Hypoid gear oil is not designed for wet clutches. It's best suited for gearboxes that accommodate high shear situations like a helical 90 degree. In motorcycles it's usually used in a shaft drive rear hub. Stick with the gear oil specifies for motorcycles with a wet clutch. Every oil company makes ...

Either of those gear oils should be fine for your application. I would stay away from castor oil for street and trail use as it's a fairly dirty burning oil and tends to separate from the gasoline when sitting. Modern castors are way better than the stuff we used in the 60's though. If you're using...

I recently picked up a model 99 Road Toad from a buddy as a project, and I'm slightly unsure about the gearbox oil. I've been told a couple different things and have narrowed it down to belray gear saver 80w-90 (from what I've read on here) or 80w GL-4 oil. I'd love some recommendations, as well as ...