Nut M4 mm SAE, spark plug, NGK

This product fits on almost all products
Product description
In the area of scooters with relatively low capacities and high revs, high demands are made of the spark plugs. Overheating with the risk of the sticking or sooting up of the spark plug are frequent problems with the incorrect choice of
spark plug
.

Spark plugs are available with different
thermal values
(stated as a figure in the type code and different from one manufacturer to the next),
materials
(e.g. copper, silver, platinum) as well as in certain
standard unit sizes
(which differ in terms of length, diameter and thread).
Interference-suppressed
spark plugs are a good idea with usage of rev counters i.e.. Also radio frequencies of mobile phones, radios etc. are not affected. They are not recommended with weak ignitions, however. They are marked with a “R” in the item description.

Colder spark plugs
are suitable for racing cylinders and use over long distances. In this context, the sound thermal output of heat to the cylinder head takes place, there is a risk of sooting, however.

Hotter spark plugs
are used in sport and standard cylinders. The reach their operating temperature quickly but can also overheat.
Most spark plugs for scooters have a M14x1.25 SW 20.8 thread and are either long thread (19mm) or short thread (12.7mm). Please note: putting a long thread spark plug in a short thread cylinder head will damage the piston.

We only stock high quality spark plugs from
BOSCH
,
DENSO
,
NGK
and
CHAMPION
in our product range.
BOSCH
is a German manufacturer while
NGK
and
DENSO
are Japanese.
CHAMPION
is an American manufacturer and
original

equipment manufacturer
at Vespa.
Also from the USA are the spark plugs from
E3
, which we have had in our range since August 2021: The unique architecture of the ground electrode creates more turbulence in the fuel-air mixture, promoting faster growth and a larger flame core. By burning the fuel more completely, more fuel is burned with less waste, resulting in more power and better fuel efficiency.

Conclusion:
regular exchange/replacement is compulsory. Spare spark plugs belong in every luggage compartment.

TPP: order a new ignition cable and new spark plug socket at the same time. All required information on spark plugs with a description of thermal value, spark plug designations, interference resistance and a comparison of the manufacturers is available both at www.sip-scootershop.com and as a PDF download. Further types of spark plug are also provided here.