Deristricting Vespa variator

I read an item at WIKI, where a member ground down the brass collar of his variator. I was wondering before I grind mine down, if you gained enough pickup and speed,to your liking. Or if you went another direction. Thanks!

Re: Deristricting Vespa variator

It just allows the variator to close more, thus more top speed if you're engine can pull it.

Might need to change roller weights to be lighter

Re: Deristricting Vespa variator

Grind the brass off and drill 1/4" holes in the variator weights. Massive gains for free

Re: Deristricting Vespa variator

Don't ask how I found it, but I read an old thread on this subject from years past. Most of the talk was favorable, others ,beh. But I think their Vespas were stock. Mine is a little upgrade, 13:13 carb/ # 69 jet hi flow air filter, polini circuit pipe. I hope to get 35 -40 mph , just so I can get away from irritated drivers who don't think I have a right to ride. So no pain no gain! It's about 40* out going to do it.

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Re: Deristricting Vespa variator

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Well...somebody beat me to it! Pics below...so I guess I’ll check to see if they drilled out the weights.ground down to 3mm & added 2 thin shins.

Re: Deristricting Vespa variator

kevin Smellaflange /

more low end torque would be nice at stop lights ...

to get out of the way of cage drivers in the rear veiw...

they don't like my quote on my back...

..I MAY BE SLOW, BUT I'M AHEAD OF YOU!

Re: Deristricting Vespa variator....

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Okay, I read it correctly, looked at it wrong. It wasn’t ground as I thought. ( newbie ) . So I ground it down . The washers I put back on, during my first run, I got really high rpms , no speed. Eventually I was barely moving. Got back put on a new belt. No high rpms , but good take off, slow speed. So as I don’t have a reliable drill press, I couldn’t open up the weights with the1/4” bit. So hopefully I can find a shop that will do it, and hope the lighter weights will bring my speed back up.

Re: Deristricting Vespa variator....

If you're having high rpm and no speed, lighter weights won't help. Did you deburr the inside after you ground it down? You'll want to ensure it still slides. If it does, the you'll actually need heavier weights to make it variate again. But that makes less sense than there being another reason you're not variating.

Also, what are the washers for?

Re: Deristricting Vespa variator....

Yes. Used 200 grit sandpaper, also buffed it 00 steel wool. The washers were there when I took it apart Ike. Not now. Also the rpms are normal but no speed after I put on a new belt.like I've read, variating is more of an art than science. Back to the drawing board. I'll check to see if it's sliding,I just assumed it would.Thanks for the help Ike.

Re: Deristricting Vespa variator

What kind of belt did you put on? Should be malossi or ax. Did you adjust for tension?

Re: Deristricting Vespa variator

Dirty30 Dillon /

You can sand the bushing flush with the variator cheek. Other than that, you should have been able to put it back on directly and feel a gain. You basically just made a 30mph variator.

Re: Deristricting Vespa variator

Yeah that's what I thought Dillon. As to Ikes question I put on a new Gates tri-power AX39 belt. I'm scratchin' my noggin, will try again tomorrow. BTW ,Dillon I was told to drill out my weights. Do I need to use a drill press?

Re: Deristricting Vespa variator

Les, you should be able to drill the weights with a hand drill, if you can hold onto em. Don't use pliers or vise grips and marr them up. But the drill bit should follow the center of the existing hole, like a pilot hole.

Re: Deristricting Vespa variator

Dirty30 Dillon /

> Les B. Wrote:

> -------------------------------------------------------

> Yeah that's what I thought Dillon. As to Ikes question I put on a new

> Gates tri-power AX39 belt. I'm scratchin' my noggin, will try again

> tomorrow. BTW ,Dillon I was told to drill out my weights. Do I need to

> use a drill press?

I would highly suggest that if you're going to go that route to use a press so you can drill them on center and they don't blow through one side.

