Hiya,
I've been running my MT2 G3.0 lately in snow (canada of course!) and the engine just started getting louder yesterday and it sound pretty much hollow/echo.
Is it just running leaner because of temperature or it's something else?
Answer Quickly!

Thanks.

Have you tuned for the cold weather? Cold weather causes a lean mixture if settings from a warmer temperature are used. This is because cold air has a higher oxygen density than warm air.

Maybe thats it, cause it sound metal alot.
Il try today if it's the problem.

Thanks!

No problem.

You should not lean too much to keep up the temp. Cover the head fins with aluminum foil or close the front windshield hole

Check the manifold screws. Mine came loose and the head pipe evetually came off. I found out after my MT2 got loud as hell. Bad gasket???

Its probably the exhaust coming loose... hurry and catch the screws!! check the gasket while your at it.