Tightening torques Torques Vespa & Lambretta

Tightening Torques for Screws and Nuts on Scooters

How tight should I fasten a screw or nut on a scooter?

We have compiled a list of the manufacturer-recommended tightening torques*.

  • Lambretta
  • VESPA Largeframe -1977 (125-150 cc)
  • VESPA PX 80-200
  • VESPA Smallframe

Too tight and it breaks!

It's happened to all of us: the workshop saying "Too tight and it breaks!" - SNAP - and suddenly it's true. Not a huge problem if you've only destroyed a nut or stud, these are usually easy to replace. It's already annoying when you don't have a spare on hand. Thread repair: It gets really annoying if you've damaged a thread in the engine case! That often becomes complicated and expensive, especially if it can't be repaired with a thread insert. Before replacing or welding the case, thread repair using Weicon adhesive might be an option.

Loose screw?

Besides overtightening, there's also not tightening enough! Loose nuts or bolts can be dangerous. You don't want to imagine what could happen if wheel nuts or brake disks come loose. Loose carburetors, intake manifolds, or cylinders can quickly cause engine damage. Depending on the application, self-locking nuts or thread locker might be advisable!

Follow the proper sequence!

It's also important to tighten screws and nuts evenly. Everyone knows this from changing tires-tighten in a cross pattern, for example, to ensure an even fit. On engine housings or cylinder heads, unevenly tightened studs should be avoided to prevent tension. Some components even require a specific tightening sequence. Always follow the manufacturer's instructions. Sequence of stud bolts Vespa engine

Wrong direction!

Right-hand thread? Left-hand thread? Generally, nuts and bolts tighten clockwise (right-hand thread) and loosen counterclockwise. But there are exceptions like the flywheel nut on Lambretta and left mirrors, which often use left-hand threads.

Tight!

For many jobs, you'll need special tools, pullers and especially holders-otherwise, parts often can't be loosened. You'll find the right tools for your scooter model after selecting it from the vehicle list:
Vespa special tools For stuck connections, penetrating oil like WD40 often helps!

Torque Wrench

We recommend consistently using a torque wrench and adhering to the recommended tightening torques. We offer various torque wrenches for small and large jobs:

Torque wrench Vespa Lambretta Scooter

LAMBRETTA

Lambretta Torque Specs
Original MB Developments
Flywheel/Fan Nut68 Nm75 Nm
Exhaust/Intake Cylinder Nuts4.7-5.2 Nm9.8-11.8 Nm
Cylinder head nuts19-22 Nm20-24 Nm
Ignition Base Plate Screws4.7-5.2 Nm
Gear Selector Bolt (9 mm)4.7-5.2 Nm
Transmission Cover Nuts9.8-11.8 Nm14-17 Nm
Front Sprocket Bolt29-34 Nm
Chain Cover Nuts (10 mm)4.7-5.2 Nm
Rear Brake Cam Bolt (gear control)4.7-5.2 Nm
Rear Wheel Bearing Cover Plate Nut4.7-5.2 Nm
Brake Drum Nut (8° + 11° taper)161 Nm
Brake Drum Nut (20° taper)203 Nm
Brake drum nut lock14-14.7 Nm
Fork Left54-55 Nm
Front Axle Nut54-55 Nm
Rim Fastening Nuts19.6-22.5 Nm
Oil Seal Retaining Plate (gear control)4.7-5.2 Nm
Chain Guide (gear control)4.7-5.2 Nm
Transmission Spacer (gear control)0.07-0.30 Nm

VESPA Largeframe -1977 (125-150 cc) VNA-VBB, GL, GT, GTR, TS, Sprint, Super

Torque Specs Vespa Largeframe pre-1977
Nm
Crankcase Halves Nuts12-15 Nm
Stator Plate Screw3-5 Nm
Clutch Nut40-45 Nm (up to 65 depending on clutch)
Secondary Shaft Nut30-35 Nm
Gear Selector Cross (left-hand thread, thread lock)15-18 Nm
Rotor Nut (Flywheel)60-65 Nm
Carburetor Mounting Screw16-20 Nm
Clutch Cover Screw6-8 Nm
Exhaust Manifold (P200)75-80 Nm
Exhaust to Cylinder Nut16-26 Nm
Aluminum Cylinder (follow manufacturer specs)14-16 Nm
Cylinder head groove (P 125 X, P 150 X, M7)16-18 Nm
Cylinder head groove (P 200 E, M8)20-22 Nm
Spark Plug (follow manufacturer specs)20-24 Nm
Engine Swing Arm Bolt60-75 Nm
Lower Shock Mounting NutM9 = 14-22 Nm, M10 = 16-24 Nm
Wheel Rim to Drum Mounting Nut20-22 Nm

