I have some Royal Purple 75W-140 that I was going to put in my transmission. On the label it says "not for use with wet clutches". I'm assuming I have a wet clutch and shouldn't use it.
This is for a 2000 Road King.

Just wanted to double check and make sure my understanding of my type of clutch is correct.

I saw on a thread search that 75-140 was an okay weight for the tranny and bought this stuff without reading the label.

 

As long as you are putting it in the transmission, you are fine. The clutch is in the primary and it has its own oil supply.

 

Harleys have separate oil supplies for the trans and primary, as Guntoter says, but many other brands of bike run the clutch and trans in the same oil. That warning is aimed at them, not you! Use a suitable primary oil, which is likely to be lighter weight than Royal Purple.

If you don't have a factory service manual for your bike I recommend you get one.

 

I used RP 85w140 in my 6-speed for a while but switched to Redline Shockproof Heavy because it was $4/qt. cheaper. There is no discernible difference between the two in operation, as far as I can tell in my bike, and I would recommend either. Both quieten the tranny and give very smooth shifting.

 

Dump it in and ride!

 

Thanks! This makes perfect sense. I have the service manual and 'fix my hog' video.

Even though this is a 2000 RK, I bought it as a garage queen a few months ago and it's just turning 5k miles. This is my first maintenance on a Big Twin. I did this stuff on my Sportster, but I was getting a little paranoid today about what goes in which hole.

 

Sounds like you made a great find! Congrats!

 

Take a deep breath, count to three and in you go! We're right with you.

 

a few years back some dealers used syn 3, harley's synthetic oil in 20/50 in all three holes. the royal purple will be fine. i use 20/50 synthetic in my motor, redline shockpruf heavy in the transmission and B&M trickshift automatic trans fluid in my primary. it's the best combination i've found. little to no clunk when shifting into first from neutral. i do tease the clutch plates when the motor is cold though allowing the plates to completely disengage. my friends can't believe that my harley doesn't clunk when going into gear.

 

I use Amsoil Severe-Gear 75W-90 in my transmission.