Tech Tips for Lambretta and Vespa Scooters

Check the following items for tips on, well, whatever we are asked about and have time to list. (For general info, see the links page.)

I need technical help with a part I ordered

All tech info we have is on the product page or, if there is a diagram/installation help, it was noted in your original order email, so see that email please.

Recommended upgrades:

  1. Our Top 10 upgrades for your Lambretta.
  2. Our Top 10 upgrades for your Vespa.

General:

  1. Download official parts books and user manuals.
  2. Download a flowchart of faults to find the cause of a problem with your scooter. (Vespa, but mostly the same on a Lambretta.)
  3. How to break-in a new two-stroke motor
  4. How to lock your scooter so it isn't stolen
  5. What tools should I have for working on a Vespa?
  6. Where is my Lambretta or Vespa serial number located?

Models:

See what Lambretta or Vespa models are similar so you can order parts correctly

Websites:

  1. ScooterHelp.com
  2. Vespa Maintenance

Cable/controls:

  1. Adjust the cables and selector box on your Vespa when it is jumping out of gear. (Or change the cruciform if that's not it.)

Electrical:

  1. Lambretta/Vespa spark plug cross-reference chart
  2. What your spark plug should look like: here or here
  3. Should you use a resistor spark plug or not?
  4. How to test your scooter condenser is OK
  5. How to wire a Lambretta stator 12 volt conversion

Fuel/exhaust system:

  1. What is the best carburetor for a Lambretta?
  2. What is the best carburetor for a Vespa?
  3. Modern Keihin PWK/Mikuni carbs:
    1. How to tune Keihin/Mikuni carbs, including a PWK needle chart
    2. See the PWK jetting details others have used.
    3. Add your PWK jetting details to the infobase to help others.
    4. How to set a Keihin PWK-type carb float
    5. An exploded PWK diagram
    6. What the difference between roundslide, flatslide, and D-slide (PWK) carbs?
    7. PWK carbs versus Dell'Orto carbs. Who wins according to Scootering
  4. Adjust a Vespa Dell'Orto carb
  5. Official manual for Mikuni VM carbs
  6. How the weather affects carb tuning
  7. How to do a plug chop to check your jetting
  8. How to clean a rusty gas tank
I have one of your exhausts in the stainless version on my tuned Vespa, Malossi 210, cut crank, ported and polished, Cosa clutch, all running off the standard 24mm carb. These are the dyno results I obtained using your exhaust, maybe you will find them useful and can use them on your site, etc., to show the results you can get from one of these pipes as they are great value for money and perform very well and still give the motor lots of torque.

Dyno results with:

  1. ScootRS Lambretta tuned exhaust, Mugello 225, and 30mm PWK carb. (Low-scoring dyno.)
  2. ScootRS Lambretta tuned exhaust, 200cc, and PWK carb.
  3. ScootRS Lambretta tuned exhaust, Mugello 186 (v.1 only), and 28mm carb.
    (15hp on a low-scoring dyno. To compare, the same setup with a Clubman exhaust produced 12hp.)
  4. ScootRS Vespa 150 tuned exhaust and M-class/LML 5-port engine.
  5. ScootRS Vespa 200 tuned exhaust and Malossi 210 and torque (Malossi 210, cut crank, ported and polished, cosa clutch, standard 24 mm carb).
  6. ScootRS Vespa 150 tuned exhaust and LML engine, GickSpeed 166 (ported Malossi 166, 17 btdc, auto retard 2 degrees), Mazz race crank, 24/24G carb (BE3, 130 main). 16.6 HP, 30lbs torque.

Stickers/decals

Some videos to help you put on stickers. The same ideas apply to various types and models. If we can do it so easily, you can too!

  1. How to put race stripe panel stickers on your Vespa GTS/GTV/LX//LXV/ET.

  2. How to complete panel stickers on your Vespa GTS/GTV/LX//LXV/ET pt.1.

  3. How to complete panel stickers on your Vespa GTS/GTV/LX//LXV/ET pt.2.

Suspension:

  1. Lambretta R1 sport shock adjustment
  2. Lambretta front end dive, buffers, and fork links and the removal/re-assembly of parts

Tubeless Rims

If we can do it so easily, you can too!

  1. How to mount a tire in only 45 seconds (in sandals on your lunch break).

  2. How to use air pressure to set the tire bead.

  3. How to remove a tire in only 82 seconds.