Reply to "Header temps"

4vandproudMember

are your 4180 carbs the kind that the idle mix screws control air rather than fuel, opening the mix screw adds more air (lean) opposite of the standard commercial Holleys that the idle mix screw controls fuel?

either way all bets are off getting into carb signal, your cam & doubling up the carb count. one would think that the dual carbs have the capacity to supply sufficient idle fuel but they need the signal to do so, 1/2'ing the signal is a big ? as to what the engine is really getting, & same through the mid & full power ranges too

keep it simple, single cylinder 2 stroke bikes if you change the pipe then the jet needs to be tuned while watching the plug

limited equivalent listings, sounds like a small player trying to hang with the real plug mfgrs that actually produce a plug for each established heat range, a Jedi mind trick

12/26/1510:29 AM

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