Is anyone running a colder spark plug then stock?? Would it keep the engine temps down??
That's what I'm wondering.. I have 143, v2, 32mm throttle body, and full port work, intake exhaust, blah blah blah lol.. grabbed a "one step colder" plug but not sure if I'd benefit putting it on.. I know I have higher compression now, but I don't want to run to cold of a plug either..You guys do know that "hot" or "cold" on a spark plug is just a matter of the insulator shape and it's join to the metal body, right? A "cold" plug transmits more acquired combustion chamber heat to the cylinder head. A "hot" spark plug has more exposed insulator (acquires more heat) and less ceramic insulator material connected to the metal body so it sheds less acquired heat into the head and stays hotter.
A spark plug has to be "hot" enough to resist fouling at low engine temperatures and speeds. It also has to be "cold" enough to avoid detonation at high engine temp/speed. Higher-performance engines, generating hotter combustion-chamber temps, need a colder spark plug to keep the plug tip within the ideal operating range.
Now that I'm thinking about it, I wonder if my bike (143cc BBK and V2 race head) could benefit from a plug colder than stock.
Isn't the risk of running too cold of a plug simply premature plug fouling and misfires? Seems worth trying if you already have the plug on hand....but I don't want to run to cold of a plug either..