100% MOT failure rate on '07 MP3 rear shocks
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Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 38977
Location: Pleasant Hill, CA
Wed May 30, 2012 5:16 am quote
A heads-up on the MP3 rear shocks - and other models whose rear shocks have similar adjusting rings.

Just went round to my dealers to get some parts, and he told me how they have so far failed every single one of the '07 MP3s (and a few '08s). All had one particular issue - the adjusting ring on the rear shocks had a crack. We went outside and looked at mine - yup, each adjusting ring had a crack.

We reckon using ACF50 every six months on these unprotected alloy rings should prevent this - as it looks like the cracks are due to corrosion causing a weak point, and bottoming out can then break the ring. With one crack the shocks still work - with two the ring would fly off and the spring would suddenly fully extend.

So as these aren't repairable it's GBP200 for a new pair of shocks. They've done five years heavy duty, so I'm not too disgruntled.

2012_05_30 _05_ DSC01833.jpg

Ossessionato
X10 350
Joined: 12 Nov 2008
Posts: 2959
Location: London
Wed May 30, 2012 5:42 am quote
Cheers, Jim. Must check the ones on the (05) X9.
Moderatus Rana
MP3 250 (sold) MP3 500 (current)
Joined: 11 Jul 2008
Posts: 21608
Location: Nashville, Indiana
Wed May 30, 2012 5:57 am quote
Hmmm. Been out of town and haven't had a chance to really look, but I have a rear shock that failed. Will have to look for cracks.
Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21681
Location: Harriman, Tennessee, Tn
Wed May 30, 2012 5:58 am quote
perfect time to upgrade to the bitubos IMO. a much better shock with ALOT better adjustablity to them in both the preload and shock dampening which you don't have on stock ones.
Enthusiast
MP3 400ie
Joined: 08 Sep 2010
Posts: 92
Location: Andalucía (Spain)
Wed May 30, 2012 6:01 am quote
Thanks for the heads up, Jim. Will be checking this out later on today.
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 38977
Location: Pleasant Hill, CA
Wed May 30, 2012 6:48 am quote
Benelli Boy wrote:
Cheers, Jim. Must check the ones on the (05) X9.
Those are different (although interchangeable) - and should be OK even if seized up. The ones on the '54 X9 250 are fine.
Molto Verboso
2007 Piaggio MP3 250 (sold) and 2009 MP3 400
Joined: 30 Jun 2010
Posts: 1842
Location: Floyds Knobs IN
Wed May 30, 2012 6:50 am quote
Thanks for the info!
I will check mine!
Addicted
MP3 500, Lambretta GP TS1 225
Joined: 16 May 2011
Posts: 620
Location: Toronto, Ont
Wed May 30, 2012 8:25 am quote
Don't forget Hagon shocks:

New rear shocks


A cheaper alternative and I'm happy with mine.



Cheers,
Tross
Ossessionato
X10 350
Joined: 12 Nov 2008
Posts: 2959
Location: London
Thu May 31, 2012 12:25 am quote
Thanks, Jim.
Banned
MP3 500
Joined: 20 Aug 2008
Posts: 4530
Location: Ashburn, Va
Thu May 31, 2012 3:27 am quote
Tross wrote:
Don't forget Hagon shocks:

New rear shocks


A cheaper alternative and I'm happy with mine.



Cheers,
Tross
While good shocks and cheaper, they don't have the adjustment the Bitubos do.
Addicted
MP3 500, Lambretta GP TS1 225
Joined: 16 May 2011
Posts: 620
Location: Toronto, Ont
Thu May 31, 2012 2:42 pm quote
StooterBoy wrote:
Tross wrote:
Don't forget Hagon shocks:

New rear shocks


A cheaper alternative and I'm happy with mine.



Cheers,
Tross
While good shocks and cheaper, they don't have the adjustment the Bitubos do.
One of these days we should have a shoot/ride out to see if they are worth the $200 extra bucks.
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 38977
Location: Pleasant Hill, CA
Thu May 31, 2012 3:03 pm quote
This is misleading - see update below
The new replacement shocks (picked up today) have reverted to the old-style adjuster rings, so much sturdier and should last a lot longer.

Last edited by jimc on Wed Jun 13, 2012 4:34 am; edited 1 time in total
Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21681
Location: Harriman, Tennessee, Tn
Thu May 31, 2012 3:05 pm quote
jimc wrote:
The new replacement shocks (picked up today) have reverted to the old-style adjuster rings, so much sturdier and should last a lot longer.
post a pic please
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 38977
Location: Pleasant Hill, CA
Thu May 31, 2012 3:57 pm quote
Note this is the *wrong shock* see update further down
Part number 649129

