Author Topic: Material used for rear fender LM2  (Read 4933 times)

Offline Lumberjack

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Material used for rear fender LM2
« on: March 18, 2016, 06:33:55 PM »
Hi guys,
I have a Le Mans2 with a crack in the rear fender. ( Under the seat ) :sad:
Unlike the front fender it isn't plastic, but neither do i see any traces of polyester....

Is there anybody who can tell me what material it is made off?
Or how i can repair it?

Thanks for the attention.
John

Le Mans 2 1979
Honda Big One 1998
Ducati 900 SS 1993
HD Heritage 1991
Suzuki Gs750 1977

Offline bigbikerrick

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Re: Material used for rear fender LM2
« Reply #1 on: March 18, 2016, 07:05:53 PM »
are you sure it isnt plastic?
Rick
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Offline dsrdave

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Re: Material used for rear fender LM2
« Reply #2 on: March 18, 2016, 07:17:05 PM »
It is plastic.  Drill a hole at the end of the crack, groove the crack out on both sides and repair with epoxy.
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Offline Tom

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Re: Material used for rear fender LM2
« Reply #3 on: March 18, 2016, 07:23:24 PM »
 :1: on plastic.  What kind?  Not sure.
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Offline Tom

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Re: Material used for rear fender LM2
« Reply #5 on: March 18, 2016, 08:20:53 PM »
Yeah, any epoxy putty/plastic filler should work on the crack.
From the Deep Deep South out in left field.  There are no stupid questions.  There are however stupid people asking questions.  🤣, this includes me.  😉 Hawaii.

Offline Arizona Wayne

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Re: Material used for rear fender LM2
« Reply #6 on: March 18, 2016, 10:11:05 PM »
Yeah, any epoxy putty/plastic filler should work on the crack.



It's not really plastic, it's vinyl, but you can be like everybody else and call it plastic.  :smiley:

Offline Lumberjack

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Re: Material used for rear fender LM2
« Reply #7 on: March 19, 2016, 06:06:59 AM »
are you sure it isnt plastic?
Rick

No, i'm not sure Rick, just thought it wasn't because the side panels are plastic and the fender is, in my opinion, something different.
Le Mans 2 1979
Honda Big One 1998
Ducati 900 SS 1993
HD Heritage 1991
Suzuki Gs750 1977

Offline Lumberjack

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Re: Material used for rear fender LM2
« Reply #8 on: March 19, 2016, 06:23:26 AM »
Thank you all for the swift reply  :bow:

@dsrdave : already drilled the hole and grooved the crack out, now i will try to find something like JB Weld (Canuck750)

@canuck750 : unfortunately we can't buy it here in Europe. Will try to find something likely, maybe Loctite...

Anyway, thanks again to you all.
I will post a comment with the final result/solution, so it can be a help for other guys with the same problem.
Le Mans 2 1979
Honda Big One 1998
Ducati 900 SS 1993
HD Heritage 1991
Suzuki Gs750 1977

Offline dsrdave

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Re: Material used for rear fender LM2
« Reply #9 on: March 19, 2016, 07:12:57 AM »
Any reputable name brand of epoxy should work well.  I stay away from the one minute stuff.  I use a standard marine grade epoxy, I also would mix some micro balloons in with it to reduce weight and it makes it a bit easier to work with and sand, the micro balloons are not necessary though.  Good luck with the repair.
2-850T, 2-1000 convert/hacked, V11 sport, V50, centauro, '97 sport 1100, '71 V7 ambo, '76 850 Lemans,CX100,"83 LM III,1000SE, '91 LM V, '07 Griso, '53 super alce,moto parilla, zigolo, Lodola 175,and 235,  '07 norge, '67 stornello, 57galletto, Nuovo Falcone, 66 ISDT, 52 Airone sport, cafe sport

Dobermann

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Re: Material used for rear fender LM2
« Reply #10 on: March 19, 2016, 07:47:48 AM »
Also I would search fo someone who can "weld" plastic. I have used such a repair on my motocross motorcycle's tank.

Offline dsrdave

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Re: Material used for rear fender LM2
« Reply #11 on: March 19, 2016, 08:02:37 AM »
Wrong kind of plastic to weld...
2-850T, 2-1000 convert/hacked, V11 sport, V50, centauro, '97 sport 1100, '71 V7 ambo, '76 850 Lemans,CX100,"83 LM III,1000SE, '91 LM V, '07 Griso, '53 super alce,moto parilla, zigolo, Lodola 175,and 235,  '07 norge, '67 stornello, 57galletto, Nuovo Falcone, 66 ISDT, 52 Airone sport, cafe sport

Offline Groover

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Re: Material used for rear fender LM2
« Reply #12 on: March 19, 2016, 08:07:16 AM »
I like to use JB weld 5 minute clear epoxy for this kind of repair, but I also cover the break with fiberglass cloth. The cloth sort of "melts" (not really, but it disappears) once you lay it over the wet epoxy and use an epoxy brush to go over it. I'd do a few layers.

Good luck.
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Offline Groover

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Re: Material used for rear fender LM2
« Reply #13 on: March 19, 2016, 08:10:47 AM »
You can find fiberglass cloth at hobby stores where they deal with R/C airplanes typically. Or online. There are several weights, typically indicated by the coarseness of the weave.
1981 Moto Guzzi V1000G5
1987 Moto Guzzi LM1000SE, a
1987 Moto Guzzi LM1000SE, b
1980 Piaggio Vespa P200E
1980 Piaggio Vespa P125X
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Online Dukedesmo

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Re: Material used for rear fender LM2
« Reply #14 on: March 19, 2016, 08:29:14 AM »
I've had good results repairing plastic & carbon fibre using Q-bond; http://www.ebay.co.uk/itm/Q-BOND-QB2-ULTRA-STRONG-ADHESIVE-AND-FILLER-REPAIRS-IN-TEN-SECONDS-/301433714308?_trksid=p2141725.m3641.l6368

'Super-glue' based so sets in seconds and I've found it more permanent that 'Araldite' (epoxy), the only downside is that you can't mould it when you apply as it sets instantly and leaves a rough surface so you need t sand it down rather than 'sculpt' whilst tacky.

