Thread: Ironhead starting with mikuni carb
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Old 29th September 2011
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This is just a wild guess, but could you have a big intake manifold air leak? Spraying propane around the manifold with the engine just above idle might give you an indication of this, if the rpms increase.

Have you checked your plugs for indication of burn mixture? Starving for gas and indications of lean mixture sometimes is indicative of a manifold leak.

Again, just wild guesses on my part. I'd go with whatever Piniongear recommends. He's the expert on Mikuni 38mm carbs. The Miks may not be the ultimate in high performance carbs, but they sure are dependable, easy to tune, and otherwise trouble free. And with all the voodoo it sometimes seems to take to keep an ironhead running consistently well, it is nice to know that you have a simple and dependable carberator on the bike. Good luck, and let us know what ends up working for you.
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