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dougl65

Help, help, help!

I don't think I understand what is required. What I have gleaned from the forums is that the Polini variator is better than the Malossi. I have been looking at the following on the PM tuning website - a Polini variator kit, a Polini race clutch and the Polini rollers and PM rollers.

A couple of questions.

Can I use the standard belt?

Should I bother changing the clutch (it's relatively cheap at £40 so I am ambivalent)?

What roller weight is the best compromise for off line acceleration and top speed? (Choice of Polini 13.2 14.7 15.7 or PM's own 11.0 11.5 12.0 13.5 15.5 )

Is the correct roller size for the Polini 20 X 17 ?

Sorry about all the questions but I would like to get this right first time! I do a mixture of city and fast dual carriageway commute! Any advice would be much appreciated. I am a REME trained mechanic in a former life and am reasonably competent and confident of doing all the work myself.

Finally, would any of this affect my warranty???? Shocked

Or should I let my dealer do the install to maintain the warranty. I have a good relationship with them I think!!

Maver · Posted: Sun Jul 29, 2007 12:28 am Post subject:

from what i have learned from the members on here just go with a polini variator, malossi "X" belt and 14g (ish) rollers for now, leave anything else until later (if needed at all) changing to much at once can leave you wondering what is doing the job and what isn't Wink

discuss warrenty issues with your dealer beforehand and weigh up the pros and cons if he says warrenty will be invalid........

if you do the work yourself, plenty of photos to aid correct reassembly Cool

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scar · troop Joined: 12 Jul 2007 Posts: 42 Location: manchester

first up i have a polini clutch fitted on my gts its great so fast off the line its untrue the difference in weight is unreal the polini is so much lighter
but on my findings its shifted the weight distribution you will need heavier weights,ive got a new standard belt and new standard 14g rollers (although the only other modification ive got is a pm pipe) ive lost 10mph off the top speed so too counter act this im going to put heavier rollers in im going too try the polini 14.7g, but im also going too get the 15.7g just incase aswell as i have a feeling im going to use 3 of each rollers,
one mod that some have done is put a bigger/wider back tyre on a 140/70/12 there is mixed results on this it works for some it doesnt for others,but as i needed a new back tyre anyway ive got a 140 going on some time this week,ill let you know the outcome and my veiws once its been on for a couple of days,
next on the list for me after getting the set up right is a polini variator it seems to me that all after market parts are a lot lighter in weight than standard parts so in the long run it can only help on less wear and tear
warranty work mines coming up for 2years old(oct)so it will be out of warranty then any way but as i understand you invalidate the warranty as soon as you put an aftermarket part/mod on but having said that the modifided part should be under warranty from the makers for a certain length of time if its been fitted right you should have no problems
ps sorry the reply is a bit long winded

dougl65 · Posted: Sun Jul 29, 2007 6:51 am Post subject:

scar · troop Joined: 12 Jul 2007 Posts: 42 Location: manchester

dougl65 · Posted: Sun Jul 29, 2007 5:56 pm Post subject:

Innocenti · Posted: Sun Jul 29, 2007 6:16 pm Post subject:

yep im running a mixture of polini weights to get to 14g intrested to see your findings am tempted to try the dr pulley weights in my polini variator Shocked

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smirnoff · Posted: Sun Jul 29, 2007 6:21 pm Post subject:

Don't mix the weights, the lighter ones wear quicker than the others. Malossi rollers fit too as do PMs own. 20 x 17
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dougl65 · Posted: Mon Jul 30, 2007 6:28 am Post subject:

I've just had a helpful reply on Modernvespa from facemechanic. I won't be mixing the weights though!

"ok couple things...

stock gts rollers 20.9X17X11.2

after market variators are made to be some what uniform... just about no scooter on the market other than the GTS take a 20.9X17 roller... so the aftermarket companies uniform the size, so rollers are readily available in mass quantities.... ie 20X17 witch fits in about 3257490736 performance variators for different scooter...

polini VS malossi...
the malossi multivar has not been(in my knowledge) redesigned for some time... the polini speed control(variator) is fairly new to the maxi scooter market and as such has some better engineering behind it... ie grease seals and channels... both come with a set of 11g weights and a set of 14g weights....

if you want acceleration 11g weights are slightly lighter than stock and such increase engine rpm faster... if you want higher top speed use the heavier weights to how the belt tighter and you'll have a lower rpm at higher speed...

if you want more all around usable power mix the 11g and the 14g...

kevlar VS stock rubber belt...
kevlar is tougherand as such holds the drive line longer... therefore silghtly higher topspeed... down side to kevlar is that on the low end they dont grip quite as well as the rubber belts do... so slipage my occure...

yes you can use a stock belt.

buy a polini race clutch and or speed clutch... worth every penny... they are not as "tune-able" as the malossi delta clutch, but if you not building a race bike and just want so bolt on speed, theyre perfect..."

MikeHolland · Posted: Mon Jul 30, 2007 9:26 am Post subject:

Thanks for publishing all this info, but what do Deltas clutches and speed clutches give you that stronger Malossi springs won't give you? You want to have the clutch take a little later to get up more revs for take-off, and then the clutch only has to do one thing - grip the drum tightly.

So what other advantages do these special clutches have? You adjust clutches either by setting screws or by swapping springs. Or is there a big difference in weight that helps acceleration, same as a lightened flywheel?

MIke
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russpeed · Posted: Tue Jul 31, 2007 9:36 am Post subject:

What wrong with the standard clutch then?
Race bikes use em, road bikes need not IMO.

Unless of course your a traffic light grand prix man! Very Happy

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smirnoff · Posted: Tue Jul 31, 2007 12:12 pm Post subject:

I've been scratching my head about that one too....how can the clutch make it faster other than initial take off?
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dougl65 · Posted: Tue Jul 31, 2007 7:20 pm Post subject:

Craig E · Posted: Tue Jul 31, 2007 8:13 pm Post subject:

i was thinking of doing this myself variator, belt and clutch but as pm tuning are 2 minutes up the road from me was going to get it setup on there dyno i'll see what people here are saying then i'll have a word with them and see what they recomend
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dougl65 · Posted: Tue Jul 31, 2007 9:00 pm Post subject: