#2010 TRIUMPH THUNDERBIRD SPECS INSTALL#
Install each spark plug by hand until you have wound the thread a couple of turns.When you’ve removed your spark plugs, check the condition of the threads in the cylinder head and put a cloth over the cylinder head if you’re going to leave it exposed.
Motorcycle Spark Plug Fitting Guide + Tips Engine power will be reduced and you risk piston damage.Ĭauses: Insufficient cooling, blocked injectors, too lean a fuel mixture, ignition timing too far advanced, excessive combustion chamber deposits. If the temperature is over 850-degrees, pre-ignition may occur. If the engine is running dangerously lean the whole plug tip will be grey or white. If the engine is running lean then the spark plug has a grey colour but you’ll probably see some black deposits on there too.Ĭauses: Insufficient cooling, blocked injectors, too lean a fuel mixture Very Lean This can cause misfires and poor engine starting.Ĭauses: The causes of this can be anything from, a rich fuel mixture, too much choke, long periods of low-speed riding or idling in traffic, a blocked air filter or the plug’s heat range is too cold. A heavy accumulation of carbon on the nose can cause a leakage path to earth. If it’s just dark or black the bike could be running too rich. If the plug has oil on it, then it’s oiling up and may not work efficiently, potentially causing a misfire or stuttering under hard acceleration. There are many different causes of spark plug fouling. Even when a plug is in good condition small deposits will accumulate. If the plug is brown or light grey your can assume your engine is in good condition and the spark plug is functioning well. Full descriptions below.īefore you throw your old spark plug in the bin, check them to get an understanding of how well your engine is running. From left to right the plugs are Normal, Rich, Lean and Very Lean. The image of the spark plugs above shows four common conditions that you’ll find your spark plugs in. Triumph Spark Plug Fitment Chart Manufacturer
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