Does anyone run the 75w 140 RP, and what applications may it be appropriate to run the 75w 140?

No My Bad, I never stated the 75W-90 earlier.

regardless that's the info I was looking for! Thanks!

What about fluid in the BW transmissions? Is the RP synthetic tranny fluid to slippery for the tranny's?

TYPE F equivalent. I forget what brand I have in their. I think it is either Valvoline or Mobil. Probably synthetic something.

so your running a straight up type-f, no synthetic blends?

I just remembered, I am running Castrol Type F. The fluid change this spring I will be searching out what synthetic to run.

I would recommend this........
http://www.amsoil.com/storefront/art.aspx

I am sure that Amsoil is a great product, but after I blew up my modded Polaris XC800 during the first 100 miles after changing to Amsoil synthetic 2 stroke. I kinda have a bad taste left from them. And before adding Amsoil I basically ran a cocktail of any type of oil. Klotz, Yamalube, Polaris Blue Polaris synthetic and Ski-doo.

I ran Mobil 423 Hyd fluid in my BW tranny for years. No foaming. The fluid was so clean every year when I changed it that it looked like new fluid. I learned this back in the 80's from the guy that was doing the BW that were used behind the high HP HAWK motors. Another good mod for the BW trannys is to remove the thrust washers and machine case and replace the thrust washers with flat roller bearings the tranny will last for years.