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Changing your scooter roller weights: The technical breakdown May 5, By lowering the weight of the rollers that you are using it allows the scooter to hold onto a lower gear longer think about a car where you don't change gear till later to get a little more power. By using lighter rollers you are allowing the engine to rev a little higher than with heavier rollers and helping it to hit a higher rev band before it 'changes gear' it doesn't actually change gear but you'll see what I mean.
Having heavier rollers make the scooter change up a gear too soon, again using the car analogy, it's a bit like driving along in second gear then changing to third gear way too soon, the engine doesn't have enough cadence to keep the gearing good! Lighter rollers may be needed in situations where the stock exhaust has been replaced by a performance exhaust as the freer flowing exhaust breathes better and takes the usable power band higher up the rev range, using lighter rollers allows the engine to rev up easier to reach that power range more effectively.
Also for a similar reason, a heavier rider may benefit from slightly lighter rollers to allow the scoot to stay in a 'lower gear' for a touch longer.
Don't be tempted to go too light though It can be very much a trade off between acceleration and max speed.. An alternative to changing variator rollers is to swap them out for Dr Pulley "Sliders". These are specially shaped sliding versions of the variator roller, they are manufactured from low friction materials to allow them to slide as opposed to roll variator rollers don't actually roll as you would imagine but more shuffle, slide and skip along inside the variator ramps making them on some occasions quite inefficient.
The shape of the sliders change the dynamic of the variator to allow it to hold onto high gearing hence top speed better. If you are thinking about getting a new variator, consider this.. What it will do is give you a more steady acceleration. If when you approach a small hill the scooter slows drastically you may have too light a contra spring.
The contra spring helps push the rear pulley back together when torque is applied to the rear pulley. In addition, slowing down from speed and then struggling to accelerate up again also indicates too light a spring because when you slow down the spring is supposed to push the rear pulley together into a lower gear ratio.
If you go with a heavier contra spring, you may need to go to a slightly higher roller weight. Likewise, if you go to a lower spring, you may need to go to a lighter weight. Replacements can be made of this part of the rear pulley with a performance part that has differently angles grooves.
The initial 'take-off' of your scooter is mainly controlled by the clutch-springs, these are 3 small springs that allow the clutch to bite.. By replacing these springs with performance ones you can make the clutch grab at higher revs hence allowing the take-off to be more 'snappy'.
The downside of this is that in heavy traffic the revving up of the engine to get the clutch to engage can be tiresome. Some smaller CC scooters may be restricted by placing a washer in-between the faces of the front pulley half and the variator, this stops the belt from reaching the outermost position on the front pulley hence not allowing the scooter to hit 'top-gear'.
It is a fairly simple task to remove the washer to de-restrict the CVT. Please be aware that on front pulley units with an aluminum outer pulley, the thin washer fixed between the bushing and pulley plate must not be removed.
Taking the thin washer out erroneously thinking it is the restrictor washer may cause damage to the front pulley unit. This is the restriction washer that may need to removed on smaller CC scoots. All Content Copyright by Modern Vespa. All Rights Reserved. Front Pulley also known as the driving pulley This is the collection of parts which includes the variator, outer front pulley half and rollers. Another photo of a CVT with the Outer Fixed Pulley removed showing the movable pulley face of the Variator Assembly on the left and the Clutch bell removed from the Rear Pulley Assembly showing the clutch mechanism on the right Outer Front Pulley Half also known as fixed pulley half, or static pulley This has been a very general overview but should be enough for you to setup your scooter at home without the need for a dyno.
I am setting up a piaggio Typhoon with a big bore and i was thinking of putting 2 Has anyone done a setting like this? Oh ,i am also running a malossi gears. Messages: Rides: Aprilia Sr Here endeth the lesson. Gilly , Jun 12, ErduanB , Sep 14, You must log in or sign up to reply here. Show Ignored Content. Share This Page Tweet. Your name or email address: Do you already have an account? No, create an account now. Yes, my password is: Forgot your password?
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