Yamaha C3 close-up of the pulleys in action.

[swss12]

belts a little loose there bud

[moung06]

Hi everybody!

I gotta a yamaha Giggle 50 (european version)

So i removed the ring into the transmission, but i'm not satisfied of the max speed (50km/h) so, do you know if there is something else to modify or change to improve speed? (like CDI, exhaust etc)

[zaran1]

This is not enough to get higher speed on a Giggle.

The C3 (american ) and Giggle (european) have different variators. European models are more restricted than american models.

You must find a way to get a C3 variator on your Giggle. Changing the exhaust or cdi would be useless without a good variator.

Your Yamaha dealer may be able to get you a C3 variator, or else, search the web.

[zaran1]

I must warn you, though: It may be illegal to go over 50 km/h on a 50cc scooter in your country. Check your local laws befor you modify your scooter.

[nt04159]

this is called centrifugal force google it thank 4 uploading this mate

[Ucster]

Very educational.  Thanks.

[fdyjt]

LET ME ASK SOMETHING

WHAT IS HAPPING IF THE BELT DOESNT GO FULL UNDER THE POULIE?

because when i drive 86 i feel that my engine wants to do faster but it cant

i wanna know what the reason is

SOMEBOBY PLS HELP

[paraglidermx]

The front gets bigger(shaft the variator is on spins the same but belt spins faster because the pulley gets bigger)the back pulley gets smaller so the back wheel can spin faster,Pretty Cool!!!!

[greyhounds777]

Could this principle not be used for pedal bikes?

[paraglidermx]

Its the same principle for ten speed bikes,look at it!!

[IlikedYourVid]

Well, it's been done.

[BlenderFreak777]

Pooly lol, accents are awesome.

[PhilipHo92]

Nice! and thanks

[lewisbarker1993]

So if you put a weaker spring between the clutch and the rear pulley will you get improved acceleration?

[BlenderFreak777]

...i think that would depend on the size of the engine, if it cant deliver the power, you'll just be staying in a lower gear for too long, slowing yourself down...well to my understanding.

[secondgearinfo]

A weaker spring will mean poorer acceleration because of lower revs, no matter what engine size. It also reduces belt-friction on the rear pulley, so it may start to slip when torque is required.

When you tune the engine, most of the time a stronger spring is advised, because of better grip on the belt and more revs when accelerating.

[secondgearinfo]

...But if you keep the engine at stock set-up, it's probably better to place lighter weights in the front pulley instead of a stronger spring at the rear.

Placing a stronger spring also increases friction, which is only needed when you have lots of power/torque.

But remember, a bit more revs causes better acceleration in most cases, but it also means less economy.

[Kirzilla]

Hello, thank you for video explanation. It was always some kind of magic for me how variators are working. Now it's clear. Here, in Russia we also call variators - "centrifugal clutch".

Thank you!

[JRZRacing]

so what makes the front plates contract is the roller weights? Does the rear variator also rely on rollers or does it open as a result of the contracting front plates?

[zaran1]

Roller weights are pushed outwards by centrifugal force (or rotation force if you prefer), this makes the variator to contract, thus changing the ratio.

The rear pulley halves are spring loaded: the spring pushes the outer halve towards the inner halve. Thus, the movement of the rear pulley is just "following" the movement imposed by the variator (front pulley).

[JRZRacing]

Thanks for the reply! That's exactly what I wanted to know.

[specialks1953]

Very nice job of explaining.

[vagnusde67]

Very helpful. thanks

[morriswil32]

Very helpful. Thanks for the explanation