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Don't adjust the timing, I don't believe you would have to do that. Getting a smoky HDJ81 in canada after it comes from Japan is not a rare thing.
There are two possibilities - boost compensator and the amount of fuel going in - oh and injectors. If you think the injectors are fine then dont bother rebuilding them.
A local guy has the same issues here in Ottawa, we will be making some adjustments shortly, his smokes all the time and has plenty of power - I think it is overfuelled. The key is to keep the power while reducing smoke using.
Will let you know what I find works best.
Louis
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