Modern Vespa

Hi

I recently purchased a Vespa GTV 250.

A new scooter is in my garage. It´s a 2008 vespa gtv 250.

I have update the corresponding maintenance: engine oil, oil filter, hub oil, coolant liquid, brake liquid check.

I have replaced voltage regulator and thermostat (they were in poor condition)

The scooter has a noise like decompression when you turn off the engine.

This noise is made when it has been on for a short time.

If the motorcycle is started for more than 5 minutes, it does not make the sound.

I attach a video with the sound I comment.

Is it normal?

What could be the reason for that noise?

Thank you

That sounds like the clutch bell and final drive gears spinning down.

It the rear tire spinning prior to shutdown?

What about when shutting it off from idling?

hi,

rear tire is not moving before turning it off.

Yes, it happens when it turns off at idle, even on the centre stand

the sound its plays between seconds 8 and 15 of the video

It definitely is something that is spinning around and is slowing down to a stop when you switch off the engine.
It is not the clutch bell nor the final gear because your rear wheel is not turning when you switch off the engine. They do not spin then.

The pulleys and the belt in the transmission are supposed to be fixed to the crank shaft and stop spinning when the engine stops without time lag.

Still it seems most probable to me it is something in the transmission.

If you see yourself capable of it I would remove the transmission cover and find out if something in there is causing the noise.

It is a 2008 GTV 250. It is quite old but it has the 250cc Quasar engine that has a good reputation.
How does it drive? Do you experience anything unusual then?

Do you have any information on service done on the scooter? And specifically on the transmission?

Hi

I will remove the transmission cover and do visual inspection and cleaning of what will cause the noise.


The scooter belonged to an elderly person who died. His grandson sold me the gtv (grandson didn´t have motorcycle driving license)

The Vespa had not been used for years and without maintenance checks made.

I have no history or previous repairs of the vehicle.

In motion de bike works fine. It has strength and does not make noises

I have done all the maintenance myself

I'm uneasy with that noise when I turn off the engine at idle

Can it be noise between bell and clutch when stopping??

I don't think it's a normal sound

thanks for all!!

The sound is very similar to the one in the next video but much louder!!!

https://www.youtube.com/shorts/CryR-DEicxs

in that video the rear wheel was turning for a couple of seconds after the engine was stopped.

Try feeling the starter when stopping the engine, if it is the starter motor spinning. The starter motor sprague clutch might engage as the engine kicks back at TDC, slowing down to a stop.