Motobecane 99z variator test

This is a short video of one of two variators tests I performed with my otherwise stock Motobecane 99z moped. This video shows the final set up of my variator. It uses the original movable pulley from Motobecane but with rolls instead of balls. It uses six rolls of 5.0grams each. Six rolls are possible because of a custom made professional 3D printed variator cage which can hold 6 rolls instead of the normal 3 rolls.
The moped is an ongoing restoration project. This is not the final product.

[@DavidFixesHisShit]

I love the sound when you kick in the throttle! So throaty!!

[@FrankyieFrank]

Hi David. There is no damper on the intake of this engine. This original. That makes it sound so rough. It used to be loud as hell! For some reason the intake sound is becoming more silent as the tuning of of the engine gets better. In the beginning there where a lot of tuning issues. I used to scare the crap out of people in the city. That was really bad. I am glad that's over. It is still loud though. No longer so loud that my ears are getting damaged. This moped has a horn. I don't know why. I never have to use it. It is a pity that you cannot see me operate the throttle. This engine easily runs 40km/h at 1/4 throttle which is ridiculous when the top speed is only 55km/h at max. This moped is weird!

[@davidbroutin3216]

the queen of 99 z therese

[@mobylettemaroc7212]

Belle mélodie

[@Zakaria_gamer_12]

I have one of this in Tunisia

[@FrankyieFrank]

Thats cool. I did not know they where sold anywhere else besides France.

[@TheFiatman2]

We have a 99Z engine in our ERAD capucine, top speed 45kmh with two people and €200 worth of shopping.

[@FrankyieFrank]

Thats fun! Probably with a stronger engine than my 99z. EV50 cilinder I would image.

[@barrycarleton4326]

@@FrankyieFrank Is the same engine as yours, I just rebuilt it with new rings and gaskets ect. Completely standard except I did a little gas flowing and joint matching for flow. I have always tuned two stroke engines for a hobby:)

[@FrankyieFrank]

@@barrycarleton4326 Well, if you got the same engine as mine, it would not drive 45km/h with 2 people in a miniature car. My moped is not much quicker than that and that is a moped with 1 person. ;-) These engines are not that powerfull. Which is obvious in this video. Acceleration is not that quick. I bet you that you have the quicker cilinder on there. I think that was the stock cilinder for this engine when placed inside a miniature car. But I could be wrong. I do not own such a vehicle.

[@barrycarleton4326]

@@FrankyieFrank I also rebuilt the clutch with new pads which are different to the others as they run opposite dierction, And I use a belt off a Vespa scooter, that made the most difference. I us an expansion chamber on the exhaust and a long 20mm exhaust pipe. I have a few vids of the engine running and test in the car.

[@barrycarleton4326]

@@FrankyieFrank the engine on the 99Z has a controversal compression piston which was described by some as a supercharger. The top revs are down a bit compared with a standard engine but it gives more torque. The hp is slightly raised too. It seems silly talking about power and torque on such a small engine but they have very slight edge over driving slow or not :) Barry

[@jacklehobofurtif4414]

...Peut etre un peu trop riche .....???........faudrait voir la couleur de la bougie apres une dizaine de kilométres .

[@FrankyieFrank]

Il est intéressant que vous puissiez entendre que c'est trop riche. En réalité, ce n’est pas le cas. La bougie d'allumage a l'air très bien.

[@jacklehobofurtif4414]

@@FrankyieFrank Difficile à diagnostiquer à distance ....... La bougie est rouge brique. En roulant plein gaz......ou juste avec un quart des gaz . ??