Hi Deejay
I ended trying powered form of graphite to lubricate the roller axel. Finally got some pictures. The H30 runs real well above idle; but not idle. I have dismantled the carbie several times & can't see any issues. The plug looks to be running rich; I have tried various changes to idle & main jets screws. Got any suggestions?

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Masport 2.jpg (904.44 KB, 155 downloads)
Masport 3.jpg (993.66 KB, 136 downloads)