Bmx Engine Kit 80cc




I decided upon myself to build this unique looking engine powered bmx. The total build time was approx 2 months. Here's what I did.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: The BMX

After some searching I came across this custom built frame on eBay for £235. I liked the look of it straight away and thought it would be perfect for what I wanted to do. The front suspension is very cool and looks like some sort of flexitor style suspension.

Step 2: Paint Job

Next was the paint job and as I'd spent so much on getting the bike I didn't want to fork out too much money for a professional spray so decided the best approach was to prime the frame with several coats of primer (red) and then spray paint over with several coats of the desired colour which ended up being black gloss for the forks and dark grey for the frame.

Step 3: Piecing Together

Once I'd sprayed the frame and forks I put the bike together with the mag wheels it came with and thought it looked rather cool! Shame I couldn't use the mags for the build so replaced them for 2 ordinary 36 spoke 20" rims. The rear rim needed to be able to fit 9 bolts through the spokes in order to fit the cog that comes with the kit also the chain tensioner was and still is quite difficult so I may even get rid of it as I have pretty perfect engine alignment.

Step 4: Engine Mounting

The engine mounting was rather difficult as I had very limited space in the frame and was very close to mounting it on the rear of the bike. The measurements were very precise. With a lot of manipulation to try and stop either pedal from hitting the sides of the engine and stopping me from ever being able to pedal if had to create my own way of bolting it to the frame which isn't exactly your standard frame for mounting these things. Steel plate with pre drilled hole and threaded rod and lock nuts were used.

Step 5: Mounting the Tank

This was an easy fit all I used was three blocks of wood to elevate the tank from the engine and because of the twin tubed frame this seemed to be the easiest option which was to simply strap the tank by using an old belt some screws and like I said three block of wood.

Step 6: Finishing

Throttle, clutch, muffler and electrics and it was finished.

Be the First to Share


    • Made with Math Contest

      Made with Math Contest
    • Cardboard Speed Challenge

      Cardboard Speed Challenge
    • Multi-Discipline Contest

      Multi-Discipline Contest

    7 Discussions


    1 year ago

    where to find that forks?


    3 years ago

    what is the budget for requirements ?


    3 years ago

    Wat type of engine should i use ? Can i use an engine of an old scooter


    4 years ago

    Hi there, the kit is from petrol scooter from eBay, it isn't read legal where I am I'm not sure where your from so I can't say if it's legal or not. I'm in the UK. Thanks for your interest in it I'm glad you like it :-)


    4 years ago

    where did the engine kit come from? It looks very good and would be extremely useful for my commute


    4 years ago on Introduction

    This looks great!

    Can you tell a bit more about the engine you used? Is that from a kit? A link to the source, and any any additional info about it would be super helpful for anyone wanting to do something similar :)


    4 years ago

    Is this road legal and do you need a license?