3) Type and concentration of the fuel - for example fuels with high alcohol content requires lower A/F ratio and smaller spark plug gaps. The NGK BPR6ES is a spark plug with an alumina ceramic insulator and nickel made center and ground electrode.. The part number you have entered is unknown or incorrect. 5) Engine load and intended use - when engine is under load, the pressures in the combustion chamber is higher as there is more air aspirated, making it harder for spark to occur. Browse the chart to find the spark plug gap you need, then choose the corresponding model. ��High compression engines and engines with forced induction have higher combustion chamber pressures at time of spark discharge. 2) Pressure in the combustion chamber at time of spark discharge - Depends on compression and aspiration of the engine. NGK do not recommend gap adjustment for precious metal spark plugs. SPARK PLUG DESIGN Wide Gap BPR5ES-13 Three ground BCP6ET Extra projected and shielded ZFR6E-11 Twin ground BKR6EK Four Ground BKR6EQUP Precious metal IZFR6B 'Softer' Hot Type (e.g. TollFree 1 800 661 9438 www.transcanimports.com Elec -44 NGK SPARK PLUGS - MOTORCYCLE APPLICATIONS cc Model Year Regular Premium Plug Gap cc Model Year Regular Premium Plug Gap 175 CB175 69-73 DR8HS --- 0.028 175 CL175 68-73 DR8HS --- 0.028 175 MR175 75-77 BR8ES BR8EIX 0.028 Maybe. spark plug application and information evinrude/johnson 1952-2010 evinrude/johnson motors ship with champion spark plugs. Feel free to download this catalog for any information reference of Brisk Spark Plugs. ��, However running a large gap in high cylinder pressure application (which makes it very hard for spark to occur), will demand such a high voltage (electrical pressure) for spark to jump the spark plug gap, that the spark will find an easier way to the ground, possibly where the igniton wire is close to the ground (engine block etc...) or inside of distributor cap, inside of the ignition coil, on the outside of the spark plug (between the plug and the boot) etc... ��In either way the spark will not occur between the spark plug electrodes inside the combustion chamber, and engine misfire will occur. 6) Type of Ignition system - magneto, CD (Capacitor Discharge), or Inductive. With its clear commitment to delivering the highest quality and continuously raising the bar, NGK Spark Plugs is the obvious brand of choice for an array of vehicle manufacturers. ��That means that there is higher voltage build up in the ignition system (ignition coil, distributor, ignition wires) prior to the spark discharge. ��If every cylinder generates exactly the same amount of power, than the time between each pulse is in the same pattern. Electrode Gap. NGK as a company tries to stay clear of saying that a racing spark plug (or ANY spark plug) will give you large gains in horsepower. View full size version of NGK spark plug numbering chart.. View full size version of NGK performance plug numbering chart.. View full size version of NGK premium plug numbering chart. ��Higher fuel concentration has the same effect (lower A/F ratio). NGK has been developing spark plugs for every type of automotive engine, plus motorcycles, marine, horticultural, plant and many others since the 1930s. This spark plug has corrugated ribs, triple gasket seal, copper core for more effective heat removal, a 21 mm (13/16 inches) hex size, and 0.9 mm (0.035 inches) gap. Most Brisk and other manufacturer sparkplugs are preset to around 0.75mm - 0.8mm. ��Some of them are: 1) Potential of the ignition system - Spark Voltage (sometimes explained as Voltage potential or electrical pressure) corresponds with the distance that spark can cross at given air pressure and enviroment (concentration of the A/F (Air/Fuel) mixture etc... between the spark plug gap (center electrode and ground electrode). - magneto, CD ( Capacitor discharge ), or Inductive concentration has the same on! 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