Sorry, Mine is a standard 2" https://www.amazon.com/dp/B01DDOQNQE?psc=1&ref=ppx_pop_dt_b_product_details
I think I took the sleeve that was bolted inside the 2" out and it fits good. Do you have a sleeve that's bolted in?
Richard
You might try changing the oil. They have a wet clutch and require API SG oil. Mine did way better when I changed mine. I used Castrol Motorcycle oil as it was the only one I could find out here with the SG. I'm 70 years old as well.