Modern Vespa

Am I missing something?

yes 13gr are much to light go for17

What's the best weight?

Std weights for the 400 are 19 gms after 09, 21g before. What do you want to achieve?

16 would be the lightest for a standard 09 or younger bike. 17 to be conservative. Maybe 16.5 as a compromise. But again you have to be clear what you wish to achieve.

Sorry I see you mentioned 17 now

Don't forget the best bit the fuzzy washer.

Better power off the line.

Where do I get one? What does it accomplish?

Fuzzy washer adds 1 mm space between the primary sheaves, which makes the belt ride lower, which lowers the "gearing" for faster takeoffs and generally peppier throttle response. Maybe decreases top speed by a couple MPH, but I don't ride at 90+ MPH very often myself.

Search "fuzzy washer" in the forums. You can get them as a standard sized thrust washer on line, or Fuzzy made a bunch on a CNC machine. I don't remember the exact diamater and hole- maybe 36mmx22mm 1mm thick?

It's a precision washer - the story behind it's interesting and goes waaaaaay back.
I had a bunch machined on CNC and I still have a few left.

Paypal $10 to jon@rezolutionphoto.com and send an email with a properly formatted mailing address. Fee includes fees and postage worldwide.

I put 17's in my 400 along with a 'Fuzzy' washer. The difference is pretty incredible (for a 500 lb., 400 cc scooter anyway). My 0-50 mph times went from an average of 10.25 seconds to an average of 8.8 seconds. That doesn't sound like much but is a very noticeable difference. Btw, I got my 'Fuzzy' washer from BubbaJon.

I paid you earlier this afternoon. Can you confirm?

A side effect of lowering the gearing slightly will be increased engine rpm before the clutch engages which will get you more into the power band. Then the lighter weights will keep the motor there.
You may experience increased rpm during cruising but that is just the ying and yang of the mods.

Bubbajon can you let me know if you received my payment and shipped?

I spoke to a very helpful man at this website. Does anyone have any experience with this site? He didn't have great things to say about the sliders. But recommended the Malossi 14 gram rollers. And feels like my shutter and squawking noise can be solved with a new Malossi Spring for the clutch. Any thoughts???

Scooter Parts is a good company.

Many of us here (including me) use the Dr. Pulley sliders. Their design is proven. I have heard people who have ran them for thousands of miles with no wear at all. The design/function of the sliders is superior to rollers in my opinion.

Also as I and others have previously told you, 14 grams is going to spin that motor like crazy. 16 is the absolute lowest I would go and I run 17's which perform great in all conditions. There are many threads on this forum that you can search to get more information.

14g rollers are way to light. I have Dr. Pulley sliders in mine and I really like them. Mine came with (I think) 25g rollers and I went with 21g sliders and it was a really nice improvement.

Keep in mind he is working on a 400, not a 500.

Correct 400...

Did you send it?

What tools will I need? Appreciate you guys!!!!

Torque wrenches for sure when you go to snug things back up. The inexpensive ones from Harbor Freight have worked great for how little I use them. A 3/8" should work fine for the smaller bolts but you'll need a 1/2" drive for the variator nut and clutch. Socket for the variator nut I think is a 27mm.

Thanks to everybody that's helping me. Can someone direct me to instructions that indicates exactly where to install the Fuzzy washer on the Variator. I believe it's just added to the center of the variator. But I'm just guessing based on what I think its supposed to do mechanically. Appreciate everybody.

Skip ahead to 1:51

Thanks Brent. So the larger black washer is stock and the fuzzy washer is stainless steel looking. Btw, didn't this guy install the last concave/convex washer backwards? I thought that was installed convex out.

It looks like he did to me. I installed the other way around because I'm sure that's what the manual says. If you haven't found the manual hop on Google and search because it has all of the instructions.

How did the install go for you? How did your MP3 respond to the changes?