Modern Vespa

Is there any audible or mechanical performance symptom that reflects a need for roller replacement on my MP3 400?

You'll get much better performance by replacing the rollers with Dr Pulley sliders. That's a given.


....

better improved MPGs, or just speed (less MPGs)?

The only mechanical reason to replace rollers is if the old ones are worn. If you go with lighter weights or Dr.Pulley sliders, or install a Fuzzy washer, it can mitigate an annoying shudder when accelerating at low speed
//and of course deviating from stock causes cancer Depends on the weight of replacement rollers, or if you get the dr.pulley sliders to replace them

you can get slower acceleration with possible higher top speed and probably better MPG with heavier rollers

you can get faster acceleration with a lower top speed and definitely lower MPG with lighter rollers

with sliders, you can get faster acceleration, about the same top end and better MPG (if you can keep that right hand under control).
--of course you can these parameters by deciding what change in weight is good for you.

Hi guys,

I'm brand new to the forums and I just purchased a 2009 MP3 400 yesterday. I am already in love with it and I'm really glad that I didn't buy the 2014 Triumph Speedmaster I was looking at.

While riding yesterday, I instantly noticed a shudder between 0 to 20 mph. I started searching for answers and found MV. I am very grateful for all of the info provided here by members. Based on said info, I have already ordered two sets of Dr Pulley sliders (15g & 16g) which should be here in a few days.

I have two questions for you guys:

1) Are the fuzzy washers still available for purchase somewhere?

2) Does anyone know where I can buy a set of quality foot pegs?

I am 6'1" and 230 lbs.and I noticed right away that I slide forward on the seat while riding. I have a 2013 Zuma 125 that I was able to find highway bars for, and they changed my life. It's now an absolute joy to ride. I am planning on riding my MP3 to work daily and it's 126 miles round trip. Having some pegs to strech my legs and also help me stay in position on the seat will make the difference between riding it everyday and leaving it in the garage.

Fuzzy washers are 1mm thick washers that go on the driving pulley; stock standard stuff. I have one or two if you like I can send it (I'll need to verify it is correct ID/OD for MP3 400 first).

Highway pegs, contact (PM) Old As Dirt. He's having some peg mounts made for the MP3 500, and may have suggestion for you about your scoot.

When I'm on the Dr Pulley website and search for my MP3 500 scooter, I'm given a list of 7 pulley weights to choose from. I'm having trouble knowing which sliders to purchase. Please help me select the correct sliding rollers for my 2009 Piaggio MP3-500. Thanks!

Welcome, Owlo.

A thread-title search for keyword "pulley" in the MP3 section turns up several relevant threads, including these:

Learning from mistakes - Dr Pulley weights
Dr Pulley 17g vs 19g in regards to Hwy driving and RPM's
dr pulley 19gr
Review: 21 Gram Dr. Pulley Sliders in an MP3 500
Review of Dr Pulley 17g install on 500

Enjoy your reading.