Thanks for the reply.Kart that is binding can cause extra heat... Hot air this time of year is LESS dense, so mixture tends to be richer in effect -- not leaner, Plug heat range could possibly be issue, adding more fuel should help cool, but you don't want that at the expense of carb tune... Change to a more open flywheel screen?
We have 13 to 15 karts in our class, and I'm currently leading the points. I have a top 3 kart most nights, so it's competitive.H
How competitive are you in your class, asking because being gear bound will definitely effect the temp. If your keeping up with the front of the field I would definitely check timing, and bore of carb.
Thanks Brian, that is very useful information!Each heat range in the Denso plug line drops the cht 10-15*F. Ie, if you're running the typical Autolite 411 equivalent in Denso, it's an ND W24 FS-U plug. Going to one step colder heat range plug (ND W 27 FS-U) will pull 10-15* out of the engine -- that'll put you in a bit safer range.
You can go colder yet to a 31 heat range plug, but you shouldn't have to on a stocker.
Pipe, gearing, jetting, kart free-ness, so much more, affects temps in an air cooled engine like these.
?Thanks and God bless,
Carlson Racing Engines
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From what everyone is telling me, 450° is not sustainable over a period of time, as it well wear out the motor quicker. Furthermore, I'm told the proper range is 410°. to 425° for these flatheads to make the most power.I thought yrs ago that 450 degrees was where you wanted to be on engine temp during the race.