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Charlie Magri
Joined: 26 Aug 2008
Posts: 14
Location: Thurrock
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 Posted: Mon Oct 27, 2008 9:52 pm Post subject: Drive belts |
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About a month or so ago my drive belt went on my GTS. Prior to that I had just had a new exhaust and noticed a drop in power. I put it down to the exhaust but soon after the drive belt went and I concluded it was that. I posted a couple of messages on the customs and tuning section of this site at the time.
Anyway, a month later and the bastard has gone again. I've probably done less than 2000 miles. Craig at Scooterworks thinks the other one was probably a dodgy one but obviously it's too late to tell.
Does anyone have any other suggestions. I am known universally for my appalling luck so I don't discount Craigs assumption but at a bleeding oner a pop for the bloody belt plus labour I like to avoid it happening again is if at all I can.  |
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monty9120
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Joined: 15 Nov 2007
Posts: 861
Location: North London
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| Posted: Mon Oct 27, 2008 9:54 pm Post subject: |
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The most common thing is the belt hasnt been fitted correctly. Just to clear it up th exhaust will not make any difference to the belt wear at all
washers have to be in the right place so the belt runs true.
Belt failures do happen. i had one after less the 800 miles locking my rear wheel at over 100mph 
Best to get the bike checked over. if you know what to look for even better
http://gtsownersclub.s4.bizhat.com/viewtopic.php?t=6
have a look on this link check if the transmission is in there to see if anything is a miss 
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AIRMECH
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Joined: 05 Jan 2008
Posts: 260
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| Posted: Mon Oct 27, 2008 11:52 pm Post subject: |
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| Quote: | | but at a bleeding oner a pop for the bloody belt plus labour |
Craig is fuckin` you over sunshine,a malossi belt fitted in my shop only £70 and by a qualified piaggio tech,it`s a 20 minute job 
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CheekyThomas
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Joined: 18 May 2007
Posts: 1374
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| Posted: Tue Oct 28, 2008 1:10 pm Post subject: |
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Depends on what belt is fitted as well... a Malossi belt will be past piaggios recommended wear marker in about 2000miles... a genuine will still be ok after 12,000  |
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AIRMECH
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Joined: 05 Jan 2008
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| Posted: Tue Oct 28, 2008 7:01 pm Post subject: |
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Malossi belts do wear quicker agreed but dont stretch like std ones,I`ve seem them f--ked after 4000 miles,depends whether the pilots got lead in his/hers right hand
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CheekyThomas
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Joined: 18 May 2007
Posts: 1374
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| Posted: Tue Oct 28, 2008 7:29 pm Post subject: |
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The standard ones dont stretch... made by Mitsuboshi the largest belt manufacturer in the world
Malossi ones are awful, over priced rubbish selling off name alone  |
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AIRMECH
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Joined: 05 Jan 2008
Posts: 260
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| Posted: Tue Oct 28, 2008 8:31 pm Post subject: |
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Well maybe they don`t stretch in the area you live,but they do here !perhaps you can explain why my acceleration is slower with a std belt then.Std belts bein` that good and made by the biggest manufacturer of belts in the world but only lasting 800 and 2000 miles,really good.........
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CheekyThomas
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Joined: 18 May 2007
Posts: 1374
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| Posted: Tue Oct 28, 2008 9:47 pm Post subject: |
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Trust me no drivebelt stretches, they wear and get thinner but not stretch. It doesn't matter how hard you ride the belts never abused as the centrifugal clutch means the belt never gets any jarring forces applied. That's why a tiny rubber belt can handle a 850cc vtwins power in the gp800.
Malossi belts show more acceleration as they are narrower so hold in effective lower gearing for longer, but does that make them better? Nope.
I've taken plenty of malossi belts out that have been knackerd in 1/2 the mileage a STD one will do. Genuines are warrantied for 15,000km.
If a bike keeps killing belts its normally a sign of a bad clutch set up, or a contra spring issue. Ie belt slip or belt squeeze. |
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AIRMECH
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Joined: 05 Jan 2008
Posts: 260
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| Posted: Tue Oct 28, 2008 10:01 pm Post subject: |
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That`s fine on a std engine set-up but put stiffer springs on your clutch for higher revvin` starts off the line andyour belt will stretch,I have loads hanging up from my dragsters and they are stretched both std and kevlar,to say they dont stretch....I beg to differ and plenty of tuned bike owners will agree.Malossi recomend belt changes every 6k by the way,so I was told at their factory,but more snappin` on std belts than malossi items,Polini list a belt for GTS`s but no-one has seen one,shame,if they were as good as the dragster/runner items you wouldn`t have belt dilemmas..
