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C 400 X/GT: Rear Fender/Mudguard -- My DIY Instructions (Was Help Wanted [SOLVED])

wspollack

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I ordered the rear fender/mudguard for my '23 C 400 GT a couple of weeks ago, and it arrived the other day. No particular reason, except that it was cheap, a few other folks here have one already (I think) or have one on order, and seems to me like keeping crud off the underside of the bike is a reasonably good idea.

This is the one I ordered from some AliExpress vendor (courtesy of the link provided by @jokerface in post https://www.bmw-scooters.com/threads/hand-guards.2775/post-27591, in a thread primarily about handguards):


(The price goes up every time I look at it. I think AliExpress uses cookies, among other things, to raise the price of items along with what it thinks is your interest in a type of product. I bought a battery-operated, i.e., self-contained, tire pump that shuts itself off when the specified pressure in reached for $5.49 a month or so ago. If I look at that or similar products now, it's in the $20 range.)

And here's what it looks like in person -- a piece of plastic, a slide-on bolt capture thingy, and a bolt (that's on top of my recycling container, for a nice contrast):

fender 1.webp

Here are two pics of the area out back where it will reside, first a stock pic and second a sort of test-fit positioning pic:

fender 2.webp

fender 3.webp

I have two questions related to its installation:

1) I can see that the convoluted area over on the right, at the front, fits in a depression in the existing plastic. And that a stock screw matches a hole in the new plastic at that spot.

My question on this is, when removing that screw -- the one designated by the orange arrow in my middle picture -- to reinsert it through the new mudguard, will any stock part(s) fall to the ground, or in a black hole, or require curse words to line up again? That is, anyone know if anything is behind that screw (other than maybe a stock screw-holder gizmo, if it's just there to hold two stock pieces of plastic together)?

2) Regarding that new screw-holder clamp thingy, I don't see how it can slide onto anything in the appropriate orientation.

That is, if you look at the mudguard hole in the upper right in the first pic, that will wind up sort of parallel to the ground, when the mudguard is in place (or so it seems to me). I have indicated what I think is that hole's final resting place by the green arrow in the middle pic. If I have that orientation correct, the clamp will have to slide sort of sideways, but the only edge in that area is mostly vertical. Am I supposed to drill a hole in that existing area (that little ramp area by the arrow), and put the clamp in there, or beneath it, or what?

If anyone with this mudguard installed has or can take a photo of that clamp's final positioning back there I'd appreciate it tremendously.

Thanks all.
 
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Just a short note for today, and I'll post longer installation information and pics maybe tomorrow.

@jokerface helped me out tremendously last night and today, with pictures, links, and comments. It turns out that with some C 400 GT models, you have to drill a hole. I'll have more to say about this, but for now: a big THANKS to @jokerface!
 
Two days ago, I completed my installation of that aftermarket rear fender/mudguard, and I just finished updating my C 400 GT gallery with photos, explanatory captions, and links. These new 12 images start here in my gallery:


If anyone wants just the highlights:


1) This is the product that @jokerface and I ordered (as pictured in earlier photos in this thread):



2) On my '23 C 400 GT, I needed to drill a new hole in a stock piece of plastic (and, as you can see, it only took me two tries to get the location -- fairly critical -- correct). This hole may not be necessary on older C 400 GTs, i.e., they may have an existing bolt there:

2024-10-25_14-08-52 2.webp


3) I needed to add a spacer (I used a spare M6 x 4mm, but 6mm would be better) in between the new and old parts, as centering the back of the fender is not a given, and how the forward part of the left side of the fender lays down -- the right side is fixed in position by an existing bolt -- affects the position of the rear portion of it:

Fender-spacing 2.webp


4) After a few hours' work, it came out well:

2024-10-25_15-29-19 2.webp


As I say, I go into more detail, and have more pics and detailed explanations, in my gallery.
 
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@wspollack
Thanks! As always great write up of this modification! Even better in your picture gallery. I like this option and am considering it now that I know all the in's and out's it make's that desision so much easier.
 
@wspollack
Thanks! As always great write up of this modification! Even better in your picture gallery. I like this option and am considering it now that I know all the in's and out's it make's that desision so much easier.
As always, thanks for the kind words. I try to update my gallery with sufficient detail to allow anyone to duplicate my work, if so desired.

And speaking of detail, because I'm a little persnickety, here's what I ordered last night:



Okay, so I'll only need one of those 20 spacers, but, hey, it's nice to have spare hardware lying around, and this way I'll get to center the fender better.
 
As always, thanks for the kind words. I try to update my gallery with sufficient detail to allow anyone to duplicate my work, if so desired.

And speaking of detail, because I'm a little persnickety, here's what I ordered last night:



Okay, so I'll only need one of those 20 spacers, but, hey, it's nice to have spare hardware lying around, and this way I'll get to center the fender better.
I also have a 2023 and ordered this fender. I was wondering if you ever determined what size spacer is needed to center it best? I know you ordered a couple different sizes.
 
I also have a 2023 and ordered this fender. I was wondering if you ever determined what size spacer is needed to center it best? I know you ordered a couple different sizes.
Oops, sorry, I mentioned this in some new pics at the end of my gallery, but not here: the 6mm spacer worked perfectly for me.
 
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