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NGK SPARK PLUGS Top quality guaranteed with NGK spark plugs! More than 90% of all Japanese engines come factory-equipped with NGK spark plugs! Although a spark plug may seem unremarkable, it has a significant impact on fuel economy, starting performance, and engine power. Vehicle manufacturers have determined the optimal spark plug for your bike through extensive testing. Therefore, always adhere to the manufacturer’s specifications. All spark plugs marked with an 'R' have an integrated 5 kOhm suppression resistor, which is only necessary if 5 kOhm suppression plugs are not already in use. A total of 5 kOhm per cylinder is sufficient for suppression. If the total exceeds 10 kOhm, the ignition energy of the spark may be reduced. IMPORTANT NOTE: Before (!) purchasing and before (!) installing spark plugs, you must always verify that the spark plugs you have selected exactly meet the specifications and approvals according to the manufacturer’s owner’s manual! Use only products and specifications approved for your vehicle. Failure to do so may result in serious damage to your vehicle, for which we hereby disclaim any liability or warranty.