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Problem is CMB is no longer making the single exhaust MAC/CMB sleeve. I contacted two CMB distributors and they had none in stock. However the triport sleeve can be used in the single exhaust MAC/CMB crankcase, from what i was told. Like John said, many of the parts are interchangeable between the MAC and CMB Valvola. Richard DContact Stu Barr and get a 21 CMB Valvola P/S which is a direct replacement for the MAC. The rod is also identical and most other parts are too. A lot of success for those using the Valvola P/S's. Those that have the MAC parts will not let them go.
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