Cyclepsycho's Yamaha Chopper

About that frame:

I get a LOT of e-mail regarding the frame on my Yamaha chopper.  People frequently ask who built it and the honest answer is; I don't know.
The frame came to me as an unfinished project that had changed hands a few times before I got a hold of it.  What I can tell you is that the front section of the frame is a stock XS650 one.  All the tabs and mounts have been shaved off except for the motor mounts and the brake lever hole.  The brace that normally goes from the top motor mount to the neck (where the stock ignition coils mount) has been cut out.  The steering neck is raked out to about 35 degrees and heavy gussets have been added around the steering neck to compensate for the removal of the brace mentioned above.  Everything behind the center post was custom fabricated.  


The top blue line is the distance from the rear axle to the steering head and is 52 inches
The top green line is the distance between the center post and the axle and is 30.5 inches
The lower green line is the distance from the center post to where the lower frame bends upward and is 6 inches
The red line is from where the lower frame bends upward to the axle and is 16 inches.  The angle of the bend is about 25 degrees.
The lower blue line is the distance between the hardtail sections (width) and is 7.5 inches (inside to inside)
The yellow line represents the length of the forks, which are stock XS650 and are 30 inches long.


The red line is the distance between the center post and the point where the frame bends and is 10 inches
The green line is the distance between the point where the frame bends and the axle and is 20 inches.
The blue line is the distance between the frame sections and is 7.5 inches

As I stated before, I did not build this frame and I do not know who did, but whoever did knew what they were doing.
Building motorcycle frames is a job that is best left to an experienced welder and fabricator.  Your life depends on it!
If you do plan to build or modify your own frame, at least have it checked out by a professional before you put it on the road.


Here's a tracing of the frame
click to enlarge




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