High speed sputter....

[tkarvelis]

Thanks for your help. I still wonder if I am running n lean. I plan to purchase a tach and adjust the high speed needle until I notice a drop in rpm on the rich side, and see where that falls and how much of a change from stock. There is still the thought that I could have a clog in the high speed circuit, preventing proper fuel ratio.

I am not going to blow the engine...

 

[Sportster-2001-951C-Stock]

Seems like it's doing pretty well, was just surprised the insulators hadn't picked up more brown color by now.

Maybe you can keep an eye on piston wash, I haven't been watching wash on mine but it's a better indicator than plug insulator color. What you want to see is around 1/4 inch ring of bare aluminum, the three cylinder here is after 50hours and well into the safely rich zone.