Also works well on (non structural) alloy repairs.
« Last Edit: March 19, 2016, 08:29:51 AM by Dukedesmo »
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Offline blackcat

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Re: Material used for rear fender LM2
« Reply #16 on: March 19, 2016, 11:31:15 AM »
I don't know how bad a crack this is but I too danced with a cracked rear fender on my CX in the same location. I patched it a couple of times until one day I hit the wrong bump in the road and the whole thing fell off including my license plate. Fortunately someone in a car stopped me and I retrieved the whole mess. After that I just bought a new rear fender and called it a day, so if it's a bad crack and the repair keeps cracking, beware.
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Offline bigbikerrick

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Re: Material used for rear fender LM2
« Reply #17 on: March 19, 2016, 01:21:51 PM »
I have been doing plastic welding/repair for a few years , most of the plastic Guzzi uses or used back in the 80s-90s I find to be ABS. you can buy a  bottle of abs glue like used for  plumbing repairs, and test a small spot on the underside of the fender. it should "melt" the plastic some. you can use the abs glue to reinforce the fender from underneath, using stainless steel screen to bridge the crack. a good epoxy will also work, clean and degrease the part real good before starting any repair.
Rick.
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Offline Tom

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Re: Material used for rear fender LM2
« Reply #18 on: March 19, 2016, 01:30:33 PM »
NOPE!  Arizona Wayne says it's "vinyl".
« Last Edit: March 19, 2016, 01:31:11 PM by Tom »
From the Deep Deep South out in left field.  There are no stupid questions.  There are however stupid people asking questions.  🤣, this includes me.  😉 Hawaii.

Offline Lumberjack

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Re: Material used for rear fender LM2
« Reply #19 on: May 23, 2016, 04:24:45 PM »
Hi guys,
It's been some time since i asked your advice concerning my rear fender.
I went to a specialised polyester/epoxy shop (VOS Chemicals) where they did some tests on the fender.
They told me it was made of polyester, but moulded under high pressure.
That's why you don't see any fiberglass cloth.
They assured me that i could repare it with polyester or epoxy, both with glass cloth.
I chose epoxy and although it was my first time with that stuff, result is a bulletproof fender.
I will try to post some pics.

Anyway, thanks again to you all.











Le Mans 2 1979
Honda Big One 1998
Ducati 900 SS 1993
HD Heritage 1991
Suzuki Gs750 1977

oldbike54

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Re: Material used for rear fender LM2
« Reply #20 on: May 23, 2016, 04:27:31 PM »
Hi guys,
It's been some time since i asked your advice concerning my rear fender.
I went to a specialised polyester/epoxy shop (VOS Chemicals) where they did some tests on the fender.
They told me it was made of polyester, but moulded under high pressure.
That's why you don't see any fiberglass cloth.
They assured me that i could repare it with polyester or epoxy, both with glass cloth.
I chose epoxy and although it was my first time with that stuff, result is a bulletproof fender.
I will try to post some pics.

Anyway, thanks again to you all.













 So like "roto-molded nylon" then .

 Dusty

Offline Lumberjack

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Re: Material used for rear fender LM2
« Reply #21 on: May 23, 2016, 04:41:39 PM »
@oldbike54 : i have no idea what 'roto-molded nylon' is.

They explained me a few steps in the making proces :
1. A layer of resin is sprayed in a mold.
2. Fiberglass cloth is placed in the resin.
3. Another layer of resin is sprayed on the cloth.
4. Everything is pressed together.
Le Mans 2 1979
Honda Big One 1998
Ducati 900 SS 1993
HD Heritage 1991
Suzuki Gs750 1977

oldbike54

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Re: Material used for rear fender LM2
« Reply #22 on: May 23, 2016, 04:48:27 PM »
@oldbike54 : i have no idea what 'roto-molded nylon' is.

They explained me a few steps in the making proces :
1. A layer of resin is sprayed in a mold.
2. Fiberglass cloth is placed in the resin.
3. Another layer of resin is sprayed on the cloth.
4. Everything is pressed together.

 Not the same then , sorry . Roto-molded nylon is used in some modern fuel tanks and fenders .

 Dusty

Offline PeteS

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Re: Material used for rear fender LM2
« Reply #23 on: May 23, 2016, 06:56:53 PM »
I guess I missed the start of this. I would have said fiberglass. The polyester refers to the type of resin. As Lumberjack discovered you can use either polyester or epoxy resin for the repair along with some more fiberglass cloth.

I didn't appreciate the difference in the resins until stories of fiberglass gas tanks failing with ethanol fuel. My Norton has an epoxy resin fiberglass factory tank. Guys who bought aftermarket polyester resin fiberglass tanks where getting their carbs clogged up with the melting resin. The epoxy stands up to the ethanol much better but still gets attacked. No clogged carbs though.

Pete
« Last Edit: May 23, 2016, 07:00:26 PM by PeteS »

Offline Tom

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Re: Material used for rear fender LM2
« Reply #24 on: May 23, 2016, 06:57:44 PM »
It's like finishing off a surfboard.  Fiberglass/resin over a surfboard blank.
From the Deep Deep South out in left field.  There are no stupid questions.  There are however stupid people asking questions.  🤣, this includes me.  😉 Hawaii.


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