Power surge, I think?

I have an 01 WR 426 and I have been noticing when I am at steady power, say 45-50 mph I feel a "power surge" or actually a quick lose of power then right back to full power, any ideas on what it might be?

Part throttle surge is fairly common on all these Yam Thumpers. I dialled it out a bit on my WR by richening the fuel pilot jet a turn, and richening the main jet. It has helped but not cured it?

A search on surging will bring up a load of threads on jetting and the TPS etc.

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