M8 idle rpm fluctuating

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Jul 18, 2022 | 06:00 AM

merv88

Thread Starter

Stage I

Joined: Jul 2022

Posts: 1

Likes: 0

From: Auckland

M8 idle rpm fluctuating

Recently got my bike tuned at the dealership with the power vision. After riding it for a bit the idle rpms fluctuating quite a bit and im not too sure if this is normal ?
Cold start up goes from roughly around 1100-1400 and once warmed up 800-1100.
setup is 2021 fatbob trask exhaust and s&s teardrop

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Jul 18, 2022 | 06:10 AM

Iceman24

Seasoned HDF Member

Joined: Sep 2009

Posts: 25,310

Likes: 2,446

From: Eastern NE

You. or dealer needs to adjust idle...300's quite a swing. My M8 wavers fm 940-1000 @ idle.

Jul 19, 2022 | 08:08 AM

izzyryder

Road Warrior

Joined: Mar 2012

Posts: 1,514

Likes: 88

From: USA

It's not normal. Fluctuating idle RPM could be caused by an exhaust leak.

Apr 18, 2026 | 02:15 PM

pgreer

Stellar HDF Member

Joined: Aug 2020

Posts: 3,184

Likes: 2,226

From: College Station, TX

If it's less than 10 seconds I'd wait until I could go through a tank and get fresh fuel in it and more mile and see how it goes. But remember the idle reset procedure and give that a try before spending money on that.

Paul