Small crack nose/cone fairing - MVAgusta.net
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post #1 of 27 (permalink) Old 05-01-2019, 06:24 PM Thread Starter
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Small crack nose/cone fairing

Hi,

this happened to me second time now, by accident I have cracked the small plastic piece in the middle just above the headlight. How would you go about fixing it without getting a new cone fairing? I have tried a few things before but nothing seemed to hold it good enough.

Thank you.
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post #2 of 27 (permalink) Old 05-01-2019, 10:40 PM
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Plastics can be tough to repair but I've had success repairing my belly fairing when the exhaust burned a bubble in it. I used epoxy resin and some woven fiberglass cloth to reinforce the area on the back. I scuffed the plastic very well and cleaned it with acetone. Several layers of the epoxy/cloth did the trick and I used some body putty on the front surface. Primer and paint finished the job.


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post #3 of 27 (permalink) Old 05-02-2019, 12:10 AM
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+1 ^^^^

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post #4 of 27 (permalink) Old 05-02-2019, 05:37 AM
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Building up layers behind that piece will interfere with the fit of the windscreen.

Personally, I would take it to someone who does plastic welding.
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post #5 of 27 (permalink) Old 05-02-2019, 06:19 AM
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I've had a play with plastic welding with some success - albeit not in areas as directly visible as that.

You can buy proper kits but you can also get very good results with a soldering iron and cable ties I bought a cheap fairing from ebay to practice on and then had a go for real.

Alternatively, have a chat with a car body repair shop - they will have experience on repairing plastic bumpers etc and will also be able to paint for you.
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post #6 of 27 (permalink) Old 05-02-2019, 09:13 AM
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Bigger question is "why does it keep cracking?". Unless you are experiencing impact, as in a crash, that part should not just "crack" on its own. There may be some stress in the mounting, a bent stay perhaps, that is causing the crack to form.

You need to determine what is causing the crack in the first place, or you will keep having it occur.
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post #7 of 27 (permalink) Old 05-02-2019, 09:19 AM
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These usually crack when individuals remove them from the bike and then remove the windscreen. That windscreen provides a lot of support and prevents twisting which is what usually breaks that thin bridge.
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post #8 of 27 (permalink) Old 05-02-2019, 03:32 PM
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Don’t know what it is like in your country, but here we have bumper (fender) repair shops that repair that sort of thing, then follow up with a chip repair service with an airbrush for the paint repair.
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post #9 of 27 (permalink) Old 05-02-2019, 04:21 PM
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Quote:
Originally Posted by silentservice703 View Post
These usually crack when individuals remove them from the bike and then remove the windscreen. That windscreen provides a lot of support and prevents twisting which is what usually breaks that thin bridge.
Wow, seems I got lucky when doing mine. In other words be very careful when doing it?

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post #10 of 27 (permalink) Old 05-02-2019, 10:43 PM
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You have to experiment with perhaps some test pieces from another bike since not all plastics are the same, but I have fixed both glass and plastic fairings using the following procedure:

1) lightly "V" out the crack front and back with a Dremel tool and a cone bit. The opposing sides of the crack should still meet, but there will now be a "valley" halfway through the fairing on front and back along the crack.
2) fill the crack front and back with 1/16 fiberglass strand - I use the stuff from Fiberglast https://www.fibreglast.com/product/1...ers_29/Fillers
Aircraft Spruce also has this stuff https://www.aircraftspruce.com/catal...lledfibers.php but they don't note the size
3) make sure that the glass strand is packed firmly into the "V" and is slightly proud of the surface of the fairing
4) Flood the packed glass strand with thin cyanoacrylate glue, also known as super glue - I like this stuff https://www.zapglue.com/ca
5) block sand the area level and apply more glass/CA if needed
6) fill, prime and finish the entire part
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