VESPA PX 80-200

Torque Specs Vespa PX
Nm
Crankcase Halves Nuts12-15 Nm
Stator Plate Screw3-5 Nm
Clutch Nut40-45 Nm (up to 65 depending on clutch)
Secondary Shaft Nut30-35 Nm
Gear Selector Cross (left-hand thread, thread lock)15-18 Nm
Rotor Nut (Flywheel)60-65 Nm
Carburetor Mounting Screw16-20 Nm
Clutch Cover Screw6-8 Nm
Exhaust Manifold (P200)75-80 Nm
Exhaust to Cylinder Nut16-26 Nm
Starter Motor Groove (M8)10-15 Nm
Starter Motor Screw (M6)6-8 Nm
Aluminum Cylinder14-16 Nm (see manufacturer specs)
Cylinder Head Nut PX 125-150 (M7)16-18 Nm
Cylinder Head Nut PX 200 (M8)20-22 Nm
Spark Plug (see manufacturer specs)20-24 Nm
Engine Swing Arm Bolt60-75 Nm
Lower Shock Mounting NutM9 = 14-22 Nm, M10 = 16-24 Nm
Wheel Rim to Drum Mounting Nut (front/rear)20-22 Nm

*We have compiled this information to the best of our knowledge, but we assume no liability for the accuracy.

VESPA Smallframe V50, PV, ET3, PK 50-125

Torque Specs Vespa Smallframe
V50, PV, ET3 PK
Crankcase Halves Nuts13-15 Nm13-15 Nm
Stator Plate Screw3-5 Nm3-5 Nm
Kickstarter Screw23-26 Nm23-26 Nm
Primary Gear Nut50-55 Nm50-55 Nm
Clutch Nut40-45 Nm (up to 65)40-45 Nm (up to 65)
Gear Selector Fork Screw17-22 Nm
Flywheel/Fan NutM10 = 45-50 Nm, M12 = 60-65 Nm
Intake Manifold Nut6-8 Nm8-10 Nm
Exhaust Manifold to Cylinder (M6/M8)8-10 Nm8-10 Nm
Clutch Cover Screw8-10 NmPK 50: 8-10 Nm PK 80-125: 9-10 Nm
Brake Anchor Plate Nut17-22 Nm17-22 Nm
Engine Swing Arm Bolt38-50 Nm
Brake Drum NutM14 = 60-100 Nm, M16 = 90-110 Nm
Oil Drain and Fill Plug3-5 Nm
Gear Shift Fork Screw17-22 Nm
Exhaust Bolt to Engine Swing Arm18-20 Nm18-20 Nm
Pick-Up Screw2-2.5 Nm2-2.5 Nm
Fan mounting screw (Dynastart)8-10 Nm
Dynastart Group Nut (?)60-65 Nm
Aluminum Cylinder13-18 Nm (see manufacturer)12-18 Nm
Cylinder Head NutV50: 14-18 NmPK 50: 13-18 Nm
Cylinder Head NutPV, ET3: 14-18 NmPK 80-125: 13-18 Nm
Cylinder Base NutV50: 12-16 NmPK 50: 12-16 Nm (not HP)
Spark Plug (see manufacturer)14-18 Nm18-24 Nm
Rear Axle Stub Nut (under swing cover)50-55 Nm50-55 Nm
Locking Nut Front Axle (V50 w/ or w/o speedo drive)45-50 Nm45-50 Nm
Speedo Drive Ring NutPV/ET3: 45-50 Nm
Upper Shock Mount Nut20-27 NmPK 50: 20-30 Nm PK 80-125: 30-40 Nm
Lower Shock Mount Nut20-27 NmPK 50: 20-30 Nm PK 80-125: 20-27 Nm
Engine Swing Arm to Frame Nut38-52 Nm38-52 Nm
Upper Headset Bearing Ring (hand-tight to bearing contact)6-7 Nm (check)50-60 Nm (check)
Lock Ring for Upper Headset Bearing (after reaching torque, back off ~1/4 turn)50-60 Nm (check)
Handlebar Bolt30-44 Nm30-44 Nm
Notched Nut Upper Headset Bearing 30-40 Nm
Rear Axle Nut90-110 Nm90-110 Nm
Wheel Nuts front/rear to Brake Drum23-27 Nm20-27 Nm
Front Wheel Central Nut75-90 NmPK 50: 50-80 Nm PK 80-125: ?

*We have compiled this information to the best of our knowledge, but we assume no liability for the accuracy.

Autor
Thomas Kuhnen