Monster 937: is this rattling normal? with video

[sammy123]

Hi,
New Ducati Monster 937 owner here. Sound of the bike was fine until 700km, when i noticed a rattling noise starting at 2500rpm and above. It seems to come from the left front, but it hards to tell exactly. It is not present in idle and when the clutch is pulled.
Told this to the mechanic at the 1000km inspection and he said that this is normal desmo valve sound and that i must have been present from the very beginning, but i just did not notice it. Btw, i am pretty sure that i would have noticed it in case it was there, but it was not. also i have the feeling that this is an additional rattle besides the normal demso rattle.

Please check this Video. I intentionally drove slow to show the absence of the rattle below 2500rpm and presence above.
Best part is second 40-45 (above 2500 rpm: rattle) and second 46-50 (below 2500rpm: no rattle).

https://imgur.com/a/ducati-monster-937-rattle-wo6akV3#smqzc9x


thank you for help.

[stopintime]

Yes, there is an extra sound. To me, via internet, it sounds like a metal to metal sound... external, not engine... Maybe a loose bracket?

[sammy123]

i would be more than happy if it really is "only" a vibrating part that rattles. maybe not easy to find but once found easy to fix.
But i have no idea how to find the issue.

[stopintime]

Difficult...

I could be wrong, but that's almost easy to find out.

Rev engine while standing still?
Remove parts that CAN rattle?
Exhaust pipe valve shut closed/open?

[sammy123]

i have no motorcycle stand to jack up the bike. i have the impression that rattle noise only appears when a gear is enganged. rev engine in idle makes almost no vibrations and therefore does not trigger the rattling.

[stopintime]

I meant to rev it in neutral and/or with clutch pulled. No need for a stand. If that doesn't produce your sound, it's at least some info; more vibration is required for the sound to appear. To me, your sound sounds "light", not deep clunky like it would if it was internal. Could be wrong, but my guess is that it's not serious. Do you have a selfie stick for your phone/camera? Ride in a secure area and record several places around the bike to locate the sound?

[sammy123]

Hello!

Thank you for your answer. Unfortunately the rattle cannot be produced in neutral. I will have the chance to jack up the bike and "drive" next week. then i will try to locate the source of the rattling.
i really hope that you are right and it is just a loose part that vibrates.
At the moment  i think that there is also a chance thast this rattling might  be normal for the testastretta engine and the monster 937. i am no expert, but if it really is the desmo valves sound and therefore normal, it would be heard in neutral too, i guess. i dont know, maybe the valves only get loud when under load.

If it really is normal, i would be really dissapointed. this is my first Ducati and i bought this bike without thinking that it could sound "bad". And as i said before, i did not have this rattle at the test drive and the first 700km. if i would have had it, it would not have bought it.

[stopintime]

My idea was to record sound while riding.

Running the bike in gear, on a stand, is a BAD idea. The chain will move around violently, hit stuff and worst case jump a sprocket.

The fact that the sound is there only in gear tells me/suggests that the rattling frequence depends on engine load. Is the rattle gone when you let go of the throttle in 'high' revs?

This sound can be diagnosed by 'anyone' who is willing to listen. It doesn't have to be Ducati mechanics.

[sammy123]

I made an appointment with the ducati dealer i got the bike from. i think he will jack it up. maybe he has some other kind of "station" to ride the bike in stand.
I think that it is almost impossible to check the origin of the rattle during real driving. my impression is that is from left side on the front. but this impression could be wrong.


The fact that the sound is there only in gear tells me/suggests that the rattling frequence depends on engine load. Is the rattle gone when you let go of the throttle in 'high' revs?

When i stop throttling at a high rev level, it seems that the rattle remains until revs drop below 2500rpm. The rpm drops very fast when stopping throttling, but i believe  can hear the rattle remaining for this short time the 2500 rpm level is fallen below.

[sammy123]

here is another video. with higher revs. gopro was on helmet (not chest as before), so more wind.

https://we.tl/t-5kyetZiG6J

[stopintime]

here is another video. with higher revs. gopro was on helmet (not chest as before), so more wind.

https://we.tl/t-5kyetZiG6J

Can you show the video in a format which doesn't require that I download/install/accept shit?

[sammy123]

Oh sorry. The size was too big to host it on imgur, so i used dropbox-like wetransfer.com, but i und erstand your concerns. I have compressed the 1080p to 790p, so it is not too big for imgur.
Here is the New link, Direct play,.nondownload:
https://imgur.com/a/AAY430P

[stopintime]

Thanks 

Hard to say exactly, but I think I heard "my sound" at about seconds 57, 45, 17, 6, 2 and 1. Both on and off the throttle, yes?

I still think it's an external sound, that it's not serious and probably quite easy to fix (once located).

Let us know how it develops

[sammy123]

I will update here.
Worst outcome would be that this is the way a Monster 937 sounds. But as the sound was fine the first 700km, i cannot believe this.
In reality the rattle is much more prominent and makes riding the bike not that much enjoyable.

[sammy123]

I was at the Ducati dealer today. The mechanic made a testride with me on pillion seat. This way, i had the chance to exactly tell him what rattle i mean. He once again said that the rattle i am hearing is the normal desmo valvetrain.  
I guess, he is probably right. I asked 2 or 3 times wether he is sure that no rattle (from loose parts for example) besides the valves exist and he said that this would sound different.
Although i have no explanation why i did not have this rattling the first 700km, i must accept this as normal Monster 937 sound. And i must say, i really dont like this mowing machine sound. Sad now to have spent so much money for a bike that i dont like anymore. Maybe a louder aftermarekt exhaust to drown out the rattle? I live in Europe with Euro 5 regulation, so probaly no exhaust loud enough to drown out the rattle is allowed.
I guess Ducati is just not for me I really love the look of the bike and also how it performs, but this annoying sound takes too much away from the driving experience.