Fork Oils

[rbabos]

Anybody know what's viscosity of fork oils for light , medium and heavy, used in Harleys? More specifically the best choice of Custom or Night Trains ?
Ron

[vindex1963]

http://www.v-twinforum.com/forums/en...viscosity.html

10w is factory
15w is heavy
20w is racing

[TheNowhereman]

Originally Posted by rbabos

Anybody know what's viscosity of fork oils for light , medium and heavy, used in Harleys? More specifically the best choice of Custom or Night Trains ?
Ron

Depends how you ride and the valving in your forks.
I welded up my holes in the fork tubes and re drilled them 2/3rds smaller diameter.
I now run a 15 weight Belray oil.
You can run a 30 weight oil with stock valving and some springs preload.
The big problem with HD forks is in rebound dampening, they don't have any...
If your a cruiser and don't put bikes through their paces, a good set of springs and store bought damper or cartridges will do the trick.
If you ride hard an fast like some do..hehehehe you need to try different oil weights and valving to get what you want.
When you dial it in, it's like a whole new bike.

[rbabos]

Thanks.
Ron

[Faast Ed]

I was looking for that info too.

Thanks!

[rbabos]

Ended up putting 15 in it with no apparent difference to function. As The Nowhereman man mentioned quite possibly damping probably blows and isn't really sensitive to slight viscosity changes. Amazing how dirty the old oil was at only 16500 kilometers.
Ron

[vindex1963]

Smells terrible also.