![]() ![]() Symptoms: Light brown deposits encrusted on the side or center electrodes or both. Recommendations: When new spark plugs are installed replace with plugs of the same heat range. Correct heat range for engine and operating conditions. ![]() Symptoms: Brown to grayish-tan color and slight electrode wear. Recommendation: Locate the faulty plug and remove the deposits from between the electrodes. ![]() The plug ceases to fire… resulting in a dead cylinder. Heavy deposits accumulate and bridge the electrode gap. Symptoms: Combustion deposits lodge between the electrodes. Consider using a colder plug if driving habits warrant. Normal deposits melt to form a conductive coating. Indicate that combustion chamber temperatures have risen suddenly during hard acceleration. Symptoms: Insulator has yellowish, glazed appearance. Recommendation: Check for the correct plug heat range, over-advanced ignition timing, lean fuel mixture, clogged cooling system and lack of lubrication. Insulators are white, but may be dirty due to misfiring of flying debris in the combustion chamber. Check the coolant level and make sure the radiator is not clogged. Recommendations: Check for the correct plug heat range, over-advanced ignition timing, lean fuel mixture, intake manifold vacuum leaks and sticking valves. Symptoms: Blistered, white insulator, eroded electrode and absence of deposits. Recommendations: Correct the mechanical condition with necessary repairs and install new plugs. Causes hard starting, misfiring and hesitation. Oil is leaking past worn valve guides or piston rings into the combustion chamber. Symptoms: Oily coating caused by poor oil control. Use a spark plug with a longer core nose for greater anti-fouling protection. Recommendations: Check for a clogged air element, high float level, sticky choke and worn ignition points. Causes misfiring, hard shifting and hesitation. Symptoms: Dry sooty deposits indicate a rich mixture or weak ignition. (Just make sure to use gloves as they will be very hot).Ī spark plug can easily and quickly tell you the condition of an engine (good or poor), how it is running (rich or lean) and how much it will cost to fix it. The second way is the same as #1 except you go for a really hard high revving ride on the bike, pull over and then unscrew each plug to read them. The first way is to just unscrew it out of the engine and take a look at the end of it, matching the chart below. There are two different main ways to read a spark plug. Reading a spark plug correctly: (clickable chart) Unfortunately some spark plugs are very specific to a type of engine and make only for that engine such as the NGK ME8 for $34.23 per sparkplug, compared to the “normal” price of $2-4 per sparkplug. Also different brands (NGK, Bosch, DENSO, Champion, Esc) will work better on different types of engines.Īs a general rule of thumb, use the sparkplug your manufacturer recommends for your motorcycle (same brand and part number). But out of that huge selection, only a handful will work with the motorcycle engine you own. ![]() You may of noticed that there are hundreds of types, sizes and brands of spark plugs on the market. Tip: Correctly reading a spark plug can save you a lot of time and money. They do more and can tell you more than you might think. Husqvarna Motorcycles glow with Moto3 podium finish at Mugello News.Perfect Start in 2023 Pro Motocross Championship Continues with Third Straight Moto Sweep at Thunder Valley News.triumphant return to podium at FIM Motocross World Championship Teutschenthal News.Fastest and most picturesque race circuits in the world News.Teutschenthal circuit notorious for rough and rutted terrain a formidable challenge News.Red Bull KTM Factory Racing wins Red Bull Erzbergrodeo 2023 News.Hot windy and busy Talkessel circuit half-way point of FIM Motocross World Championship News.Career-best result at Red Bull Erzbergrodeo News.Very difficult day for Ducati at MotoGP Mugello News.Turbulent and emotional weekend at the Grand Prix of Germany News.Perfect weekend in front of home crowd at Mugello MotoGP News.Super dark in the Virginia woods for Cherokee National Enduro News.2024 Kawasaki: Performance, Excitement and All-out fun! 2024 Motorcycle Models.Fractured neck vertebrae sidelines MXGP KTM rider Jeffrey Herlings News.The Ducati DesertX conquers the Iron Road Prolog at the Erzbergrodeo News. ![]()
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