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CheekyThomas
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Joined: 18 May 2007
Posts: 1374
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| Posted: Tue Oct 28, 2008 10:13 pm Post subject: |
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If your suffering belt stretching the contra spring is miles to stiff. Think about how the system works... How can you stretch a belt with a proper set up? Both the pulleys move so where's the increase of tension coming from?
Think carefully.... |
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AIRMECH
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Joined: 05 Jan 2008
Posts: 260
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| Posted: Tue Oct 28, 2008 10:33 pm Post subject: |
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Always use std contra springs but never std clutch springs,think about it logically if your engine is pulling 9000 for example as with blue springs on a 180 engine the load of the machine starting at those revs will stretch your belt,you are pulling away in your power band using max torque. normal road use will never use that torque whilst travelling at those revs.The same will apply with any variomatic engine.Normal road use and/or softer clutch springs will give better belt life,then of course you have adjustable clutches especially good for sprinting,ask the guys at PM,PSN and JB belts do stretch.
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Last edited by AIRMECH on Tue Oct 28, 2008 10:49 pm; edited 1 time in total |
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Charlie Magri
Joined: 26 Aug 2008
Posts: 14
Location: Thurrock
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| Posted: Tue Oct 28, 2008 10:46 pm Post subject: |
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| AIRMECH wrote: | | Quote: | | but at a bleeding oner a pop for the bloody belt plus labour |
Craig is fuckin` you over sunshine,a malossi belt fitted in my shop only £70 and by a qualified piaggio tech,it`s a 20 minute job |
***Actually Craigs been doing me a favour. He doesn't stock belts (most of his work is on older vespas) but both times I've nipped down to Vauxhall and got one at Metropolis with his trade card discount. Maybe Metropolis are having a laugh because the first time it came up 120 sovs to the public but with Craigs discount I got it for 85. This one for some reason was 95.
This time Craig fitted it himself and said he had to clean the clutch out cos the belt parts got into it. He also noticed my rollers had squared off and changed them for me. He's always sorted me out properly and he is a top top fridge. He does moan that I drive it too fast and hard. Reminds me of my bleeding mother at times. |
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AIRMECH
Inspector
Joined: 05 Jan 2008
Posts: 260
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| Posted: Tue Oct 28, 2008 10:51 pm Post subject: |
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GTS belts are only around 40 quid genuine,someone is fuckin` you over for sure.
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CheekyThomas
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Joined: 18 May 2007
Posts: 1374
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| Posted: Wed Oct 29, 2008 11:33 am Post subject: |
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What kills belts is top edge deflection and burning of the belt sides from being forced to slip... stretching is never a failure issue.
The worst stretching will do is reduce acceleration through making it upshift too quickly, the maximum stretch on a std belt will be less than 1% in its whole lifetime as it has no fixed pulley to be stretched from, so if the belt gets pulled from the front, it can move the same distance down at the rear which removes the stretching force.
Hold a clutch in a vice, and fit a belt in the pulleys... now try to stretch the belt and see what happens... yep the rear pulleys give way allowing the belt to move down the gap to the bottom, only once the belt is at full travel down the rear pulley can you apply a strong enough force to actually stretch the belt. (which never happens as by that time the bikes in top gear and flat out and doesnt have enough torque to attempt to stretch the belt)
What makes malossi belts survive longer when pushed is the fact they allow more slippage on the pulleys without the charring effect on the edges... this is the reason the competition chaps especially off road autos etc run carbon fibre impregnated belts.
Have you ever tried to snap a belt through stretching it... might be worth a try, but youll need a concrete post and a car with a towbar to help
But ho hum its an argument with no end... its another each to there own final answer really You love em, i hate em... makes the world go round.  |
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Charlie Magri
Joined: 26 Aug 2008
Posts: 14
Location: Thurrock
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| Posted: Wed Oct 29, 2008 8:39 pm Post subject: |
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| AIRMECH wrote: | | GTS belts are only around 40 quid genuine,someone is fuckin` you over for sure. |
The bastards!!!! |
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