Modern Vespa

Hello,

After riding, maintaining and repairing motorcycles for over 30 years I have bought a MP3 400 LT scooter for a nice price with a not so nice problem

The roll lock system will not lock.
The orange light seems to function normally. It starts flashing when I bring the bike to a standstill and turns off again when I accelerate.

When I want to lock, the roll lock malfunction light comes on and it beeps for 5 seconds, then silentl for 1 second and that pattern repeats itself.

When I press unlock 2 or 3 times, everything is "normal" again, red light goes off, beeping stops.

When I press the lock button, I hear something clicking. Sounds like a relay or solenoid valve.

What could be the cause of this problem?

I have checked the hydraulic fluid level. Judging by the color the fluid seems old, but the level is ok.

I tried a method I found on Youtube:

Remove the rubber cap on the end of the electric motor, insert a flat blade screwdriver en free a possibly stuck motor by turning it.

Additional to the inscruction on Youtube I did this with the battery disconnected, worrying the control unit might "freak out" if it detects sudden movement.

I did this without dismaounting anything, everything mounted on the scooter.

It is rock solid, I can not turn the screw (axis?) inside. Is this normal, is there any type of brake holding the motor? Or should it move freely?

Problem solved!
In the end it turned out to be in the gear box where the black electric motor is screwed on. On the bottom of this gear box there is a black plastic cap. If you remove this you can manually turn the system with a small flat screwdriver in the hole. Mine was stuck solid.

In the gear box there is a large gear with a number of damaged teeth. I have the idea that it only turns a quarter turn, so I turned the gear half a turn so that there are good teeth again at the worm gear on the shaft of the electric motor.
Everything cleaned and re-greased and now everything works fine again.

I am now starting to wonder what caused the damage to the gearwheel.
When engaging the tilt lock the last 0,5 second (approx.) I here the load on the engine increases. Maybe the stopposition is not correct?

How can I check if the stoppositon is correct?

Would you mind posting the YouTube link? I'd like to try on my 400 that has had this problem for over 1 year

https://www.youtube.com/watch?v=825iqly0Ah4

It is in French, but it it pretty clear what the procedure is. My french it just enough to order a croissant at the bakery during holidays, so I did not understand anything in the youtube video

Put it back in the position you started in. So count the number of turns so you can reverse it to it's original position.


If you have to disasemble it like I did,
First you have to umount the potentiometer on front of the gearbox.
The shaft of the gearbox for the potentiometer has a flat side. So I marked its position with pen on the gearbox. I also put some tape on the rotating part of the potentiometer to prevent it from turning while hanging loose. And also marked the position of the flat side of the hole for the axis to be sure.

After removing the potentiometer you see 3 allenbolts, these go trough the main gearbox to the rear and hold the electric motor and its little gearbox in place. When you loosen these 3 bolts you can remove the motor plus its gearbox and service it on the workbench.

If the electric motor is the problem, it is one unit with the gearbox an very expensive when you buy it from piaggio. https://www.easyparts.nl/Electric-Engine-Group-p33565813?mgp=0-4019-1-m420-m2091-m2468-m11540-s11542-d103979
It is a motor for whiperblades on cars. Piaggio buys them from a company called OSLV, their brand and partnumber is labeled on your motor.

I found and aftermarket whipermotor with a different gearbox for arpoxx. 10% of the price. You would have to switch the gearbox with you own. https://www.autodoc.nl/mapco/7932595. I selected this one. Wiring is also different and I am not sure if it has enough torque but I would have given it a try. Just for fun because I am a tech nerd . This was my plan B, but fortunately plan A was suffcient.

Plan C was buying it directly form OSLV They sell it at approx. half the price:
https://care.oslv.com/products/c9900463/3-87.html