g520 Posted January 30, 2010 Report Share Posted January 30, 2010 Hi all. I need to carry a spare spark plug in my tool kit, since I am going for longer rides. I searched this forum and found that people are using plugs with different heat range. From 5 to 8. Confusing. Some examples: Quote Link to comment Share on other sites More sharing options...
houseape1000 Posted January 31, 2010 Report Share Posted January 31, 2010 (edited) Clicky Just an example..... As far as I know, if a plug is hot, it means it cant transfer its heat through the cylinder head as easily as a cold plug. There is a well between the threads and the electrode the deeper this is, the colder the plug. Although I stand to be corrected on this, I might have it the wrong way around. There's quite a bit of info on the plug manufacturers sites... Edited January 31, 2010 by houseape1000 Quote Link to comment Share on other sites More sharing options...
b40rt Posted January 31, 2010 Report Share Posted January 31, 2010 Hot plugs transfer heat quicker, cooler plugs run hotter and burn the crap off that builds up during slow running. (correct?) Quote Link to comment Share on other sites More sharing options...
feetupfun Posted January 31, 2010 Report Share Posted January 31, 2010 With NGK plugs, the lower the number, the hotter the tip of the centre electrode operates at. If you are going to ride your Scorpa at sustained high power output, you should use a cool plug ie an 8 or 9 - to prevent the electrode tip from geting too hot. The problems with getting the tip too hot are: The tip disappears fast The tip radiates heat to a localised region of the piston crown and may cause it to soften and develop a hole When the tip glows, the fuel mixture can be ignitied by the glowing metal rather than the spark, so the timing of ignition is no longer being controlled. Quote Link to comment Share on other sites More sharing options...
g520 Posted January 31, 2010 Author Report Share Posted January 31, 2010 Ok. Thanks guys.. Great info. Quote Link to comment Share on other sites More sharing options...
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