u/Dave_7513

Hi everyone,

I have a 2015 Yamaha MT-125 with 36,000 km and I noticed a strange whining/whistling noise coming from the left side of the engine.

It only happens when the bike is fully warmed up. When the engine is cold, it sounds completely normal. If I warm the bike up, turn it off, and let it cool down for around an hour, the noise disappears again. The noise is most noticeable at idle.

The bike runs normally:

• No loss of power
• No warning lights
• No overheating
• Regular oil changes (done before the recommended intervals)

I attached 3 videos:

1. Two videos showing the whining/whistling noise when the engine is warm
2. One video of a cold start, so you can compare how it sounds before the noise appears

Has anyone had a similar issue on an MT-125?

Thanks!

https://reddit.com/link/1vhft6v/video/cdc0arl7ethh1/player

https://reddit.com/link/1vhft6v/video/1khw18j8ethh1/player

https://reddit.com/link/1vhft6v/video/rzuiml99ethh1/player

Hi everyone,

I have a 2015 Yamaha MT-125 with 36,000 km and I noticed a strange whining/whistling noise coming from the left side of the engine.

It only happens when the bike is fully warmed up. When the engine is cold, it sounds completely normal. If I warm the bike up, turn it off, and let it cool down for around an hour, the noise disappears again. The noise is most noticeable at idle.

The bike runs normally:

• No loss of power
• No warning lights
• No overheating
• Regular oil changes (done before the recommended intervals)

I attached 3 videos:

1. Two videos showing the whining/whistling noise when the engine is warm
2. One video of a cold start, so you can compare how it sounds before the noise appears

Has anyone had a similar issue on an MT-125?

Thanks!

https://reddit.com/link/1vhfobw/video/llmo8tx5dthh1/player

https://reddit.com/link/1vhfobw/video/y6g3v4e7dthh1/player

https://reddit.com/link/1vhfobw/video/w5xup7n8dthh1/player