Brisk Spark Plugs, suitable for classic and vintage motorcycles.

Great spark over a wide heat range and very reliable in older engines that may run a bit dirty from time to time.

If you can't see what you need, please contact us
F2 Motorcycles Ltd
290 Leverington Common
Wisbech, Cambridgshire
PE13 5JG

Workshop Open
9.00am - 5.00pm Tues - Sat

Phone 01945 410165
2.00pm - 5.00pm Tues - Sat

VAT Number GB 715 2467 43

Brisk Spark Plugs

We have been using Brisk spark plugs for over a decade as they are original equipment fitted to some of our motorcycles.

In the past, when they eventually needed changing we swapped them for easily available alternatives from well know manufacturers.
Strangely the replacement plugs did not last as long and did not run as well.

We contacted Brisk and are now please to offer a range of plugs to suit many traditional motorcycles.
We urge you to try them and find out just how good they are.

Made in Europe, Est 1935
Brisk Spark Plugs

Brisk Numbering System

N Series
M14 x 1.25 pitch
Thread length 12.7mm

L Series
M14 x 1.25 pitch
Thread length 19 mm

Y - projected electrode

R - internal resistor

Brisk Spark Plugs

Brisk spark plugs have a very wide heat range, there is no 13 or 16 so they cover most motorcycle needs with just 4 different heat ranges.

This wide heat range is very useful for older type engines running carburetors.

Brisk plugs recover well from over rich mixture due to excessive choke of flooding on start up.

They will not cure incorrect carb set up, but they tolerate small variations in mixture very well indeed.
Reliable Spark Plugs at an Affordable Price

All spark plugs are £3.00 each

P&P Charges

Up to 4 spark plugs - £2.40

5 to 8 spark plugs - £3.96

9 to 12 spark plugs - £5.40

All prices include VAT


Spark plugs are posted 2ND class

Example you order 6 spark plugs
6 spark plugs at £3.00 is £18.00 plus £3.96 P&P making the total £21.96

Phone 01945 410165
2pm to 5pm
Tuesday to Saturday


N - Series
M14 x 1.25 short reach
BRISK - NGK
N17C - B5HS
N15C - B6HS
NR15C - BR6HS
N15YC - BP6HS
NR15YC - BPR6HS
N14C - B7HS+B8HS
NR14C - BR7HS+BR8HS
N14YC - BP7HS+BP8HS
NR14YC - BPR7HS+BPR8HS
N12C - B9HS

N - Series
M14 x 1.25 short reach
BRISK - CHAMPION
N17C - L86C+L90C
N15C - L82C
NR15C - RL82C
N15YC - L87YC
NR15YC - RL87YC
N14C - L78C
NR14C - RL78C
N14YC - L78YC+L82YC
NR14YC - RL82YC

L - Series
M14 x 1.25 long reach
BRISK - NGK
L17C - B5ES
LR17YC - BPR5ES
L15C - B6ES
LR15C - BR6ES
L15YC - BP6ES
LR15YC - BPR6ES
L14C - B7ES+B8ES
LR14C - BR7ES+BR8ES
L14YC - BP7ES+BP8ES
LR12C - BR9ES


L - Series
M14 x 1.25 long reach
BRISK - CHAMPION
L17C - N5+N5C
LR17YC - RN11YC+RN12YC
L15C - N4+N4C
LR15C - RN4C
L15YC - N9YC+N10YC
LR15YC - RN9YC+RN10YC
L14C - N2C+N3C
LR14C - RN2C+RN3C
L14YC - N7YC+N8YC
LR12C - RN1C
Brisk Spark Plugs

Resistors are fitted to spark plugs to reduce electrical noise, they act as a suppressor.
Our advice is as follows.
Bikes running magneto ignition should not have suppressor plugs or caps fitted.
Bikes running coil ignition either with points or electronic ignition should use either a suppressor plug or cap.
Bikes fitted with high power ignition systems and sensitive modern electronic dash boards may need both suppressor plugs and caps together.
You should always refer to the original manufacturers, but allow for any modifications, such as after market electronic ignition.

12 mm and 10 mm plugs.
We can help with exact cross references if you contact us.
AR12C 10mm LONG
NGK CR8E
NAR14YC 10mm SHORT
NGK CPR7HS+CR7HS
B12C 12mm LONG
NGK D8EA+D8C
BBR12C 12mm LONG
NGK DR8EA+DR8ES
B14C 12mm LONG
NGK D7ES
Fitment Guide for just a few motorcycles.
This is a guide only, please double check original specifications in your owners manual or cross reference against the NGK recommendation.
If you require resistor plugs simply insert the letter R after the L or N
AJS OHV most OHV models 14 mm short reach plugs
N15C
Ariel Leader/Arrow
L14C
BMW R80 R80RS R80RT etc + late R100 mono shock
L15YC
BMW late R100 mono shock
L15YC
BMW R100 R100GS R100RT
L14YC
BSA Bantam D1 - D7 short reach
N15C
BSA A7 and A10 short reach
N14C
BSA A10, A50, A65 long reach
L14C
Harley Davidson 1340 Carburetor bikes
LR17YC
Jawa - CZ most models to 2010
N14C
Jawa 350 twins from 2010
NR15C
Matchless most 1950 to 1964 long reach
L15C
Moto Guzzi V50 small block twins
L14C

Moto Guzzi T3-G5 Big twins with carburetors
L15YC
MZ 250 points models
N14C
MZ 250 electronic ignition
NR14C
Royal Enfield (India) 350
N14C
Royal Enfield (India) 500 points
L14C
Royal Enfield (India) 500 electronic ignition
LR14C
Royal Enfield (India) Electra X 500
LR12C
Triumph T120 650cc
L14C
Triumph T140 750cc
L15C
Ural 650 OHV
NR15YC
Ural 750 OHC carburetor + EFI after 2019
NR14YC
Ural 750 OHC EFI MK1 from 2014 to 2018
NR15YC
Vespa 125E
NR14C
Villiers engines using 14mm short
N15C
Brisk Spark Plugs

JR19 - £3.00 each

Garden Machinery Plug.

Great wide heat range short dumpy plug with M14 thread and 9.5 mm long thread.

Direct replacement for the Briggs and Stratton BS19LMR, NGK BR2LM, Champion RJ19LMT and RJ19LMW to name a few.

Fits a wide range of lawn mowers.

The not very small print. Cross references are supplied for information only. However owners make changes to vehicles over time, for example raising the compression, skimming heads or fitting different cams. Also vehicles are driven differently, one owner may potter about and require a plug that gets up to temperature quickly (Hotter Plug) where as another owner may spend all of their time at higher speeds doing longer journeys so would benefit from a colder plug. When ever you change plugs we would always advise to have a quick look at it after a trip of 15 to 20 miles. If it is spotlessly clean with no deposits at all even where the base of the thread is touching the head, you should move to one grade colder (from L15C to L14C for example). If the plug is dry and sooty, even at the hottest part of he electrode tip you should consider riding harder, or changing a plug one grade hotter (from N14C to N15C for example.
F2 Motorcycles Ltd are not responsible for any damage caused by incorrect plug selection.



Full details of how to place and order and our delivery charges can be found on the ordring page.


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