Motorized Bicycle DIY: The hard way by bogyman57
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Squishing a Honda GXH50 into a Huffy 24" boy's Cranbrook Cruiser Bicycle.

WARNING: 
As of 2012, the Minnesota statutes have re-classified Motorized-Bicycles as MOPEDs and are
now required to be registered and plated.  BUT!!!  (and this is the part that makes me angry)
The DMV/DVS will NOT register "homemade" MOPEDs without a federally approved MSO (Manufacturer's Statement of Origin)
a.k.a. built in a federally recognized and registered factory.
Since *I* am the manufacturer, there is no way I can possibly do that.

I am currently pursuing registering it as a "Specially Constructed Vehicle" - lumped in with Choppers, Street-Rods, Reconstructions, and all other modified vehicles.  These people want RECEIPTS!
When I started this project a year ago, it was a BICYCLE and I didn't bother keeping any receipts (who could have known?)
Do yourself a favor:  SAVE ALL RECEIPTS!

Update: The comment section contains the instructions for "getting it registered & plated"
Many thanks to all the people who have helped me in this quest.



ANYWAY:

This bike project started out as a request from my wife:

She has a 4 mile hilly terrain commute to work (and she's very frugal)

We saw a youtube video of a motorized bicycle in action doing 30+ mph and getting 170 mpg.

AND THEN IT HAPPENED...

She said: "Can you build one of those?"

I said: "Hell yes!"

Then she said: "Well then, go ahead and build one for me"

SHE ACTUALLY SAID THAT !!! - I JUST ABOUT DIED FROM SHOCK!

(For the record, I think I have just about the best wife on the planet)

The 1st picture is a current (September, 2012) view of our new "MOPED".

1: It's got all the "legal" stuff taken care of... (it's been inspected, registered, plated, and insured)
2: The seat has been repositioned just as low to the ground as possible.
3: The headlight and all of the electronics have been upgraded - (see the schematic).
4: The turn signal/brake/horn switches have been upgraded.
5: The brake lights and turn signals have been upgraded.
6: The fuel filter has been upgraded.
7: The air filter is in the process of being upgraded.

It's DONE, FINISHED, COMPLETED, etc, etc, etc...

Whoa!  Stop!  Wait...

I've come to the realization that: THIS IS A NEVER ENDING PROJECT !!!!!

(run away!  run away!)

Phew!

The 2nd picture was a recent (March, 2012) view of how far it had come over the last year or so that I've been working on it.
- A very upgraded version from before the "long, cold, winter of 2011 - that never happened in Minnesota"

The 3rd (or is that the 11th?) picture is how it looked right out of the box around May, 2011  (*some assembly required)

The rest is, well:  A (very) detailed log of my work in progress...

Buy the ticket, take the ride...

(I hope you enjoy the trip)


 
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Step 1: Stripping/Chopping

As you can see in the photos, my original intent was to make a "V-Line Slash Cut" on the bottom of the frame parallel to the ground @ .375" above the chain wheel (plus and minus the .25" for the mount itself) .
It's hard to explain, but I think the pictures do a pretty good job of that. (see pic #3)
Then bend the forward frame to meet the "forward end" of the motor mount - to be welded later.

After the cuts were made and it was bent into shape, I decided that it didn't look quite sturdy enough.

So I drew up the plans for a 1/4" steel motor mount assembly in autocad, cut it out on the laser at work, and had a couple of the boys there weld it all together for me.

(again, I'm one lucky guy!)
bogyman57 (author) says: Apr 6, 2012. 4:53 PM
GOOD NEWS!

I HAVE A LICENSE PLATE!!!!

I went to the inspection site early this morning - armed with what I thought were the correct forms.

After waiting in line for 3 hours, I got the bike (oops, MOPED) inspected.

IT FAILED BECAUSE OF NO V.I.N.

At least THIS guy knew what I needed to do:
Go BACK to the DMV;
Fill out a "Statement of Facts" form;
Apply for a TITLE;
Supply 4-view PICTURES;
PAY the tax.

