CPI vs Yamaha BWS wheel drive splines same?

[CPI Guy]

Hello I am wondering if anyone can confirm or deny if the CPI Tracker/JV50's "output shaft" is the same spline as the Yamaha BWS?

I know they have different size wheels... But I have a custom sprocket adapter made from a old CPI Rim. I am looking at replacing the motor (was CPI) and purchasing a very cheap BWS for the motor. I don't want to have to ruin a good BWS rear wheel to make a new sprocket.

This is on a trike build so I can mount the new motor/trans if I need to make brackets or what ever. I just need to be able to slide the sprocket onto the BWS power plant...

I know both are Mineralli style (kits and variatiors being equal) but the fact they have a long case or short for wheel size make me wonder what else may be different after the final drive gears.

If they are different splines.. is the final drive output shaft interchangeable? (take the CPI output and install in BWS box)

[CPI Guy]

I am surprised so many views but not one person knows if the 2005 BWS has same final output shaft as the CPI's ?

Lets try to word it this way,
If I wanted to upgrade the final drive gears in a 2005 CPI Oliver/JV50, do I need to order a special one or does the Yamaha BWS final drive gears fit in the CPI.

Another way to confirm is - I will count the splines on my CPI motor and see if anyone can confirm if BWS is the same.

[CPI Guy]

If any one can confirm the Yamaha BWS (2003-2005) model has a 18 spline rear output shaft for the rear wheel/hub?

This is what is on the CPI motor now.

I have been thinking about this some more..
I think even if the spline is the same - the brake shoes/drum will be different?
I don't think I will be using the brakes on the motor as it will drive a axle that can then use disk brakes to stop the axle/wheels.
I am trying to avoid making a new sprocket adapter from the perfectly good BWS rear wheel.

Split ball with me here... I am going to look at the 2005 BWS with less than 1000km on it from a older couple this weekend & would be nice to know the spline is the same without having to remove wheel to find out. Almost a shame to pull the motor but will be put to good use.