow on this thing, since its winter and my main priority has been getting my sled going good, which it is now.

 

[freakboy]

never knew something made outa chairs could look so good... altho it is shiny!very shiney!