Some useful data to maintain your Velocette

 

 

Recommended lubricants and fluids :

 

Component

Grade

Engine

20W/50

Gearbox

SAE 40 or 50 (important : NON EP)

Primary Chain Case

20W/50

Telescopic Forks

10W/30

 

 

Important notice : Gearbox oils 75/80 or 90 EP (as Extrem Pressure) are not compatible with internal gearbox bronze rings which are definitely destroyed.

 

 

Routine maintenance :

 

Contact breaker gap :

Magneto ignition :

0.012 - 0.015 inches (0.30 0.38 mm)

Coil ingnition :

0.014 - 0.016 inches (0.35 0.41 mm)

 

Ignition timing : 38 before TDC, ignition fully advanced (except MSS : 36)

 

Valve clearance (engine cold) :

Inlet :

0.005 inch (0.12 mm) MAC only

Exhaust :

0.005 inch (0.12 mm) MAC only

Inlet :

0.006 inch (0.15 mm) all but MAC

Exhaust :

0.008 inch (0.20 mm) all but MAC

 

Spark plug gap : 0.018 - 0.023 inches (0.45 0.58 mm)

 

 

 

 

 

 

Rims : (front and rear) WM2 x 19 all but Scramblers

 

 

Tyre size :

Front : 3.25 x 19 all but Scrambler and Thruxton

or : 3.00 x 19 ribbed thread - Thruxton

or : 3.00 x 21 Scrambler

 

Rear : 3.50 x 19 all but Scrambler

or : 4.00 x 19 Scrambler (racing)

 

Tyre pressure :

Front : 18 psi MAC, MSS, Viper, Venom, (including Clubman)

or : 19 psi Viper and Venom Veeline

or : 21 psi Scrambler

or : 22 psi Thruxton

 

Rear : 24 psi MAC, MSS, Viper, Venom, (including Clubman)

or : 25 psi Viper and Venom Veeline

or : 16 psi Scrambler

or : 24 psi Thruxton

 

 

 

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