I'm building small chopper for a design class.

Here is was an earlier mockup of the bike


I've been doing a little work on the frame the past few days to fit the motor. I cut a notch and bent down the down tube to get it out of the way of the motor.



Also modded the forks by adding suspension. Was going to lengthen the suspension tubes but realized after some work that I could have just cut off the drop outs from the chopper forks and swap tubes.


I plan to cut down the bridge piece later so the finder will fit propperly.

In case I can't find a suitable tank soon i've been filling in the holes on the sim tank.



The wheel i got off ebay the other day isn't going to work very easily without a LOT of major work (need machine tools). Unless the other wheel due in the next few days will work, I may have to weld a gear and disc brake onto the large hub of one of the chopper's front wheel and use it for the rear. If i do have to go this route i hope the straight lace wheels will handle the power from the 50cc motor.

LOL - looks like a great project! Keep us updated on your progress

This is cool! Nice work!

You gonna need one of these!:

Would love to have one of those pipes, Boondawg, for a later build they might be a bit big though. I'm running out of funds to finish it as it is and having to "McGyver/Monster Garage" it as much as I can. I may build another one later if I can find a cheap 80cc honda as it may not require cutting up the frame. Looks like have to take an incomplete just so I can regenerate some funds to live on.

How much for a finished one? You taking advance orders?

Not sure of price yet would need to get set up better for a small production. The engines are a bit pricey (for a college student) at $150-250 and it's been hard to find wheel that will work well. I may have to Ebay this one soon after it's graded to get the money back out of it. If I do more of these i need to get a better shop arangement for mounting the engine.

I've been trying to find a metal gas or oil tank i can snag the opening and cap off of but no luck so far. May stop by the motorcycle junkyard to see how much for a small tank that might work.

quote Originally posted by Sjuice: I've been trying to find a metal gas or oil tank i can snag the opening and cap off of but no luck so far. May stop by the motorcycle junkyard to see how much for a small tank that might work.

You're just looking for the filler neck & cap? Or a whole tank? If you don't find one locally - LMK, I can probably locate one here! BTW - if you have a cycle salvage yard, they should be willing to pretty much give you a "junk" tank if that's all you're looking for...

I was able to pick up a cap and hole for the tank yesterday. Was able to weld it into the new tank.







Just need to clean up the welds, add the outlet, check it for leaks and paint it.

Need to get the sprocket attached to the what will be the rear wheel so the engine can be located on the frame.

[This message has been edited by Sjuice (edited 05-12-2006).]

Glad you managed to find something!

Been working on other school projects finally got some work done on the bike past couple of days.
I finally got the bottom tube on the frame stretched. I'm waiting on another wheel i hope will work without needing too much modding so the motor can be propperly located in the frame. I clipped the motor mounts from the donor. They will need some work to make them usable but saves some trouble in making them from scratch. May weld in an "oil tank" style battery tray under the seat to help hide the upper motor mounts.

i welded a smaller diameter tube inside the joint for added strength







side by side of the modded and unmodded forks. the tubes will be trimed later, once the motor is installed and the ride hight is adjusted.

Still trying to get the tank finished. Had some trouble welding in the cap opening.

[This message has been edited by Sjuice (edited 05-21-2006).]

It looks great.

Keep in mind that if it goes faster than a Moped, over 30 MPH in most places, you will become a Motor Cycle and have to do allot more to make it street legal. That's if your after something you can use off private property or on trails.

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurasic Park)

The Ogre's Fiero Cave (It's also at the top of every forum page...)

I'm not too worried about it being completely "street legal" just need it to work well enought to get the grade. It sits a bit too low to be seen well in traffic but may drive it around on campus some. Not sure i want to go anywhere near highway speeds on this thing anyhow. It'd need motorcycle tires for speeds over 30mph as most mopeds tires are speed rated to 30-35mph. It will be as close to street legal as i can afford to make it; 4-cycle engine, full working set of lights, horn,... The bicycle's serial number is on the crank's bottom bracket so it's being left in place in case it can be used to create a vin if i try to legalize it, might also use it to locate the footpegs and rear brake pedal.

may have to go down to bike week with a few of these.

Finally got some real work done on this bike project. It took a while to find the right wheels that'll work for this bike. I now have a rolling chassis as i figured out a motor mount that looks like it'll work. Now just need to find a wiring diagram. I re-did the tank cap-hole but its still been fighting me with the welds.

It was gonna have a suspension fork but I messed up the plastic slides the shocks ride on and i can't find suitable replacements right now. I may try to build up a springer front end later but i ran outa money and time weeks ago. In order to pay for school i may have to sell this bike as soon as i've got the grade unless i can sell some artwork or open up some credit.

Not too far from done now just need some odd & ends and a bit of paint to get it completed.

[This message has been edited by Sjuice (edited 07-28-2006).]

Lookin' good... keep working on it! We need pics of you riding it

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Looking for Fiero posters?

Thanks, I hope to ride it this weekend.

Anybody know where I can find an online wiring diagram for this motor? The ones i've found online so far are either vage or poor scans. Seen some on Ebay but they won't get to me soon enough. The motor is a xr-50 clone made by Loncin. Other clones' diagrams, such as Lifan, may be useful. I've got a few wires i'm not sure where they go and not completely sure which terminal the CDI connects to.

May stop by a scooter store in the morning to see if they'll let me look over a bike's wires.

thanks,

Can't help you on the wiring.

If you are still having problems with the tank... clean the holes and surrounding area then use plumbing solder.

The big problem welding or even brazing a thin walled tank is thermal stress. You close one hole and can open another. Worse you've likely got different grades of steel involved in that one, which likely have slightly different expansion rates. Soldering doesn't need as much heat and doesn't cause as much stress.

[This message has been edited by theogre (edited 07-29-2006).]

I was thinking of using solder to finish it out and may also use some fuel proof epoxy for sealing and bondo for smooting. It just needs to get me through the week to get the grade. Wish i had known where to find filler holes a while back instead of having to try to hack tanks together. I'll see about buying or building a better tank after i get the thing turned in. I've seen some affordable moped/scooter tanks on ebay i'll have to look into getting but none really fit the look i'm shooting for.

Use the solder.

You say you just want a grade but face it... after that much work you want it to last a bit even just for off road fun.

I've never had good luck with the so called fuel resistant/proof epoxies. The solder isn't that much work.

I'm not to fond too of epoxy either but i haven't really mastered soldering steel. Besides I think i've got the holes weld plugged anyway. It didn't bubble when i blew tested it under water. I get paid next week so i'll just order a tank off ebay then. Got plenty of other stuff to worry about next week, cleaning out the old place, getting my laser cut fish skeletons ready for an art show, work, and other school stuff so riding will have to wait till a bit later anyway. (but i will have to sneak out for a ride or two )

[This message has been edited by Sjuice (edited 07-29-2006).]