I gues I am the newbie here, I just received a 1971 Fastback that was restored for me in Atlanta.
I seem to have a main seal leak. I had a Norvil belt drive installed, and they cut a slot in the bottom of the primary chaincase cover under the Alternator. After running the bike on the freeway, oil seeps from this slot. Appears to be coming from the main seal area.
I suspected the engine was not venting properly. The problem only crops up when the engine has been running at elevated RPMs on a sustained basis, and does not show up on city stop and go riding. I installed a PVC valve on the breather hose. This valve was inserted at the place the stock bike shows an adapter that reduces the hose size to 3/8 where it connnects to the oil tank.
This appears to have reduced the amount of oil that leaks, but has not eliminated it. I still suspect a breathing problem rather than a main seal issue, but short of tearing into the engine to inspect the seal (it is a new seal) anyone have any ideas?
I seem to have a main seal leak. I had a Norvil belt drive installed, and they cut a slot in the bottom of the primary chaincase cover under the Alternator. After running the bike on the freeway, oil seeps from this slot. Appears to be coming from the main seal area.
I suspected the engine was not venting properly. The problem only crops up when the engine has been running at elevated RPMs on a sustained basis, and does not show up on city stop and go riding. I installed a PVC valve on the breather hose. This valve was inserted at the place the stock bike shows an adapter that reduces the hose size to 3/8 where it connnects to the oil tank.
This appears to have reduced the amount of oil that leaks, but has not eliminated it. I still suspect a breathing problem rather than a main seal issue, but short of tearing into the engine to inspect the seal (it is a new seal) anyone have any ideas?