I went back to the DMV - who needed to call their "help desk" (and I use that term very loosely)

The "help desk" guy told her that MOPEDs don't get registered/plated.

I showed her the documentation that I printed out from the DMV website that contradicted what she was just told.

She told that to the guy at the "help desk" what I had - so he had to go talk to his supervisor.

When he came back he said something like:  "Golly gee - I guess you do!"

Then she asked what the procedure was for doing that...

He had to go talk to his supervisor again.

It turned out that she had to do EXACTLY WHAT THE INSPECTOR SAID TO DO.

I walked out of there with a plate in my hands.

I'll be receiving a letter from the DMV letting me know when I can schedule an appointment to go BACK TO THE INSPECTOR to have HIM weld my new "V.I.N. PLATE" onto my bike (oops, MOPED).

Wotta nightmare!

At least my wife doesn't need to worry about getting pulled over now.
(phew!)
sunderman says: Apr 18, 2013. 12:21 PM
I didnt want to do the math when I read this, so Im just going to ask. How much did this cost in total?
bogyman57 (author) says: Apr 18, 2013. 3:11 PM
It's cost me in the ball-park of $1000 (I really haven't kept track)
and I'm sure it would have cost more if I didn't work in a fabrication shop.
kprakasan says: Nov 15, 2012. 12:21 AM
wow truly looks like those vintage ones, i have a couple of questions , am sorry if these questions sound really retarded, is it a single speed bike , if its single speed why is the hind sprocket so big ,// if it was lil smaller wouldnt it make the bike faster , big sprockets , arent they for more torque, yea if the engine u use produce less torque then the big sprocket is to get the bike moving i guess, engine looks powerful though
bogyman57 (author) says: Nov 15, 2012. 3:38 PM
Thank you.
Yes, it's a single speed, and the big sprocket is for POWER (a.k.a. hill climbing ability)
The engine is at the maximum legal size for my region, as is its 30 MPH top speed.
kdf.inc1969 says: Sep 22, 2012. 7:45 PM
did you have to pay to get it registered? if so you just found out why it had to be registered in the first place,so somebody else could make money off of your great idea! lol. i sooo need to learn to weld. :)
Hmff says: Sep 4, 2012. 7:25 AM
The right way
Xthinker says: Aug 30, 2012. 8:50 AM
This looks amazing, I can't say anything else except that you've inspired me to want to build one. I bet your wife is happy!
TSC says: Apr 12, 2012. 5:32 PM
Nice man! I need to do this I have only done a weeder bike and one chain saw engine for a mini chopper that I built.
tjj07c says: Apr 12, 2012. 2:36 PM
did you do anything differently with the brakes or just used the original bike brakes? also, are bike tires made to go that fast?
tjj07c says: Apr 12, 2012. 2:34 PM
Love it, i tried doing this and the bike worked, but did not look like i wanted it to. i used a pressure washer motor and a lawnmower belt connected to a go cart pully and another smaller bike rim welded onto the actual rim. this one looks exactly like what i wanted mine to look like though.
Wesley666 says: Apr 3, 2012. 10:10 AM
Are you sure it has to be registered and insured? I know in my area, it only needs insurance and registration if its 50cc and OVER. Under that, it doesn't have to be, however, you aren't really supposed to ride it on the road, but I have a motorized bike (Its 150cc), a 33cc scooter and minibikes galore and I have rode past cops on all of them on the road and none have given a hoot. I would stop trying to get it registered, let that be the end of it and ride it as I wanted to, where I wanted to, because in the 1 in a million chance a cop actually pulls you over, you are either going to sweet talk your way out of it (I didn't know, its under 50cc so I don't need such and such paperwork) or you get a $50 fine and I could handle a $50 ticket once, but I have been riding stuff on roads for many years and it has never even happened.

Good looking bike though! You did a great job on it!
bogyman57 (author) says: Apr 4, 2012. 11:01 PM
Yes, I'm sure.

I went to the DMV today.

