China syndrome

I have a thread going else where with a few details of my build but I decided to do it properly and move it to the 'Minibike Builds' section. So here goes ...

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The project starts with the purchase of one slightly used BBR Style frame courtesy of miniriders member 'REIGN BIGFOOT' ...

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The frame is then sanded progressively with 400, 600, 800, and finally 1200 wet and dry paper ( used wet )

Then polished using some metal polish and a car buff to bring it to a shine ...



The problem at this stage was the diffuculty of polishing along the welds so it was then decided to remove the weld for a smooth finish.



This was the first rough grind with a quick polish to check the lines.

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Once the grinding sanding and polishing was finished, the assembly begins ...

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Some modification was required to fit the rear shock. The gap where the top of the shock fits is smaller with this frame so the spacers in the top of the shock were ground down to fit.



The shock only just fits in length ways and the bike initially appears to sit quite tall.
The frame also requires some modification to a crossbrace that sits above the resevoir on the shock. It just touches and will require clearancing.

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Another issue using this frame was fitting the 'trees'.
The tappered needle bearings from the trees dont fit this frame.
Instead I used the BMX style bearings the frame came with which isnt ideal but will suffice for the time being. At a later date I may machine the frame to accept the tappered needle bearings and cups.

Also the bearing cap didnt fit arounfd the head of the frame, so instead I used one off a 250 frame.

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Holes for the brake cylinder dont line up and I will have to make another bracket to suit.



I also need to source a foot brake assembly to suit this frame.

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Origonally I had planned to use this swingarm but when trying to fit, realised it wasnt going to fit with this shock. ( too long )



Also the swing arm that came with the new frame is lighter and has a stronger bearing arrangement.
So its not as pretty but is more practical really.

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The next problem I forsee is the exhaust. Because with the BBR style frame, I expect the exhaust will need to pass inside the frame.

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lookin good mate yeh get that brace fixed before your first ride

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red motox