I just passed 26000 miles on my stock '99 bullet, and was losing power above 40 mph. I thought I may need to order a fireball kit but decided to clean the muffler first. I let a weak solution of NaOH "Zep" cleaning solution set in there over night and was surprised at what difference a decoked muffler makes in performance. I am using about 1ml of oil per mile and presumably, the oil is coking up the muffler. I suppose the rings could be coked up and letting more oil past the rings. I will wait a few more months before I order the Ace kit.
Autumn or early winter months is the best time to do the Ace kit.
It takes about 2-3 months to complete the Ace head at Mondello's. So, there is some time involved. During that time waiting for the head and barrel work to be done, the bottom end usually gets done, so that it's ready for the head and barrel when they are done.
First thing to do is get the head in to us, as soon as you are ready.
You have done very well to get that many miles out of a stock Bullet. They normally don't last that long.