2012_05_31 _05_ DSC01835.jpg

2012_05_31 _05_ DSC01837.jpg



Last edited by jimc on Wed Jun 13, 2012 4:33 am; edited 1 time in total
Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21681
Location: Harriman, Tennessee, Tn
Thu May 31, 2012 3:59 pm quote
at least on that new one you can get the wrench in alot easier to adjust it. The top looks different the the original stock ones too.
Addicted
MP3 500, Lambretta GP TS1 225
Joined: 16 May 2011
Posts: 620
Location: Toronto, Ont
Fri Jun 01, 2012 8:03 am quote
old as dirt wrote:
at least on that new one you can get the wrench in alot easier to adjust it. The top looks different the the original stock ones too.
I'd say different supplier, hopefully they last longer the other/older OEM's. One of mine lasted 6 months before the seal blew. The springs were too soft as well for my ample size, but I can't blame that entirely on the shocks

Cheers,
Tross
Hooked
Puch SRA150, MP3 400, Moto Guzzi 750 Nevada, BMW K75S
Joined: 22 Jul 2008
Posts: 264
Location: Glendale AZ (was Albury NSW)
Fri Jun 08, 2012 6:01 am quote
Re: 100% MOT failure rate on '07 MP3 rear shocks
jimc wrote:
Just went round to my dealers to get some parts, and he told me how they have so far failed every single one of the '07 MP3s (and a few '08s). All had one particular issue - the adjusting ring on the rear shocks had a crack. We went outside and looked at mine - yup, each adjusting ring had a crack.
A $3 can of dewatering fluid, applied occasionally to the shock spring adjuster, would have stopped it from corroding and ultimately breaking.

If you look carefully at your pic you will see a separate layer of corrosion which has built up inside the ring. The pressure has finally caused the under-engineered ring to break - see how the crack has widened?



$3 of prevention must surely be worth $300 of replacement parts...
Ossessionato
Scarabeo 500GT(hers), `07 250 MP3, `09 400 MP3
Joined: 13 Oct 2008
Posts: 2592
Location: Kingman, Az.
Fri Jun 08, 2012 8:02 am quote
I figure all that crack is caused by is corrosion from salt air and not doing something about it periodically, like spraying it with WD40. I never adjust my shocks and they have no corrosion so far because I live in a dry climate, put MP3s inside when I'm not riding them. They spend more time inside than outside. No metal outside here rusts.
Enthusiast
MP3-250, GTS-250
Joined: 17 Jan 2012
Posts: 60
Location: San Diego, CA
Sat Jun 09, 2012 10:23 am quote
I feel a little left out -- our shock rings have no sign of cracks after 12K miles, even here in seaside San Diego. Of course, we keep the scooter in the garage, which may support the corrosion explanation.
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 38977
Location: Pleasant Hill, CA
Wed Jun 13, 2012 4:32 am quote
Update
Update - the new shock shown above is the *wrong one*. Bloody Fowlers must have had an odd one on a shelf as it arrived in a big Jiffy bag albeit with the right part number written on that. Confirmed by the second shock arriving today which is identical to the original type.

So lots of ACF-50 and grease going on that before fitting.

Last edited by jimc on Wed Jun 13, 2012 4:35 am; edited 1 time in total
Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21681
Location: Harriman, Tennessee, Tn
Wed Jun 13, 2012 4:35 am quote
jimc wrote:
Update - the new shock shown above is the *wrong one*. Bloody Fowlers must have had an odd one on a shelf as it arrived in a big Jiffy bag albeit with the right part number written on that. Confirmed by the second shock arriving today which is identical to the original type.

So lots of ACF-50 and grease going on that before fitting.
well that plain sucks on the not the right one.
Enthusiast
MP3-250, GTS-250
Joined: 17 Jan 2012
Posts: 60
Location: San Diego, CA
Wed Jun 13, 2012 6:01 am quote
Re: Update
jimc wrote:
So lots of ACF-50 and grease going on that before fitting.
Definitely seems to be a humidity/corrosion thing -- I see you were in London and now the Bay Area? My 505-sailing friends in southern UK and in S.F. say a "fine day" is when water's not actually falling, and the other guys w/ring problems seem to be in wet places too. Here on the mesa over San Diego (10 mi inland) we're lucky to get 10" a year, with 6 totally dry months, and our '07 rings still are bright and shiny. Should warn folks not to get any spray-on anti-rust on the rear brake disc, though! (While it might collect dust, no reason one couldn't rub rings with waterproof grease before installing -- also working some under the ring, which seems to be the critical area.)

Has anyone heard a report of a ring failing on the other side and breaking completely, which would be VERY bad for the scooter's handling?
Enthusiast
MP3 250, Kawasaki Ninja 250R
Joined: 03 Nov 2009
Posts: 73
Location: UK
Mon Jun 18, 2012 1:47 pm quote
Yikes... thanks for the heads up and hints!
Addicted
MP3 Piaggio 2007
Joined: 17 Jul 2007
Posts: 574
Location: Austin, Texas
Sun Jun 24, 2012 1:27 pm quote
cracked collars
Thanks Jim for the important find. I remember we are supposed to lube and move those to keep them from freezing up. I'll check mine out .
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