Modern Vespa

Has anyone come across this before or can offer a suggestion where to look for the problem??
Seems an oddball problem as it's usually the the seat failing and the scooter not revving

Do you mean it will rev right up (and unlock the tilt-lock) with no weight on the seat? If so, did it work as it is meant to before?

No it will rev on the stand and obviously the CVT engages.
If I take it off the stand and rev it it moves forward and the tilt lock disengages so it only disengages if the front wheels are moving.
For obvious safety reasons I've been sitting on the seat while doing this.
The seat switch is working in the correct range after checking with a meter as my first thought was that it had failed in the on position.
I've been having problems with the tilt motor and have now fitted a replacement and also wheel sensors/hydraulic pressure switch.
I've no real problem as I've had plenty of auto scooters in the past that didn't have this feature but I'm just a bit puzzled why it is doing this when it shouldn't??

Is this with the tilt-lock engaged or disengaged? It'll rev just fine on the stand with the tilt-lock disengaged. This sounds normal - I assume your tilt-lock disengages as soon as the revs go above 2,000. The front wheel rotation should have nothing to do with this behaviour. I'm still puzzled as to exactly what behaviour you're referring to.

Ohmmeter readings aside, does the dashboard seat sensor light illuminate and extinguish when you are and are not sitting on the seat?

Front wheel rotation will unlock the tilt even with revs below 2000 but you must be going at least 6.2 mph as I demonstrate in this video.

So front wheel rotation in your situation has no bearing since you are probably hitting 2000 rpms as Jim said well before 6.2 mph.

Hmmm now I am not sure if what I just posted pertains. OK so you are on the stand with the tilt lock engaged and not sitting on the seat. Does the engine rev or bog down?

OK forget the tilt lock side of things it revs whether I am on the seat or not.
No red warning light.

That is normal then. If you are on the center stand with the tilt lock disengaged it should rev.

If you are on the center stand with tilt lock engaged then it should not rev.

What has the stand got to do with it I can't see any switch??
It's a 2007 250??
As far as I am aware it shouldn't rev if there is no weight on the seat??

You don't know where the tilt lock switch is?

That is true with the tilt lock switch engaged. If the tilt lock switch is not engaged then it will rev in any case.

I meant a switch(cut out) on the stand that's why I asked what the stand had to do with it.
So you are saying the seat switch is not operative if the tilt lock isn't engaged??
I thought the seat switch operated in all conditions ??
It's evening here so I'll try it tomorrow.

You are correct there is no switch on the stand. I suggested putting it on the stand to raise the rear wheel so you could ascertain whether the tilt lock was working correctly without worry that the scooter will take off on you .
Yes. No.

Try putting it on the stand with the tilt lock engaged and not sitting on the seat. It should bog down if you give throttle.

Then try sitting on the seat and change no other condition. Wait a few seconds then give throttle. It should rev and the tilt lock should disengage.

Remember to relock the tilt lock before you take it off the stand.

Have a good evening.

OK will do. I hadn't made that connection as I've had lots of other problems with warning lights/faulty lock etc. which I hope I have now sorted??
If that is the answer to the revs I'll be happy.
thanks

Hope it works as it is supposed to. I will do a video tonight of what I am talking about if I can get my air box sorted.

I haven't actually ridden this yet as I only bought it a few weeks ago(cheap) with the known problems and it's taken me a couple of weeks to figure these out.
I'm retired now but have had bikes/scooters for 50 yrs but these MP3's are something else when it comes to electronics/sensors etc.
You can see why they are expensive machines when new but I wish Piaggio had designed better access eg a few bolts and the whole rear lifts off etc.
All these screws and a certain order to remove panels makes every job quite labour intensive which increases dealer costs.
Added to that is the fact you can't see broken electronics
I managed to find the complete front end from a 2013 Yourban 300 at a very good price so have transferred most of the sensors/tilt motor over and, fingers crossed, it's looking good.

not sure if the parts from a yourban are the same as a mp3. did you double check part numbers?

Yeah but

>No red warning light.

Are you saying that regardless of whether or not you are sitting on the seat, you are not seeing an idiot light on the dash that changes when you stand up and sit down? Guys, on a /250 does that ONLY happen when tilt-lock is engaged - I am not home right now but I could swear that on my /500 the idiot light illuminates when I sit down/stand up irrespective of the tilt-lock status. Could be wrong though, never really paid close attention before. Just want to make sure that he doesn't have a bad seat sensor, with or without any other problems.

All the mechanical parts fitted with the exception of the tilt motor/gearbox but as my main problem was the electric motor I managed to make a good one from both units as the motor worm gear casting is different. I also had to split the cases as the shaft that drives the cable is a different length.
The wheel sensors are the same on all models but the Pot was different and had a different plug/socket but will physically fit.
I also fitted the pressure sensor.
As it is in an awkward spot I fitted the new park ECU although the old one appeared to be working.
The other body parts/subframe are completely different as is the radiator.
I gambled that the major mechanical parts would be the same as I couldn't see Piaggio changing expensive components for what is a styling exercise.
Anyway as soon as I turned on the ignition it acted completely differently and all lights/warnings went off and I was left with the yellow flashing tilt lock light which goes off as soon as you move.
I'll check it out again today particularly the sequence re the rev limiter/seat situation

All is well it works just as you said so I'm very happy after the work I have put in.
Thanks for the info Sticky

Excellent! And pretty damn good since you have never worked on one before. You should think about opening a shop maybe.

Well once you start investigating and doing some research the tilt lock system is not complicated. Where it gets complicated is the electronics. The rest is just a normal scooter with funny leading link type forks
I'm a Scot so I keep away from dealers where possible
I was in the Royal Navy and trained as an aircraft mechanic in the sixties and have had a lifelong interest in cars/bikes so my basic knowledge is sound.
I also have a Yamaha XVS650A trike
If I had an older mp3 long term I might be tempted to remove the system and save the weight but the electronics would be the problem.
I understand some people may prefer the tilt lock if the scooter is physically too big or heavy