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Stock 80" EVO with 2-1 Supertrapp header, Arlen Ness Big Sucker air cleaner, 175/45 jetting and Ultima ignition. Currently running with no muffler/baffler since I’m waiting for a new one (postage takes time since I live in europe). A lot of decell popping when i release the throttle at high RPM, but nothing at lower RPM. Took out the plugs today, to have a look. What do you guys think? Worried about running to lean, don't want any engine damage when running without muffler.
I don't see lean, and in addition to said above, looks rich on the base ring (the low circuit) or from using the enrichener, however 45 is about right for slow.
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Spark plug color?
