johnh Posted May 4, 2009 Report Share Posted May 4, 2009 I have changed the carb on my Montesa 123 for a Mikuni with a main jet of 190. The exhaust is now leaking black oily gunge, is this because the jet is too big or is it something else. The plug is a NGK B6ES. Cheers John Quote Link to comment Share on other sites More sharing options...
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