I completed my first motobike frame!

Nice build all the way. I'll be interested in hearing about the transmission/clutch when you're ready to go public with it. Good deal and good luck to you.
SB
 
Joaquin Suave said:
I'm happy to say that tomorrow is test ride day!

I'm confident of my clutch and transmission because they were run extensively on the test bench...but there is nothing like testing on pavement!

The only items to complete the bike is there new front wheel and disk brake, air cleaner, grips and paint....YEAH HOO!!!!!

46 pounds of pure love!
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That is really a light bike for a 50cc 4-stroke.....well executed! I really hope you do find it in you to produce products of innovation and quality in the future for our bikes.

dnut
 
Thanks for the compliments guys!

I really hope you do find it in you to produce products of innovation and quality in the future for our bikes.
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Me too! But there is a saying that I live by...
Making things is not the hard part...Making money at making things is.

thus, currently i plan on going after a very specific clientel that has much deeper pockets than your typical moto-bike user. After I get a good understanding of the market potential with "them"...I'll look at what I can offer to broader market.

Needless to say...This is not my first "Polka".
 
I now have my pannier rack/ fuel cell carrier 99% completed (i have to replace the blue masking tape for SS safety wire). I also had the pleasure of finally letting several long time old friends ride the bike for the first time today. Double thumbs-up from all involved!!!

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Really clean and really great looking. Those continental Traffic's are nice tires, but for strait on road, try some Michelin Pilot Sport's. I have had great luck with them in the past. But as for a hybrid those are pretty great. Do you have the specs for that Sturmey archer? I work at a bike shop and have yet to see an 8spd with left and right drive. I might just get me one :)

xct2
 
Letting folks ride your MB is great fun! When they first one takes off, I tell every one else to watch the smile when they come back. Just really cool to see that sorta happy.
 
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Did you use the rotor mounting bolts to attach your drive sprocket to the hub? If so, is that working well for you? If not, how did you mount your drive sprocket?

xct2
 
Thanks again for the compliments guys!

I now only have to silver solder the cable attachment eyes & H2O bottle bosses on to the bike then off to paint. I was going to cut the top-tube and down tube then weld in couplers, but now I'm thinking I'll just build them into the next bike...Or more likely design my own coupling system that would integrate into the motor mount.

Did you use the rotor mounting bolts to attach your drive sprocket to the hub? If so, is that working well for you?
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Yes, and so far so good. The holes are not very symmetrical, so i "picked-up" the small boss above the bearing. I now have the tool to remove the "guts" from the hub shell, so if I continue to use the SA hubs, I'll "qualify" a diameter then machine an adapter to mate to it.

Though i have yet to do it...I plan on blowing some safety wire holes in the heads of the mating bolts then safety wiring the bolt circle.
 
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It seems like budget has not been a concern on this build for you. I would like to build my own and was wondering about that hub. It looks pretty beefy on the outside, but i would like to run a morini or an equivalent to it. Im wondering why you did not. So, the question im asking is, If I were to get a hub similar to that, (or the exact one), would you recommend putting 9 or 10hp to it?
Other than that, your build looks VERY clean, and i really like the silver color you have with it. And also, do ou have any safety concerns for the flywheel being exposed?
xct2
 
I would like to build my own and was wondering about that hub. It looks pretty beefy on the outside, but i would like to run a morini or an equivalent to it. Im wondering why you did not. So, the question im asking is, If I were to get a hub similar to that, (or the exact one), would you recommend putting 9 or 10hp to it?
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My gut feeling is that a Morini would be pushing the limits WAAAAAY too far. Like all things in the world of design (especially industrial design) it is all about "scaling"! If a person pushes any component out of the "envelope"...they are bound for trouble. That being said, I really have got to question why you would even desire to have a multispeed hub (for pedaling) when you have a motor with such big cajonies.
My over-all concept is to have as light of "pedal-assisted" (this is the crux) motor scooter possible that is street legal in the "nanny" state of Kalifornia...OK! the top speed is higher than legal...But, but, that is because of the pedal assist officer ;o)

Other than that, your build looks VERY clean, and i really like the silver color you have with it.
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LOL! The frame is just bare steel. I have just been testing and modifying the frame before committing to the frame "braze-ons" and paint. I'll be replicating the color of this build but with the motor, fork tubes, and rack being charcoal grey. I think it will turn out REALLY tasty!

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I don't feel that the flywheel is really an issue.
 
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Honestly, I live in Louisiana and my cops arent going to care too much... But the reason for the hub is for speed and powerband. I am looking for a motor with a good bit of power, but even with that, the engine is good only at certain RPMs. I dont really care if this bike is street legal. honestly its more of a toy to sell. I would like to go to the next deathrace with it and compete. Now, you may say, but you live in LA, why would you travel all that way to race in a bike race. Then, my answer would be, for fun. I am a college student, and i am trying some new things with these bikes, not only for transportation, but also for safety and practical use. I already have another motorized bike, I am really just building this for fun and to race. Now, I do agree that all things considered, the hub does have a maximum amount that it can take... If you were to guess, what do you think it would be? Capable of wheelies in first gear? Lasting a grueling deathrace? Just want an opinion :)

Second, that yellow is sick looking.... Especially if you have matching rims and
spoke nipples. I cannot wait to see your finished build.

Thirdly, how does you bike pull, (power wise) with the four stroke? Is it comparable to the two stroke or is that subjective?

Finally, thank you for all of your input! Cant wait to finish seeing your build!!!

xct2
 
Here is a better picture...

The little eyes soldered on the down tube and chainstays are for safety wiring the various cables into place.

bare_frame2.jpg
 
Hey, thanks! That gives me some good ideas for simple fuel tanks. Why didn't I think of that before? (using a common plastic bike bottle and cheap bottle bracket. They can even be had as a set for $7.
A small hole at the top for a fuel line to enter, and using the top cap as a vent! Then I can easily fill the jug and when done using the equipment, dump the fuel in a can. dance1


Joaquin Suave said:
Fuel management by Campagnolo, LOL!

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