Apparently, I knew more on the subject than they did!

We came to the conclusion that I have to fill out an "AFFIDADIT OF RECONSTRUCTION/SPECIAL ASSEMBLY (page 2);
Bring THAT to the inspector (along with a full set of pictures);
Pass the inspection;
Bring HIS form back to the DMV.
THEN I can apply for MOPED plates.

At least now I have a plan!

But thank you for your support (grin)

Bogyman57
Wesley666 says: Apr 5, 2012. 9:23 PM
HAHA! Well good to see you doing everything by the book and actually being able to get it done!
bogyman57 (author) says: Apr 5, 2012. 10:51 PM
We'll see...

I have to get my butt out of bed at 7am to be at the inspection site by 8.

I haven't been up before NOON in TEN YEARS!!! (I work 2nd shift)

I'm not looking forward to the experience.

Is the "day-star" even out at that time of day???? (grin)
Wesley666 says: Apr 6, 2012. 3:37 PM
In the summer where I live it is, its usually up by 5am here and won't go away until around 11pm! Good luck with the inspection! :D
PHC_Productions says: Apr 6, 2012. 9:58 AM
Get a moped frame off ebay with a bill of sale <$20. Cut the front fork tube off the frame that has the serial number on it. Weld it to any spot on the bike. Use the bill of sale and register the moped as an assembled vehicle.
starplayer says: Apr 3, 2012. 6:34 AM
It's awesome man, but shouldn't the exhaust be longer? Your woman will inhale all the freaking fumes
bogyman57 (author) says: Apr 4, 2012. 11:26 PM
Shhhhhhh!!!! You'll spoil my plan!

But seriously, unless it's running in the garage, there's plenty of ventilation - especially when it's moving. The only time the engine is running and the bike (oops, MOPED) is not moving while outside is at a stop light - and stop lights are usually very windy places.

Bogyman57
SteveAlaska says: Apr 4, 2012. 6:37 PM
Im loving this project already and I've only read your first page. Hilarious.
bogyman57 (author) says: Apr 4, 2012. 10:43 PM
Aww Shucks...

Thanks! (I think...)
heathbar64 says: Apr 3, 2012. 3:42 PM
I'm not familiar with the rag joint you refer to in connection with the sprocket. please clarify.
bogyman57 (author) says: Apr 3, 2012. 5:38 PM
Thanks for asking!

A "rag joint" is a cheap method of attaching your sprocket to your bicycle wheel.

The "rags" are usually made from of old car tires and are sandwiched in between internal and external clamps (which attach to the sprocket) - the bicycle spokes themselves are inside of THAT sandwich.

In other words - it attaches your sprocket to the SPOKES, not the hub.

(I hope that made some sense)

Bogyman57
rimar2000 says: Apr 2, 2012. 2:04 PM
Wanderful project, the kid's dream.

But, is not it a little weak that bike frame for a 50 cc engine?
bogyman57 (author) says: Apr 2, 2012. 11:05 PM
Thanks!

But this is NOT for kids - it does 30 mph and climbs hills like nobody's business.

It's intended for street use (it's no dirt-bike!)

The frame has been reinforced, plus the addition of the motor mount and lower frame brace makes it quite a bit stronger than the original Huffy.
rimar2000 says: Apr 3, 2012. 6:05 AM
"The kid's dream" is a literal translation of a saying in Argentina: "el sueño del pibe". It does not mean the bike be for kids, but it is a dreamed and desired thing.

Glad to know that you reinforced the frame! This is a very good work, congratulations.
Aron313 says: Apr 2, 2012. 5:15 PM
Woww thats Crazy! Im going to have to take a closer look at this! :D
ride on toy dude says: Apr 2, 2012. 4:20 PM
Awesome man!! Could you try to convert an electric razor scooter to gas for your next ible? Those electric ones are so slow and they cant go far. Gas would be so much better.
seolfor says: Apr 2, 2012. 1:03 PM
Nice build. I'd like to hear how everything turns out with getting it registered. Wishing for the best for you.
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