Old Britts, Mill Customer's 1972 Timing Side Crank Case

Mill Customer's 1972 Timing Side Crank Case

The current price for this service (part # 39-300902) is $100.00, as of 02/12/21.

To fix the oil pressure loss on 1972 and 1973 750cc Commandos (see the technical article for more details), besides milling out a pocket at the rear of the drive side crank, you need to move the breather housing to the timing case and drill two new breather holes in the case. For the later style cases, we mill a flat spot on the rear of the timing side case to accept the breather housing along with the two mounting holes and the breather hole. We also mill the two additional breather holes inside the case.

The case mounted on our mill after the milling operation.
Breather mounting

A close-up of where the breather housing will be mounted.
Case with housing nounted

The breather housing mounted to the crank case.

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