Drehmoment Motorroller

Tightening torques for bolts and nuts on the scooter

How tight should I tighten a bolt or nut on the scooter?

Here we have compiled a list of the recommended tightening torques of the manufacturers.*

Too tight!

It has probably happened to everyone at least once, KNOCK and the screw / bolt is off or the thread is broken.
No problem, if you have only destroyed a nut or a stud bolt, it can usually be easily replaced. It already starts to get annoying when you don’t have a replacement available.
Thread repair: It gets really annoying if you have destroyed a thread in the engine housing! This often becomes complex and usually expensive, especially if it cannot be repaired with a thread insert. Before the housing has to be replaced or welded, a thread repair with Weicon adhesive is often possible.

Too loose!

Apart from being too firm, there is of course also not firm enough! Nuts or screws that are too loose can be dangerous. You don’t even want to think about what can happen if wheel nuts or brake discs come loose. Loose carburettors, intake manifolds or cylinders quickly cause engine damage. Depending on the area of application, self-locking nuts or screw locking are the best choice!

In the right order!

In addition, the even tightening of screws and nuts must also be taken into account. Everyone knows this from changing tires, here they are tightened by e.g. crosses to guarantee an even fit. Also with engine housings and cylinder heads e.g. tensions caused by unevenly tightened studs should be avoided. There are even components for which a certain order of fastening must be considered. Please follow the manufacturer’s instructions here.

Reihenfolge Stehbolzen Vespa Motor

Wrong way!

Right-hand thread? Left-hand thread? Normally nuts and screws are tightened clockwise (right-handed) and loosened counter-clockwise (left-handed) = normal right-hand thread. But there are also exceptions, such as the polar wheel nut Lambretta and left-hand mirrors: often with left-hand thread.

Solid!

For many applications there are special tools, pullers and especially holders, without which parts usually cannot be detached at all. You will find the tool for your scooter model after selecting the vehicle in the vehicle list:

Vespa Spezialwerkzeug

In case of tight connections, penetrating oil such as WD40 often helps!

Torque wrench

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

Drehmoment Schlüssel Vespa Lambretta Motorroller

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LAMBRETTA

Torque Lambretta

originalMB Developments
Nut flywheel/fan wheel68 Nm75 Nm
Cylinder outlet/inlet nuts4.7-5.2 Nm9.8-11.8 Nm
Cylinder head nuts19-22 Nm20-24 Nm
Screws ignition base plate4.7-5.2 Nm
Screw shift claw (9 mm)4.7-5.2 Nm
Nuts Gearbox cover plate9.8-11.8 Nm14-17 Nm
Screw front sprocket29-34 Nm
Nuts Chain cover (10 mm)4.7-5.2 Nm
Rear brake shoe pivot pin (gear ratio contr.)4.7-5.2 Nm
Nut Cover plate rear wheel bearing4.7-5.2 Nm
Brake drum nut (8° + 11° cone)161 Nm
Brake drum nut (20° cone)203 Nm
Fuse Brake drum nut14-14.7 Nm
Fork Links54-55 Nm
Nut Front axle54-55 Nm
Rim fixing nuts19.6-22.5 Nm
Oil seal Retaining plate (transmission ratio contr.)4.7-5.2 Nm
Chain guide (gear ratio contr.)4.7-5.2 Nm
Gearbox distance (gear ratio contr.)0.07-0.30 Nm

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

Torques_Vespa-Largeframe-to-1977

Nm
Nuts Housing halves12-15 Nm
Stator plate screw3-5 Nm
Nut Coupling40-45 Nm (depending on the clutch up to 65)
Nut Auxiliary shaft axis30-35 Nm
Switching cross (left-hand thread, screw lock)15-18 Nm
Nut rotor (pole wheel)60-65 Nm
Carburettor fixing screw16-20 Nm
Screw Clutch cover6-8 Nm
Outlet connection (P200)75-80 Nm
Nut Exhaust on cylinder16-26 Nm
Aluminium cylinder (observe manufacturer’s instructions)14-16 Nm
Nut cylinder head (P 125 X, P 150 X, M7)16-18 Nm
Nut cylinder head (P 200 E, M8)20-22 Nm
Spark plug (observe manufacturer’s instructions)20-24 Nm
Crosshead screw Motor swing arm60-75 Nm
Nut lower shock absorber mountingM9 = 14-22 Nm, M10 = 16-24 Nm
Nut Rim mounting Brake drum (v/h)20-22 Nm

