1973 Honda CB750 Custom Build Episode 11

This week I notched the cylinder skirts so that the forged aluminum rods can clear them during rotation of the crankshaft. I used a Bridgeport milling machine and a radiused end mill to do the job. I followed up with a small grinding stone on a Dremel too to chamfer the notch and eliminate any rough edges that might harm the piston.

The depth of the notch ended up being 8 mm with a width of 28 mm. This allowed the forged aluminum connecting rods to clear the cylinder skirt by a little over 2 mm.

cb750 forged aluminum rod clearance

cb750 cylinder notch measurement

cb750 cylinders notched

cb750 cylinder notch chamfer

Here’s this week’s video showing the whole process.
Keep on hackin…

About Dino

Self taught electronics and hardware hacker.
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