Vibration when turning and resonance

Farklepilot

New member
Hi all, new owner here. Just purchased a used 2019 C400X with 7,000k. Test rode a new demo first. The demo had a slight vibration when turning, no resonance noises. Mine has the same vibration but a very bad resonance noise at approx 3500rpm. Anybody know what is causing these issues? Any known fix?
 

omniphil

Member
My C400X is at the dealer getting some things fixed. I listed the bad resonance noise as one of the issues. (It happens if you stay right at 20-24 mph)
I was wondering if it was a normal noise or not. Interesting that the demo unit did not have that. That makes me hope the dealer can fix it as its something not normal. It is incredibly loud.

I also notice the vibration while turning, I figured this was normal as well, I am assuming the weight of the motor is shifting on the rubber mount and it throws more vibrations into the chassis.
 

omniphil

Member
Update on the resonance noise... Looks like there is a rivet that has come loose on the right side somewhere, parts on order from Germany.... (Glad its not a normal noise)
 

Farklepilot

New member
Had a real close look at mine today. Sure looks like the motor mount has collapsed to me? Will take to dealer next few days. mount.jpg
 

Farklepilot

New member
Right side. Took to dealer, we looked at new one and a demo with 1700k. Both were somewhat the same BUT not so far off centre. Rode the demo, has a SLIGHT amount of vibe when turning, a greatly reduced resonance at same rpm. Both totally acceptable. Dealer is going to remove mount and check for torn/worn rubber. Will advise outcome.
 

omniphil

Member
So apparently the loud resonance noise at around 20mph BMW knows about as there is a bulletin out for it. There are no parts available to fix it however.
So i'll have to bring the bike back in at some point but at least a fix is coming, that is good to know.

Bulletin# 65330630-02
 
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Donnus

New member
Very interesting ! Is it possible to post a copy of this bulletin ?
I have the very same issue and the dealer ignores this.
 

omniphil

Member
Very interesting ! Is it possible to post a copy of this bulletin ?
I have the very same issue and the dealer ignores this.

They only gave me the bulletin number unfortunately. They don't usually give out bulletins. Maybe someone at a BMW dealer can look up the bulletin number, I could not find anything on the internet.
 

Farklepilot

New member
My dealer has verified same. No parts available at this time... Good news is BMW has recognized the issue exists ( seems to be half the battle ) and at some point? should be updated motor mounts available.
 
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