Originally Posted by mike tkach (Post 4391659)

the cam bearings are not pressure lubed?

Originally Posted by mike tkach (Post 4391659)

the cam bearings are not pressure lubed?

Originally Posted by SB (Post 4391437)

Absolutely no experience here, just round table thinking out loud talk.

The lifters and cam lobes are getting oiled right ? Of course...so, this could be plenty of oil getting to the cam bearing.

Back to 2 strokes and roller bearing connecting rod and cranks, remember, they are using 60:1 - 70:1 fuel:oil ratios now. This means the roller bearings are seeing 60 to 70 parts fuel to 1 part oil, and surviving. Also remember, this is all in crankcase 'windage mist' - no splash and no direct oiling. Fuel is a cleaner, not to mention the stergents in pump fuel and the dtergents in the oil itself. Yes, some of us older blowhards are modifying our oil systems to get back to old school 50:1 ratios with our 2 strokes, but this is more for piston protection. These are spinning 8000-10,000 crank rpm vs camshafts which in a 4 stroke the cam spins 1/2 crank speed.

The only roller crank bearing failures in 2 trokes are usually because they are not large enough for the forces they see. In these applications, when larger bearings are used, problems go away. Anyone tell that I'm a Polaris guy ? Hah !

Ending my out loud thinking, I would call Dart. Your worry may become a non worry....Hopefully. LOL.

Originally Posted by Black Baja (Post 4391705)

No hole in the outer shell

Originally Posted by mike tkach (Post 4391911)

would there be any harm in drilling a very small hole in it?

Originally Posted by BenPerfected (Post 4391848)

We have been using the roller cam bearings for years. No issues but not likely worth but a few HP.

Originally Posted by mike tkach (Post 4391911)

would there be any harm in drilling a very small hole in it?