Skip to content

When stock is not enough

June 25, 2011

I’m not ashamed to admit I’m completely satisfied with the GTS’ performance. I feel no need to tweak around with the engine, or to add a performance pipe (which to me makes a modern Vespa sound like a DR Chipper-Shredder®). At the other end of this spectrum are the folks who have the performance parts ordered even before taking delivery of a new scooter. Owners of 4-stroke Stellas who fall into that latter category will surely be giddy at the latest offerings from Scooterworks.

Their most recent weekly e-mail included these tasty items:

Pinasco pipe for Stella 4-stroke

Scooterworks photos

Someone had a Pinasco Stella 4-stroke Performance Exhaust on their 4-stroke Stella at Amerivespa. (I know this because I saw a picture… I wasn’t there, remember? 😦 )

Now that 4-stroke Stellas are in the U.S. in significant numbers, and since the word on the street regarding a possible Stella 200i is “don’t hold your breath,” one of these will be the only option for those desiring more oomph.

Like all other performance pipes for internal combustion engines, this one is less restrictive than the stock exhaust. Like a human (or, I suppose, animal) athlete, better performance is achieved if breathing can be improved. A pipe like this aids in evacuation of exhaust gases. And it makes your Stella sound really cool, too.

Pinasco carburetor for Stella 4-stroke

A less-restrictive exhaust also means the engine can ingest a larger quantity of fuel and air. If you only installed the pipe, you’d need to upsize the carburetor main jet to keep the engine from running too lean (and therefore, too hot, an important consideration with an air-cooled engine).

To achieve the full effect, Scooterworks and Pinasco recommend replacing the stock Keihin PB carb with Pinasco’s carburetor upgrade kit, which includes a 21mm Dell’orto carburetor and all the necessary bits and pieces, including three different-size main jets. A power increase of up to 20% is possible, sez Scooterworks, though you will initially need to try the different jets (and maybe some others) to achieve the optimum chocolately-brown spark plug.

The pipe sells for $499.99, while the carb kit costs $257.99. Plus S&H and sales tax where applicable.

If you’ve done this upgrade, or plan to, please let us all know how it turns out! Favicon

(DISCLAIMER: I received no compensation whatsoever from either Scooterworks or Pinasco for writing this article. It appears here because I consider it newsworthy, and of interest to owners and riders of Genuine Stella 4-stroke scooters. Thank you.)

  1. June 25, 2011 7:34 pm

    As you already know, Orin, I may be about to undertake a severe modification project. It’s one of necessity (the engine on the Ruckus is blown… poor guy ran it without oil, which didn’t take long to figure out). However, even with the fact that I have a mechanic chomping at the bit to help with the work for basically nothing, just to do it, I can’t help but feel like this one may exceed my grasp.

    I may end up selling or trading it, just to have something simpler in my life.

  2. June 25, 2011 7:52 pm

    What could be simpler than a Ruckus?

  3. June 25, 2011 9:22 pm

    Why the Stella 200 won’t come to the US has to be a giant question mark. I never did understand why it always had to be the 150cc. My P200 Vespa did better than 60 mile sper hour stock.

  4. June 25, 2011 9:47 pm

    Well, consider that it is smarter to install a GY6 150cc in the thing than to rebuild the painfully-slow stock 50cc. Also consider that the bolt-on mounts that are of any kind of quality approach $500, and we haven’t even bought the engine, bigger rear wheel, wiring harness, tire and exhaust yet.

    Granted, not a lot of Tupperware to remove, so the process is quick, if you have all the parts in-hand. But this is looking a lot less attractive to me after hearing about the “gangsta lean” one can end up with if one selects the wrong (presumably cheaper) mount.

  5. June 27, 2011 7:30 pm

    conch, I think it might have to do with the LML NV/Star only being available in 125 & 150cc versions back in 2003 when Genuine first made the Stella available. And now, they need to sell the 4-stroke 150s that have accumulated in dealer inventories. So no Stella 200i. Which I think is a shame, but ultimately for me a totally moot point, given my current impoverished state…

Comments are closed.