2016 R1 Engine surge

acemastr · 2 Oct 2019 at 13:56

Towards the end of the video you can see the engine RPM going up and down.

Between 3-6k rpm at a constant part throttle, in gear riding, or in neutral stopped, the engine surges.
I changed the spark plugs last month and have only ridden it a few times since, but the past 2 rides I've noticed this surge and can recreate every time.

-Replaced the gas
-Checked for kinks
-Checked for any air leaks
-Re-flashed the tune to make sure it isn't that
-Gave it an Italian tune up.

Above 6k rpm or with big throttle inputs it's perfect, pulls like it normally does, just that 3-6k surge on cruising throttle.

Any ideas?

Kreeeee · 2 Oct 2019 at 14:29

Is your exhaust servo functioning properly? That disables at 5.5k rpm if I remember correctly which might be why it clears up after that point.

acemastr · 2 Oct 2019 at 14:33

Kreeeee said:
Is your exhaust servo functioning properly? That disables at 5.5k rpm if I remember correctly which might be why it clears up after that point.

Removed that the first week I got it

Snaggle · 3 Oct 2019 at 15:12

Im assuming its the same as the Mt10 and has the exhaust valve on the cat ? have you removed the cat ? if so and not had it mapped .. get it mapped.. My MT10 was pretty rough after removing cat and valve

acemastr · 3 Oct 2019 at 19:27

It's been running mapped for 2 years, just suddenly has the surge

eddie101 · 4 Oct 2019 at 12:08

Checked/Cleaned the airflow sensor?

acemastr · 4 Oct 2019 at 13:21

eddie101 said:
Checked/Cleaned the airflow sensor?

It doesn't have one. I did check for an air leak but it's done by MAP.

acemastr · 15 Oct 2019 at 13:29

Figured this out.

I have an ActiveTune module from FTECU which has AFR targets it constantly adjusts to meet... it seems it is now faulty as I can switch it off in the map and the bike runs fine.

mingeroonie · 16 Oct 2019 at 12:25

acemastr said:
Figured this out.

I have an ActiveTune module from FTECU which has AFR targets it constantly adjusts to meet... it seems it is now faulty as I can switch it off in the map and the bike runs fine.

Thanks for taking the time to say what the problem was.
I have the same bike, so its always handy to know these things