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Hi gpzkat, we have been through this discussion before. We need to understand the primary cover used on the G/N15 series was an adaption of the primary cover used on the G12, which breathed through the crankshaft shaft, see enclosed link.AMC designed the upper hole under the oil deflector as breathing hole for the G12 engine. Sure, there is a very small vent at the rear of the chaincase also, it's probably inadequate for the G12 engine. Some venting happens at the sliding disc as well, but pressure pulses through this opening may attract road debris into the chaincase, so a shielded vent was probably considered a better option.[URL unfurl="true"]https://www.m5poo.co.uk/the-g12-amc-clutch-discombobulation/[/URL]Since there is no need for an engine vent here with the Atlas engine, you may plug the hole. Perhaps the AMC factory fitted a rubber plug when the bike was new, who knows after all these years? As a spare part, the cover was supplied in "assembled" form. The plug may not have been listed separately. I recall a rubber plug was finally listed separately for the P11A -- it should fit your cover as well. Maybe someone can dig out the number - 035xxx I believe.- Knut
Hi gpzkat, we have been through this discussion before. We need to understand the primary cover used on the G/N15 series was an adaption of the primary cover used on the G12, which breathed through the crankshaft shaft, see enclosed link.
AMC designed the upper hole under the oil deflector as breathing hole for the G12 engine. Sure, there is a very small vent at the rear of the chaincase also, it's probably inadequate for the G12 engine. Some venting happens at the sliding disc as well, but pressure pulses through this opening may attract road debris into the chaincase, so a shielded vent was probably considered a better option.
[URL unfurl="true"]https://www.m5poo.co.uk/the-g12-amc-clutch-discombobulation/[/URL]
Since there is no need for an engine vent here with the Atlas engine, you may plug the hole. Perhaps the AMC factory fitted a rubber plug when the bike was new, who knows after all these years? As a spare part, the cover was supplied in "assembled" form. The plug may not have been listed separately. I recall a rubber plug was finally listed separately for the P11A -- it should fit your cover as well. Maybe someone can dig out the number - 035xxx I believe.
- Knut
