Are These Common C400 Issues?

omniphil

Member
I just picked up a C400X (Former C600 Sport owner). I have noticed some oddities that I don't have with my other scooters and was just wondering if they are normal on this platform...

1. Front Brake Lever- You have to pull this quite far to get it to start working unlike the rear brake lever. (This seemed to be a common issue seeing other posts)

2. Loud Resonance Noise - Right at 20 mph if I let off the throttle enough so that I stay cruising at 20 mph there is a very loud groaning noise that sounds like some sort of resonance in the front area of the scooter. I thought this was some sort of airbox noise, but the air box isn't in the front of the scooter.

3. Vibration While Cornering - When going straight the bike is very vibration free (Except the pulsations from the engine) however when I corner to either side there is a vibration that shows itself. It's at a different frequency than the engine. It's easily noticeable.

I also have a bad seat latch and the scroll wheel is broken, those will be fixed by the dealer at the first service.

I haven't seen anyone experimenting with lighter CVT roller weights yet (Or even seen any available to try).
This is usually the first thing I do to my scooters as it really wakes up the acceleration with no loss in top speed.
 

omniphil

Member
Just to add to this...

1. I noticed the 2022 C400X mentioned something about changes to the braking system. (I wonder if this is due to the inconsistency of the 2 brake levers)

2. and 3. I just got my C400 back from the dealer to fix these vibrations issues. There is a bulletin out on it from BMW.
 

Donnus

Member
Just to add to this...

1. I noticed the 2022 C400X mentioned something about changes to the braking system. (I wonder if this is due to the inconsistency of the 2 brake levers)

2. and 3. I just got my C400 back from the dealer to fix these vibrations issues. There is a bulletin out on it from BMW.
2: do you have the bulletin number ?
 

apm6

New member
Normal coolant temperature at highway speeds is approx. 165F. Yesterday, in stop and go traffic with ambient air temp at approx. 46F, coolant temp went up to 212F. Fan kicked in at 210F and dropped temp to 207F. Does anyone else's bike run hot like this? My concern is that if I'm getting this hot when the air temp is in the 40s, I'll be toast in summer heat and the radiator fan will be constantly running trying to lower the coolant temp. I have a note in to the BMW service center asking, but wanted to see if anyone here has had similar issues.
 
Normal coolant temperature at highway speeds is approx. 165F. Yesterday, in stop and go traffic with ambient air temp at approx. 46F, coolant temp went up to 212F. Fan kicked in at 210F and dropped temp to 207F. Does anyone else's bike run hot like this? My concern is that if I'm getting this hot when the air temp is in the 40s, I'll be toast in summer heat and the radiator fan will be constantly running trying to lower the coolant temp. I have a note in to the BMW service center asking, but wanted to see if anyone here has had similar issues.
Hi Apm6, Yes, I noticed as well, while waiting for a one lane closure during road construction. My temperatures were similar. After my fan kicked in, my temp fell to 180F. Did you receive a response from BMW?
 

apm6

New member
Yes, the local service center guy said that as long as the fan comes on, it is operating normally and those temperatures are normal. He did say that I should expect to have the fun running more in the summer if I'm driving in a lot of stop and go traffic. Will be interesting to see how that pans out in the warmer months.
 
Yes, the local service center guy said that as long as the fan comes on, it is operating normally and those temperatures are normal. He did say that I should expect to have the fun running more in the summer if I'm driving in a lot of stop and go traffic. Will be interesting to see how that pans out in the warmer months.
Perfect! Thanks for the update! Look forward to some good rides this season. Thanks!
 

Road Scholar

New member
This is a good post. I’m taking delivery of a GT soon and just asked about the bulletin to fix the vibration. Thanks for sharing.
Fletch
 

aitorgt

New member
Hi riders, I am new to the forum. My gt has 400 km on it and yesterday the fan noise started. The funny thing is that it was in the city at 8 degrees celsius ambient temperature. I imagine that in summer it will seem that we carry an airplane. In my case, if this has no solution when the leasing ends, I will deliver the bike and return to Suzuki.
 

Ian650

New member
Regarding one of the points re front brake lever. Apparently this is characteristic of ABS. I had a similar situation on a Suzuki Bandit 650. I don't know if the change of Front caliper manufacturer will alleviate or get rid of the problem.
 

mgg

Member
Regarding the back brake lever. Mine was extreamly tight when I took my test ride and the front brake lever felt very good. I asked about it and the sales person said he kinda went over to the bike and started pulling it hard. He said he did this many times. I have to say it is still tighter than the front brake lever but it has loosened up a lot.
 

wspollack

Active member
The rear brake lever on my new '23 C 400 GT (delivered about a month ago) seemed to have very little free play. That seemed less than the free play that was present upon delivery of my then-new '22 C 400 GT, either at delivery (June 2022) or the last time I rode it (May 2023). June 2022 was a long time ago, and I don't really remember the initial state of the rear brake lever, so I'm guessing a little bit on that.

The not-a-lot-of-movement situation for the rear lever doesn't really bother me. I'm not that ham-fisted that I can't apply it successfully. Also, over time, as the pads wear in the back, I suspect the lever movement will lengthen.

Regarding the front lever, I suspect there's more movement because it has more work to do, i.e., a more difficult job moving two sets of calipers, through longer brake lines, instead of one (in the back).

Both sets of brakes seem to actually do their job satisfactorily, during the 400+ miles I was able to put on the new '23 before parking it for the winter, so there's nothing here that really concerns me.

However, a few days after I got it, I did perform an old trick (suggested by old bikers, in days of yore): I wrapped a bungee very tightly around the lever -- i.e., pulled in, as if braking -- and let it sit that way for a day or two or three when I wasn't using the bike:

2023-12-01_15-21-16 2.JPG

As in the past with other bikes, this tightened up the lever, i.e., eliminated some of the slack in its movement, made it a bit more like the back brake. I think it causes at least some of the residual air in a system to bubble up out of the brake fluid. Or something like that. Anyway, feel free to try it out, no harm, no foul.
 
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