Classic Motorcycle Mechanics

More heavy metal!

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Last month I started to fit a PMC frame stiffening kit to the mighty Z1325 custom bike. This month there will be more fabricating and machining, to the frame of the original Z1000A2, but I’ll start with making a new set of engine mounting plates. The originals were not very thick mild steel plate and I thought that for this puppy I would upgrade to lightweight but stiffer 10mm aluminium alloy plate.

I started off by wiping engineer’s marking blue on the face of the piece of 10mm aluminium bar selected for the job. I initially marked the hole centres with a scriber. I then centre punched these and used the punch marks to scribe the radii of the triangle’s corners. I then joined up the radii marks with a scriber and steel rule. When scribing a job, always ensure that no lines go on any remaining surface i.e. outside the cut marks, particularly if it is to be polished as this job was. I then

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