You'll want the engine to be close to the rear wheel to minimize chain length and position the clutch farther from your legs.Chinese Mini Chopper Brake Parts > Mini Chopper Parts > Extreme Motor Sales, Inc When designing your frame, consider where your engine will fit. You can make your own mounting plate, but it's often cheaper to buy them, and you won't need cut the slots for the mounts. When welding long welds like these, ensure that you tack first and use lots of short welds so you don't warp the plate or frame. You can read more about these options in the parts section.Įngine mount was custom sized for the frame from a purchased engine mounting plate and 1/4" flat stock welded to form the correct size. Since you cut all the materials longer than needed, you'll have some options. Take your upper assembly and mock up how you'll like the stretch of the frame to look. Take the two pieces making the lower assembly, and lay on the concrete. Assembling the Upper and Lower Parts of the Frame You must fishmouth the joint between the "U" and backbone. From this line we were able to draw squared lines that outlined where the backbone was to be attached. Then we drew a 90* line through the two lines.
Using a carpenter's square we drew two parralell lines toward the backbone. To accomplish this we laid the assembly on the concrete and traced the "U" shape. The backbone tube was then welded to the "U" assembly. This "U" should be longer than necessary so you can cut the material to length when you mock it up. Since the pipe bender won't make a 180* bend, you must make two pieces and then weld them together in the "U" shape. The Raleigh Chopper is back Besides a limited run in 2004, fans of the iconic British-built kids’ bike can now get their hands on a new Chopper for the first time. Then we made two 90* pieces of material for the rear wheel assembly. We've heard that if you count the pumps you can make the same bend twice, so you may try that method.
It's not too time consuming to bend them equally in the pipe bender, though it's not an exact science. How We Built the Frameįirst, we cut and bent two sections of pipe to the same bend, roughly 100 to 110*. Our frame was made from 3/4" pipe, bent with a Harbor Freight hydraulic pipe bender. A frame that is square rather than rounded simply will not look as good. There are two main ways you can make your frame - with or without a bender. This will help you sketch your own ideas better. Surf our photos and others, and print a few out. Haven't already discovered it, there are many different styles of frame design, and subtle nuances to each. The first thing to do when considering the frame is what you want it to look like. Either you, or someone you love will be supported by it, and traveling fast - you do not want this thing to fall apart. Originally made by Jack Costello of Bonanza Minibikes back in the 60s. However, you must be sure of your welding ability. American Racer Mini Bikes are Designed and Engineered by Dave Miller DMC Concepts. The frame design is one of the most rewarding parts of building a mini chopper, so if you are able, we strongly suggest building your frame rather than buying one.
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Chop That Frame Up! How to Build a Mini Chopper Frame and Schematics
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