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Need Help 2022 power loss, at high rpm. 31 hp only


berna

New Member
Joined
Feb 3, 2025
Messages
3
Location
Irvine CA
Bike
Rc390 2022
Hello!
I have a 2022 rc with only 2k miles.
Few months ago, out of the blue, I noticed a decent power loss at high RPM.

Brought the bike to two different dealers, they could not find anything wrong with it. No codes. Leak test normal. Got a fuel X lite, no improvement…

Bike is stock except for a chamber delete.

I decided to dyno the bike to see hp and air/fuel ratio. See pic. The air/fuel ratio was very lean up to 7k RPM, then looks ok after. Only 31 hp…I’m sure it had 7-8 more hp before.

Any idea? What should I check?
Has been like this for months now.
Bike is running well, just slower. You can see it has 31 hp at like 7-8 like it supposed to be, but then not growing at higher RPM.

IMG_2088.webp
 
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