That's good news!
No bottom end work or upgrades for this?
The elephant in the room, I guess, is the crank balance question? Rev limiter or none, my bike's engine vibrations range from manageable up to 4000rpms, uncomfortable above 4000 rpm, to virtually unrideable at 5000rpm. What good would the performance upgrades be? If the alignment and balance of the UCE cranks can't be adjusted, does that add the cost of a new crank to the mix?
That"s a good question.
At this time, it appears to be relative to the individual machine in question
If the engine has a good build, there should be no problems using it "as is".
The vibration amount varies from one bike to the next, and there actually can be other contributors of vibrations than just crank trueness, and different riders have different levels of sensitivity to the vibrations.
So, it is quite an individual situation. Much of it would be based on how well the factory built a given engine.
The OEM parts and basic design should be capable to handle the upgrade.
I will say that the improvements are not restricted to high rpms, and there is a good amount of torque increase in moderate rpms, and a relatve "ease" of how the bike seems to feel when riding, without the feeling like it is struggling. This is seen in the other Fireballs, and when you ride at 60mph, it feels mote relaxed, as if you were riding at 40.
But if the crank actually is out of true badly enough to rattle your teeth, it should be addressed because that won't be too good for a stock bike either.
All I can really say about it is that we can offer these power upgrade parts, and each owner needs to assess his own bike and situation to determine suitability of application regarding the factory bottom end.