Epic Vespa Thread

I miss the "shed" thread. I was checking MA every day for new updates. I'm sad it's currently not being updated.

My favorite thing was all the wild stuff he did. I enjoy that unrestrained creativity.

I'm nothing special, and not as skilled as a lot of people, but I am going to see if I can make an epic thread of all the Vespa or related stuff I do or have done. It may not all be highly technical, but I find even simple projects amusing.

The goal here is to include as many pictures as possible. If you do Vespa stuff and want to share, go for it! Pictures please.

Easy one for first.

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Had stripped out top plate so I drilled it out and tapped it for bigger bolts.

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Who needs a malossi high flow airbox when you can open up a stock one and fill it with foam?

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And that one time when I was going to use two pancakes to make a street fighter headlight.

Re: Epic Vespa Thread

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Removed the emulsion tube so I can drill out a 12.10 carb into a 13mm.

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The difference is significant.

A couple of notes about upgrading Vespa carbs. First, if you have a 12.12 carb, and you buy a 13.13, you didn't upgrade. The intake is 12mm anyway.

Also, 13mm drill bits aren't cheap. So I use a 1/2". It's 12.7mm which is close enough for me.

Re: Epic Vespa Thread

I don't weld. It's on my list of future skills. Until then, I borrow help from Ed's Moped Shop. Didn't want to take credit for the next few photos.

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Chopped up my Proma to make it fit on my Big Red Bravo (BRB). This happened just today so it's still in progress.

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Re: Epic Vespa Thread

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Re: Epic Vespa Thread

I love the look of circuits when they are mounted like that, but I always think someones gonna get a toasted leg. Did the twin headlight make it on?

Re: Epic Vespa Thread

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Here's the needle valve setup I invented. It's a valve from an RC airplane engine. I can tune my mix on-the-fly. I had some help figuring it out from MA members.

I recently upgraded the BRB to a 65cc Malossi kit, and I wondered if the needle valve would be big enough to work with the kit, but it still works like a boss.

Re: Epic Vespa Thread

> Ryan Graeme Wrote:

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

> I love the look of circuits when they are mounted like that, but I

> always think someones gonna get a toasted leg. Did the twin headlight

> make it on?

Unfortunately no. I ended up giving away one of the buckets before I got it installed on anything.

Re: Epic Vespa Thread

What's the deal with the needle valve thingy? Likea homemade dialajet? Seems like a seizing risk to me.....luckily it's your bike so I don't care! :) Good luck with it lol

Re: Epic Vespa Thread

I’ve been messing around with this grande. Trying out the hybrid single speed trans with the scooter shaft. I flipped the clutch shoes so they are oriented for cw rotation, and also added a brace to the posts. The sub frame was stretched a little over 2” to run the Honda wallaroo belt. Im also using the ktm mini rotor cdi on this bike.

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Re: Epic Vespa Thread

Dirty30 Dillon /

I've been building this thing for way too long.

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Sacre Cases, Athena 47.6mm for MH, Polini Variator for MH, MVT Mini Rotor for MH, Athena Reeds for Piaggio Pentagonal --- > Minarelli stock rear sheaves with Polini Hardened Bell and Polini Evolution 3 Clutch, Hybrid Shaft.

Re: Epic Vespa Thread

There's still something missing.

Re: Epic Vespa Thread

> Aaron Blair Wrote:

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

> What's the deal with the needle valve thingy? Likea homemade dialajet?

> Seems like a seizing risk to me.....luckily it's your bike so I don't

> care! :) Good luck with it lol

Actually, I've been running it successfully for like 5 years now. It works exactly like it should. I did have a couple of soft seizes on the 50cc because I ran it without a temp guage and I didn't know how to tune. But that same would have happened with regular jets.

@ - joe-

Woah! Extended subframe! I actually am working on a custom subframe project. Hoping to open it up a bit and make engine and carb more accessible.

The rest of your stuff looks amazing too! Does the longer belt give you more variator travel or what? How do you deal with belt vibration?

@Dirty30

Looks awesome! Finish it!

@Bas

Lol thanks!

OK, don't want to post without Pic so here goes.

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Ahhh those Vespa box covers. The boxes would be so handy. If only covers were available. If only they weren't so flimsy. If only 3D printers were big enough.

Well, I have a friend who is cnc routering pine covers for me. I still have to clean them up, cut a hole, and then finish them with stain or paint.

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Replacement knobs are m6 and available on Amazon!

Re: Epic Vespa Thread

>

> The rest of your stuff looks amazing too! Does the longer belt give you

> more variator travel or what? How do you deal with belt vibration?

>

The wallaroo belt is wider as well as longer. I’m using it to get the belt to the top of the rear pulley. The transmission I did the scooter shaft swap on is 6.5:1 ratio I’m hoping it’s not too high of a gear set. I’m running a ported polini 46mm hopefully that will have enough power to turn them. The belt is about the same length as the si, I don’t think I’ll get excess vibration.

To keep with the picture with a post trend.

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Re: Epic Vespa Thread

Dirty30 Dillon /

I haven't even really begun to hunt belts for my setup yet, but I don't foresee a massive issue just doing some trial and error.

