MOPED ARMY

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

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.

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.

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

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

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.

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.

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.

Replacement knobs are m6 and available on Amazon!

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)

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

Is grinding this off everyone's first Vespa upgrade?

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.

I paint my engines.

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.

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

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)

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

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.

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.

Adding a nipple to the float bowl was easy.

This time, I drilled out a jet.

Then I soldered in a brass tube.