Mon, 10 Oct 2022 02:16:38 +0000

Member
2008 MP3 250ie and 2009 MP3 Sport 500 (Gilera Fuoco)
Joined: Thu, 31 Mar 2022 06:33:54 +0000
Posts: 33
Location: WA, USA
 
Member
2008 MP3 250ie and 2009 MP3 Sport 500 (Gilera Fuoco)
Joined: Thu, 31 Mar 2022 06:33:54 +0000
Posts: 33
Location: WA, USA
Mon, 10 Oct 2022 02:16:38 +0000 linkquote
Just wonder if anyone in the forum has a belt snapped at high speed (70+mph) before?
If so, what might be the problem (beside speeding)?

I got snapped belt just after 1000miles. And it smelled like burnt rubber. Contaminated clutch heating up? Belt heated up due to high speed? Defective belt?

Please share your experience
Mon, 10 Oct 2022 04:40:34 +0000

Hooked
Beo 50 2t, Beo 500GT, Mojito 125
Joined: Sat, 30 May 2015 10:00:32 +0000
Posts: 454
Location: Chelyabinsk, Russia
 
Hooked
Beo 50 2t, Beo 500GT, Mojito 125
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Posts: 454
Location: Chelyabinsk, Russia
Mon, 10 Oct 2022 04:40:34 +0000 linkquote
First of all, was it Dayco, or a nameless belt from Aliexpress? Next, don't you miss an idler pulley?
Mon, 10 Oct 2022 17:17:50 +0000

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: Sun, 26 Aug 2007 20:16:15 +0000
Posts: 41692
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: Sun, 26 Aug 2007 20:16:15 +0000
Posts: 41692
Location: Pleasant Hill, CA
Mon, 10 Oct 2022 17:17:50 +0000 linkquote
I've had that happen years ago on my Fuoco. The J Costa variator had worn its centre bushing, and the variator pulleys were wobbling about putting huge stress on the belt as I was going WOT in the English countyside. Jammed the rear tyre for a moment, which thankfully released. Luckily there was a pub 200yds away, where I spent a pleasant hour before the nice AA man turned up. Belt was OEM, only 100 miles or so on it.

Lesson - if you're running a J Costa variator, replace that centre bushing every time you replace weights.
Tue, 11 Oct 2022 02:16:33 +0000

Member
2008 MP3 250ie and 2009 MP3 Sport 500 (Gilera Fuoco)
Joined: Thu, 31 Mar 2022 06:33:54 +0000
Posts: 33
Location: WA, USA
 
Member
2008 MP3 250ie and 2009 MP3 Sport 500 (Gilera Fuoco)
Joined: Thu, 31 Mar 2022 06:33:54 +0000
Posts: 33
Location: WA, USA
Tue, 11 Oct 2022 02:16:33 +0000 linkquote
Jah wrote:
First of all, was it Dayco, or a nameless belt from Aliexpress? Next, don't you miss an idler pulley?
Thank you, I do not think the belt is the problem. Not less than 1000miles, that is. I got it from a vendor that claims they got it from factory also supplying OEM part. I got another 250 MP3 that has 8000 miles (same vendor) belt without any problem
jimc wrote:
the variator pulleys were wobbling about putting huge stress on the belt as I was going WOT in the English countyside
I just asked the company that provided me and they also thought it's the misalignment on the pulley and clutch.
This makes sense. I will need to check this again.

Any tips to check the alignment? How do you know if there is an issue like 'wobbling' ? The fuoco engine does vibrate a lot and it's hard to see if it's from the transmission or the engine.
Wed, 12 Oct 2022 13:14:06 +0000

Ossessionato
Gilera Fuoco 500ie
Joined: Sun, 11 Oct 2009 13:35:31 +0000
Posts: 4411
Location: Netherlands Olst
 
Ossessionato
Gilera Fuoco 500ie
Joined: Sun, 11 Oct 2009 13:35:31 +0000
Posts: 4411
Location: Netherlands Olst
Wed, 12 Oct 2022 13:14:06 +0000 linkquote
placed the belt wrong way around?

Letters most be readlable and arrow pointing to the front
Wed, 12 Oct 2022 16:42:29 +0000

Addicted
2015 MP3 500 ie Business
Joined: Tue, 29 Oct 2019 17:22:26 +0000
Posts: 911
Location: Belgium
 
Addicted
2015 MP3 500 ie Business
Joined: Tue, 29 Oct 2019 17:22:26 +0000
Posts: 911
Location: Belgium
Wed, 12 Oct 2022 16:42:29 +0000 linkquote
^This. Arrow must point in the same direction as rotation of engine.

If belt is placed with arrow against rotation, then the belt will wear and fail very quickly.

