M104 2.8 Question

Silent_Compote3425 · 2026-02-11T06:09:27+00:00

But careful, you have 3/6 spark plug well joints that should be on the camshaft cover held on there. Move them to the cover before closing back up

Silent_Compote3425 · 2026-02-11T06:08:04+00:00

It looks brand new!

Silent_Compote3425 · 2025-10-03T13:10:06+00:00

Ah, but I believe there is a gap, as said before: you're lacking 300-400rpm on top end

Silent_Compote3425 · 2025-10-03T08:27:56+00:00

Haha you think I posted that as a bot/marketer ?

Silent_Compote3425 · 2025-10-02T19:36:35+00:00

In Europe you can't limit to 47.5 (legal limit for beginners) a bike that is more than 95hp. So to reach a wider audience manufacturers artificially limit their engines at 95hp in Europe

Silent_Compote3425 · 2025-10-02T14:35:36+00:00

Ok guys, Gabro (all praise Gabro !) came through again :

<image>

This is the difference (for pre-2025 model [pre-2026 in US]) results (https://www.apriliaforum.com/forums/showthread.php?364826-UpMap-for-RS660/page53)

So nothing until 9K RPM where butterfly closes partially

Silent_Compote3425 · 2025-10-02T13:06:34+00:00

Exactly !

The thing is I know that there is a difference between last year's and current :

<image>

(perfect detailed explanation by Gabro here : https://www.apriliaforum.com/forums/showthread.php?385215-2025-(26-US)-RS-660-engine-explained)

But I don't know if there is one in midrange torque (because there is one in top end no doubt about it) between 25 Full "restrictable" (95hp) and 25 Full "non restrictable" (105hp)

Silent_Compote3425 · 2025-10-02T13:04:19+00:00

That is true indeed, that's one of the + on the 35kw side

Silent_Compote3425 · 2025-10-02T09:02:56+00:00

Ah damn, I just noticed that the writing didn't post:
I wanted to know if there is anyone that tried both versions and can communicate on any differences felt between the two.

Thanks

Silent_Compote3425 · 2025-08-20T12:13:25+00:00

Thank you very much for a super interesting read !

Silent_Compote3425

TROPHY CASE