VESPA PX 80-200

Torques_Vespa-PX

Nm
Nuts Housing halves12-15 Nm
Stator plate screw3-5 Nm
Nut Coupling40-45 Nm (depending on the clutch up to 65)
Nut Auxiliary shaft axis30-35 Nm
Switching cross (left-hand thread, screw lock)15-18 Nm
Nut Rotor (pole wheel)60-65 Nm
Carburettor fixing screw16-20 Nm
Screw Clutch cover6-8 Nm
Outlet connection (P200)75-80 Nm
Nut Exhaust on cylinder16-26 Nm
Nut Starter motor (M8)10-15 Nm
Starter motor screw (M6)6-8 Nm
Aluminium Cylinder14-16 Nm (see manufacturer specifications)
Nut cylinder head PX 125-150 (M7)16-18 Nm
Nut cylinder head PX 200, (M8)20-22 Nm
Spark plug (observe manufacturer’s specifications)20-24 Nm
Crosshead screw Motor swing arm60-75 Nm
Nut lower shock absorber mountingM9 = 14-22 Nm, M10 = 16-24 Nm
Nut Rim fixing v/h Brake drum20-22 Nm

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

Torques_Vespa-Smallframe

V50, PV, ET3PK
Nuts Housing halves13-15 Nm13-15 Nm
Screw anchor plate3-5 Nm3-5 Nm
Screw kick starter23-26 Nm23-26 Nm
Nut Primary gear50-55 Nm50-55 Nm
Nut Coupling40-45 Nm (depending on clutch up to 65/)40-45 Nm (depending on the clutch up to 65)
Screw for shift fork17-22 Nm
Nut Pole wheel/fan wheelM10 = 45-50 Nm, M12 = 60-65 Nm
Nut Suction port6-8 Nm8-10 Nm
Exhaust manifold on cylinder (M6/M8)8-10 Nm8-10 Nm
Clutch cover screw8-10 NmPK 50: 8-10 Nm PK 80-125: 9-10 Nm
Nut Brake anchor plate17-22 Nm17-22 Nm
Crosshead screw Motor swing arm38-50 Nm
Nut brake drumM14 = 60-100 Nm, M16 = 90-110 Nm
Oil filler and drain plug3-5 Nm
Screw for manual transmission fork17-22 Nm
Bolt exhaust to swing arm18-20 Nm18-20 Nm
Screw Pick Up2-2.5 Nm2-2.5 Nm
Screw for fan mounting (Dynastarter)8-10 Nm
Mother Group Dynastarter (?)60-65 Nm
Aluminium Cylinder13-18 Nm (see manufacturer’s specifications)12-18 Nm
Nut cylinder headV50: 14-18 NmPK 50: 13-18 Nm
Nut cylinder headPV, ET3: 14-18 NmPK 80-125: 13-18 Nm
Cylinder base nutV50: 12-16 NmPK 50: 12-16 Nm (not HP)
Spark plug (observe manufacturer’s instructions)14-18 Nm18-24 Nm
Nut Hub spigot (under swingarm cover)50-55 Nm50-55 Nm
Locking nut front wheel axle (V50 with or without speedo drive pinion)45-50 Nm45-50 Nm
Ring nut of the speedometer drivePV/ET3: 45-50 Nm
Nut upper shock absorber mounting20-27 NmPK 50: 20-30 Nm PK 80-125: 30-40 Nm
Nut lower shock absorber mounting20-27 NmPK 50: 20-30 Nm PK 80-125: 20-27 Nm
Nut of the engine swing arm on the frame38-52 Nm38-52 Nm
Upper race of the upper headset bearing (or hand-tight until contact with bearing balls)6-7 Nm (check)50-60 Nm (check)
Upper ring nut to lock the upper steering head bearing (after the tightening torque is reached, turn back the wrench by approx. 1?4 turn (80-90°))50-60 Nm (check)
Handlebar Bolt30-44 Nm30-44 Nm
Upper head race nut30-40 Nm
Nut Rear wheel axle90-110 Nm90-110 Nm
Nuts Rims v/h on brake drum23-27 Nm20-27 Nm
Central nut front wheel75-90 NmPK 50: 50-80 Nm PK 80-125: ?
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*We have worked here to the best of our conscience, but all information is nevertheless without guarantee.

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