Barring that, I have had really great luck with the malossi variator for vespa, or even grab some of these to go lighter.

https://www.treatland.tv/vespa-piaggio-14mm-x-14mm-weights-pick-a-weight-p/vespa-14x14-weights.htm

Re: Deristricting Vespa variator

Yeah... me and hand drills have a bad history of misery..Any special type drill bit Seth?

Re: Deristricting Vespa variator

A standard bit is fine, but if you're uneasy with it, just find & use a drill press. You could use a hand drill, and a vise to hold em if you're steady, but you need to remove material evenly and centered.

Re: Deristricting Vespa variator....

I use a drill press for mine, but you could use a drill. I also use vice grips. As far as marring them, remember you have plastic caps to go over them, so it shouldn't be a big deal. Alternatively, I use a bit of old tire tube to wrap around the weight and then clamp with vise grips.

I've ground the collars on several bikes and I don't notice a very large change. Lightening the weights helps a lot with acceleration, however.

I tell you what though, nothing beats a Polini. I'd get that before a kit any day. It just changes your whole world.

Malossi is good, but Polini is better.

Re: Deristricting Vespa variator

Vice and hand drill. The metal is not that hard so its not too crazy

Re: Deristricting Vespa variator

Ok guys, I got a case of CRS but found my drill press in the basement! 1/4" drill bit as suggested..worked out good. Before I put it together I made sure the collar moved freely as instructed,it does. Checked the belt tension, it's good. Gonna warm up with a cup of Joe, start it on the stand to see if belt rides up/ down. Then take it for a spin. Hoping for better run.

Re: Deristricting Vespa variator

Be careful revving it on the stand! Vespa transmissions like to come unglued when you do, so I've heard.

Re: Deristricting Vespa variator

It’s not the transmission it’s the cast steel clutch bell that explodes.

Re: Deristricting Vespa variator

> - Joe - Wrote:

> -------------------------------------------------------

> It’s not the transmission it’s the cast steel clutch bell that explodes.

Copy that. I was unsure what, but I was warned against it on mine.

Re: Deristricting Vespa variator

yeah pretty much just on kitted bikes turning high rpm though, i doubt a stock or mild kit bike would be able to rev that high

Re: Deristricting Vespa variator

Success! Did a lot better this time combination drill out weights and new belt didit ! Better take off this time and climbs better. I was able to squeeze 35mph on the flat. But I forgot a plug chop, so my throttle was getting slow response after warm up, I hope that's what it was. Pulled the plug and checked it with manual. Running rich.black . And oily at the bottom.Gonna WIKI it. Any ideas?(edited)

Re: Deristricting Vespa variator

Sounds like yer plug is about fouled out. Put in a new one and Maybe down jet from 69 to 67 and then plug chop. See what that gives ya.

Re: Deristricting Vespa variator

67 seems crazy huge on a stock cylinder, seems pretty big even for a kit, i am at a 60 right now and probably need to go to a 56 or 58 on stock /ported proma circuit

Re: Deristricting Vespa variator

Pretty sure I ended up at a 69 in mine too, iirc. At least that's what I wrote down in my book. Unless I read the stamped # wrong. Stock cylinder, 13.13 carb, and Proma circuit. Not that I'm correct, but it seems about right.(edited)

Re: Deristricting Vespa variator

It was Seth, I copied your post from awhile back and used it for the Bravo. Lowest in my kit is # 60 . So ill start from there. I am gonna order a set of weights. If I practice on the stock parts, ill feel better about spending 90.00 bucks on a polini in the future.Thanks for all your help guys,living the dream here! 8)

Re: Deristricting Vespa variator

Yep. I'm a #69. Went thru my notes. I also looked at the tuning spreadsheet in the wiki, and according to other Vespas, mid/upper 60's is where we should be.

Or maybe we're all fucked up.

Re: Deristricting Vespa variator

When I jet stock bikes, I have them 58-62. I'm glad to see you guys are in the same area.

I'm running 1 50cc DR kit, and it is jetted at 67. Still 50cc, but those boost ports open it up a lot.

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