@Joe, I have the SS to Variated adapter shaft and I have been kind of thinking the same thing, in regards to have enough pull to overcome. That said, I also have a set of 108mm pulley cheeks.

I;m surprised you went through the trouble of extending a stock sub, instead of just swapping for a Si or grabbing an aftermarket option.

I'm also in the midst of 4 (?) other vespa motor builds at the moment? (Full Malossi RV Case With DEPS and Malossi CDI/ Stock Case with Pinasco 46mm and Kinetic CDI/ Stock Case with Athena 46 and Vespa CDI/ Stock Kickstart Case with DR and Vespa CDI) (edited)

Re: Epic Vespa Thread

Yeah I’m hoping the larger dia pulley helps with the higher gearing. I’m building this grande out of extra parts I’ve had laying around that why I just modded the stock sub frame. I have been collecting parts for a athena scooter cylinder Vespa build, that’s my next project.

Here’s a comparison shot between the scooter cheek vs a 90mm Vespa cheek.

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Re: Epic Vespa Thread

I’m hoping to end up with a bike like this when I get my scooter cylinder bike built.

Re: Epic Vespa Thread

ciao scoot (edited)

Re: Epic Vespa Thread

Dirty30 Dillon /

> - Joe - Wrote:

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

> I’m hoping to end up with a bike like this when I get my scooter

> cylinder bike built.

I don't think that I am looking for that aggressive an output. Although this bike I am building will most likely be a track/course on;y bike

Re: Epic Vespa Thread

Since I can’t seem to find side box covers, I’m thinking of replacing the boxes with old school lunch boxes. The metal type with hinged lid. You remember them, because you had a Strawberry Shortcake lunch box.

Re: Epic Vespa Thread

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Is grinding this off everyone's first Vespa upgrade?

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Fun fact: a tiny bit of grinding and some tapping with a hammer will make a quarter fit into a Grande top nut! If you don't have that amazing logo piece, fill that hole with a quarter from your home state. Made this one for a friend from Kansas.

Re: Epic Vespa Thread

> Seth B Wrote:

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

> Since I can’t seem to find side box covers, I’m thinking of replacing

> the boxes with old school lunch boxes. The metal type with hinged lid.

> You remember them, because you had a Strawberry Shortcake lunch box.

Pics ASAP.

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This is why these boxes are the best. Hide all your electrics, and keep everything streamlined.

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Upgraded to a 65cc Malossi kit on the BRB and first run was fine until it started backfiring. Fun lesson: if your ignition wire is rubbing on the flywheel, it'll ground out and cause backfires..... If it runs at all.

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I paint my engines.

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Black is my favorite thus far. It looks the best when finished.

Now just so you know, I'm not using any old paint. I use the ceramic-infused high-temp engine block paint. It doesn't trap heat, and supposedly helps to dissipate heat, actually. What I know for sure is that it does not make my engines run hot and seize. None of my painted engines have ever seized.

Re: Epic Vespa Thread

Kevin Bishop /

The KTM mini rotor is the same taper?

Re: Epic Vespa Thread

I built a hard to start Vespa it became a coat rack for a while.

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Re: Epic Vespa Thread

> Kevin Bishop Wrote:

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

> The KTM mini rotor is the same taper?

No it’s smaller I recut the taper on my lathe.

Re: Epic Vespa Thread

I came across a few of the ktm cdi threads searching older threads, I figured I’d try it for how cheap you can get the ktm parts. The downside is no fan, and no lights. But I’m water cooling this bike and I’ll run a drill battery on leds for the lights.

https://www.mopedarmy.com/forums/read.php?7,3148527 (edited)

Re: Epic Vespa Thread

I think Grandes are some of the most beautiful bikes. Here are three that I have revived.

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This was the unfortunate day my brother in law crashed the gray one (its his) and ruined his knee. Had to have surgery, but the bike was fine. He crashed at literally 10 mph.

I'm hoping to get him back on the bike as soon as it warms up.

Re: Epic Vespa Thread

OK, so I thought I'd show a bit more of how I made the needle valve.

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Mopeds use jets. Motorcycles use jets. Scooters use jets. But why? I think it is weird. Carbureted cars use needle valves. So do radio control cars, and airplanes. In fact, an .049 gas RC airplane engine uses a needle valve to adjust the mix. That engine has a piston the size of the tip of your pinky, but it uses a needle valve. Why? the ability to tune in a proper air/fuel mix is useful and desirable. So that's why I invented one.

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I figured I would try a method used in some engines where the fuel is added directly the air flow. This nipple was how I would do that without ruining my carburetor.

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Adding a nipple to the float bowl was easy.

Re: Epic Vespa Thread

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The rubber o-ring was necessary to seal it up. I also blocked the jet so no fuel could pass through the emulsion tube.

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This crazy contraption was what resulted.

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And so was this puddle.

Obviously this design failed. The engine ran, weirdly enough, but I had basically no useable control over the mixture, and the engine ran poorly.

Back to the drawing board.

Re: Epic Vespa Thread

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This time, I drilled out a jet.

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Then I soldered in a brass tube.

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