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ElectricalSpark Plugs |
Spark PlugsSpark plugs come in many different shapes and sizes. The information here relates to spark plugs manufactured by NGK which are suitable for Vespas and Lambrettas. There are two basic types used on classic Italian scooters. The main difference between the two types is the reach of the threaded section into the combustion chamber. The use of a long thread type plug in a short thread head may allow the plug to touch the piston head at top dead center which can cause serious damage.
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To the left is an example
of a short reach plug - NGK plugs are classified with
the following numbers and letters - Example
B7HS
B: Indicates 14mm thread diameter in the cylinder head. This diameter is used on all Vespas & Lambrettas 1-9: Indicates temperature (1 Hottest - 9 coldest). H: Indicates 12.7mm thread reach (approx 1/2") S: Standard electrode This type of plug is used on most older bikes before the Vespa Rally 180 and is NOT used on Lambrettas - but double check your plug type before fitting any plug. |
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To the left is an example of a long reach plug - NGK plugs are classified with the following
numbers and letters - Example B8ES
B: Indicates 14mm thread diameter in the cylinder head. This diameter is used on all Vespas & Lambrettas 1-9: Indicates temperature (1 Hottest - 9 coldest). E: Indicates 19mm thread reach (approx 3/4") S: Standard electrode This type of plug is used on most newer bikes after the Vespa Rally 180 and all Lambrettas - but double check your plug type before fitting any plug. |
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Full NGK plug codesBelow is a full list for anyone who might want to mess around with plugs for different applications. Click the mouse over a part of the example plug code to see the options and click again to close the window.
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