Same concept as unidirectional tires.
Fri, 14 Oct 2022 03:59:12 +0000

Hooked
Beo 50 2t, Beo 500GT, Mojito 125
Joined: Sat, 30 May 2015 10:00:32 +0000
Posts: 454
Location: Chelyabinsk, Russia
 
Hooked
Beo 50 2t, Beo 500GT, Mojito 125
Joined: Sat, 30 May 2015 10:00:32 +0000
Posts: 454
Location: Chelyabinsk, Russia
Fri, 14 Oct 2022 03:59:12 +0000 linkquote
If the tires aren't exploded if installed "the other way", why should the belt do so?
Fri, 14 Oct 2022 09:24:52 +0000

Addicted
2015 MP3 500 ie Business
Joined: Tue, 29 Oct 2019 17:22:26 +0000
Posts: 911
Location: Belgium
 
Addicted
2015 MP3 500 ie Business
Joined: Tue, 29 Oct 2019 17:22:26 +0000
Posts: 911
Location: Belgium
Fri, 14 Oct 2022 09:24:52 +0000 linkquote
IF rotation didn't matter, do you really think Piaggio would even bother painting the arrows on the belt? OR maybe Piaggio had too much white paint laying around?

The cords inside belt separate & disintegrate if improperly installed.

Here is an example of a belt that failed due to being installed in the wrong direction.

Normal used belt on the left, failing belt on the right.



Fri, 14 Oct 2022 23:24:15 +0000

Hooked
2019 MP3 500 Sport
Joined: Wed, 26 Sep 2012 21:33:29 +0000
Posts: 196
Location: California
 
Hooked
2019 MP3 500 Sport
Joined: Wed, 26 Sep 2012 21:33:29 +0000
Posts: 196
Location: California
Fri, 14 Oct 2022 23:24:15 +0000 linkquote
sbaert wrote:
IF rotation didn't matter, do you really think Piaggio would even bother painting the arrows on the belt? OR maybe Piaggio had too much white paint laying around?
I have a friend that works at Pirelli engineering on motorcycle tires. Directional stuff matters enormously. They design a lot of stuff based on directional stress.
Wed, 19 Oct 2022 04:16:05 +0000

Hooked
Beo 50 2t, Beo 500GT, Mojito 125
Joined: Sat, 30 May 2015 10:00:32 +0000
Posts: 454
Location: Chelyabinsk, Russia
 
Hooked
Beo 50 2t, Beo 500GT, Mojito 125
Joined: Sat, 30 May 2015 10:00:32 +0000
Posts: 454
Location: Chelyabinsk, Russia
Wed, 19 Oct 2022 04:16:05 +0000 linkquote
Regarding thread, indeed. But the tire gets its load in both directions: one under torque, the other under braking. Same with the belt: it hardly would withstand engine/wheel braking if it gets damaged under "reverse" load.

BTW, there are tires which are installed one way to front, and another way to rear wheel.

I'm totally agree that there are reasons to install things the correct way. But I'm not agree that wrong way should cause bad things as ripped belt.
Wed, 19 Oct 2022 05:51:54 +0000

Hooked
2020 Liberty 150, 2020 MP3-500
Joined: Tue, 06 Oct 2020 17:35:13 +0000
Posts: 469
Location: Reno
 
Hooked
2020 Liberty 150, 2020 MP3-500
Joined: Tue, 06 Oct 2020 17:35:13 +0000
Posts: 469
Location: Reno
Wed, 19 Oct 2022 05:51:54 +0000 linkquote
It does matter on some belts, the seam can delaminate on the outer layer turning the wrong direction
A scooter belt changes radius, spins fast & gets hot
Worst case operating conditions
Wed, 19 Oct 2022 18:58:02 +0000

Hooked
2008 fuoco
Joined: Sun, 19 Jul 2015 10:45:16 +0000
Posts: 437
Location: United Kingdom.
 
Hooked
2008 fuoco
Joined: Sun, 19 Jul 2015 10:45:16 +0000
Posts: 437
Location: United Kingdom.
Wed, 19 Oct 2022 18:58:02 +0000 linkquote
When i got my fuoco it had been fitted with a new belt luckly i don't trust other peoples work and checked, it was on the wrong way funny how people ignore directional arrows . I even had to take the car back to the tyre fitters after finding the new tyre which was a directional one was on the wrong way round .
Fri, 28 Oct 2022 03:02:07 +0000

Member
2008 MP3 250ie and 2009 MP3 Sport 500 (Gilera Fuoco)
Joined: Thu, 31 Mar 2022 06:33:54 +0000
Posts: 33
Location: WA, USA
 
Member
2008 MP3 250ie and 2009 MP3 Sport 500 (Gilera Fuoco)
Joined: Thu, 31 Mar 2022 06:33:54 +0000
Posts: 33
Location: WA, USA
Fri, 28 Oct 2022 03:02:07 +0000 linkquote
Well, I checked everything. Variator straight, clutch straight, use the laser leveler to check lol. No play.

So the only thing I am not sure is the direction of the belt. I am usually meticulous with the records but somehow for the fuoco , I didn't write down that I DID check the direction after install.

Well I guess that's it. I have 50/50 chance and I was unlucky. I blame the mistake on the stiff clutch. I did it yesterday and it was mighty stiff. By the time I could get the belt into the clutch, I was so tired I can't even think about anything else. Thankfully, I remember all the kind replies on this forum and checked it.

Thanks again!

Also on the topic of directional tire, I'm sure I just mounted the Michelin City Grip 2 , where pattern of the front is completely reversed from the rear. I'm sure it's strong in the direction it was intended to. For example, front is braking, and rear is accelerating; completely reversed.
   

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