I'm using a mountain cub front end, the later version with outside springs. Bike bottoms out very easily. How can I fix this? Thanks.

new or heavier springs..

Thanks. Any idea where or what kind of springs I might use?

Seem to remember that there are damper sleeves between the bushes that should be renewed when the fork bushes are change as they also wear out and allow the oil to pass too quickly. Heavier oil may also help.