Modern Vespa

Hi there I have been and gone through with the small up Grade on my PX Vespa l have put my drilled air filter on and up the main jet to a 98 !! and took her for a few miles today and I have noticed a good difference it's a lot more responsive though the gear's and on the get go no boging so far still on standard set up just without the cat part on the exhaust !! So I will give her a good run on Sunday morning 10+ miles and see what is what still got the sip road 2 in the box waiting for me to get down and put it on !! Not as young as l once was and getting to the ground is hard work for me !! Any tips on how to make life easier changing out a exhaust system much appreciated ✊

Lift table? Old electric hospital bed? A younger friend who is willing to get dirty?

A member here has a picture of himself working on his scooter while standing in a pool.

Thanks for that l will try and put it up on a jack or two and a axle jack might be enough hight needed

Seat the center stand on a 2x4 for some more height. Lift the tail and jack/block it with something stable. The key is to lift it only to the point where the center stand feet are still holding stable before the bike dances, somewhere soon after the front tire hits the ground.

Remove the rear wheel, or deflate it enough to fit the swingarm bolt.
Thread the bolt into the floating nut by finger. Be patient. It'll dance until you're lucky

Fully seat that bolt in the threads (don't torque it), then tap it up into the stub on the other side with a heavy hammer until the tone changes.
Torque that bastard to spec. 14-16 ft-lbs

Go back to the swingarm bolt and torque that bastard to spec. 30-35 ft-lbs
Best of luck!

Look nice one mate and that's the best bit of info l have had about setting up the exhaust system so far !! I only have one car Jack and one Axel Jack so using the stand method look good to me 🤟 soulboy74 ready for the English spring weather. Just wondering about setting l have a PX 2015 125 cc l have removed the cat part of the exhaust system and replacement manifold to the box and drilled out the air filter 5/8 mill's and up the main jet to a 98 and it's going a little bit better more responsive just wondering if this setup sounds good to go 👍 love to hear from you guys soulboy74

Yeah, but that only works in the Summer.

What was the original main jet size on that? As it was a euro 4 or 5 model it was set up for economy/low emissions.

Do you have any jets bigger than the 98?

One easy test is to find a junction/lights where you can pull away and accelerate wide open from 1st to 3rd. By the time you're well into 3rd gear, look for a marker, like a road sign. And take note of the Speedo reading. Keep upping the size of the main jet until it starts to go slower by the road sign. And put it back to the jet that goes fastest.

Yeah that picture is wicked love the fact you guys are so inventive USA will always give you a really good answer to any problems us Britt's have difficulty with 👍. Going to try the stand in place on two brick and axle Jack under the back mudguard approach !! Just wish I had a swimming pool in my yard !! Living the dream you lucky GI stay lucky 🌈 soulboy74

The way I remove and reinstall the exhaust is:
Remove both cowls
Remove battery and spare tyre, if so equipped
Fully loosen the exhaust clamp at the cylinder
Get a thick wood plank covered with a pillow or blanket and carefully lay the scooter on the right side flloorboard over the plank/blanket
Loosen all 5 nuts of the back wheel and remove the wheel for optimal clearance -you may have enough clearance to leave wheel on but slightly wiggle it as you do next step
Now you can fully remove the exhaust flange bolt and wiggle the exhaust off.

As far as drilled air filter, I was skeptical of this mod, but I did it, leaving the exhaust alone (not catalyzed in 1985), as well as the original jetting in its entirety. The result? Nice improvement in acceleration in all throttle positions, and at least 5 mph extra top speed.