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 Post subject: Yamaha Aerox variator rollers
 Post Posted: Thu Jul 22, 2010 3:53 pm 
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Joined: Sun Dec 14, 2008 4:23 pm
Posts: 8
Hi, I have an Aerox 100 which when travelling at low speeds feels like the rear
tyre has lots of flat spots ( feels nearly as bad as riding over a cattle grid!) I`ve
been told this is probably the belt needs changing.

I am going take off the casing and variator pulley and change the belt. Whilst I am
doing this it would make sense to check and possibly change the variator rollers.

Why do rollers get flat spots?

What difference does the weight make? I`ve seen rollers to fit my model Aerox ( I
believe they are 15mm x 12mm ) with weights varying from 9g to 3.5g.

Many thanks in advance for all replies


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 Post subject: Re: Yamaha Aerox variator rollers
 Post Posted: Thu Jul 22, 2010 6:01 pm 
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Joined: Fri Sep 15, 2006 9:07 pm
Posts: 2273
Location: essex
You normaly change rollers & belt together anyway :idea:
The rollers get flat spots because they wear that way , They get dirty get slightly stuck and slide instead of rolling , This makes a tini flat spot which in time will get bigger as it will now get stuck at this point ( reving a T&G when stoped also wears them out quicker )
Belt & rollers are consumables so get changed at 6000-9000 service intervals depending on scooter :!:

Your rollers are 15 x 12 - 9 grams , If your bike is standard then stick to standard weight , If you have a sports pipe then fitting slightly lighter one's might help :?:
Stick with genuine yamaha belt/rollers & not the malossi rubbish .

Here's a guide on fitting them - http://beedspeed.com/html-pages/HowToFi ... eights.htm


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 Post subject: Re: Yamaha Aerox variator rollers
 Post Posted: Thu Jul 22, 2010 7:35 pm 
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Joined: Sun Dec 14, 2008 4:23 pm
Posts: 8
Thanks very much DTO for your reply and the details in that reply, you`ve
been very helpful.

I had already ordered some "pattern part" rollers before my post as I knew
my old rollers were 15 x 12 - 12g. I was just curious what difference the
weight made.

Thanks again.


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 Post subject: Re: Yamaha Aerox variator rollers
 Post Posted: Sun Aug 08, 2010 10:29 pm 
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Joined: Sun Dec 14, 2008 4:23 pm
Posts: 8
I have eventually got around to carrying out this repair.

I purchased the rollers and had accquired a "nearly new" second hand belt off
another Aerox engine (still had Yamaha and belt size in clear writing and looked
virtually brand new) . I fitted the new rollers ( the old rollers were not that bad
with no real signs of flat spots, they and the belt could have been changed
shortly before I purchased the ped for all I know???) but elected not to change the
belt because this was no worse than the "nearly new " second hand belt I had
accquired and it semmed pointless changing like for like!

However, after trying the ped up the road, the same fault remains. Still at very low
speed it feels like the cogs are not engaging properly in the back wheel.

Should I reconsider changing the belt or is there another diagnosis?

Many thanks


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 Post subject: Re: Yamaha Aerox variator rollers
 Post Posted: Sun Aug 08, 2010 11:14 pm 
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Joined: Mon Dec 10, 2007 9:23 pm
Posts: 158
did you not check the clutch at same time ?

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 Post subject: Re: Yamaha Aerox variator rollers
 Post Posted: Mon Aug 09, 2010 10:58 am 
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Joined: Sun Dec 14, 2008 4:23 pm
Posts: 8
I only gave the clutch a visual inspection apart from squeezing it together to
release the belt.

Is there anything I should have done? I`ve never dismantled a clutch, are there
any parts that need renewing?

Thanks very much for your interest and reply.


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 Post subject: Re: Yamaha Aerox variator rollers
 Post Posted: Sun Aug 29, 2010 9:50 pm 
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Joined: Sat Jun 06, 2009 11:44 pm
Posts: 33
undo the clutch and have a look at the shoes might be worn its an easy job you will need a holding strap or impact gun though


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