so you went up one and plugs are black then decided to go up another and same result. Perhaps you didn't even need to rejet at all.xci.ed6 said:Resurected because there are already some good tips in here, but I do have a question.
I'm trying to help a friend jet his Nighthawk 650 to the pods, we went up one step, and it stalls out when we take the choke off or when you try to rev it up. So we went up another step on the jets, same effect. Problem is the plugs are coming out jet black. It will idle forever with the choke on at least halfway. Is there anything else we should be checking?
floats aren't adjustable? Post a pic up of this. Anyway, plugs could be the culprit.xci.ed6 said:Stock jets it did the same thing, and Nighthawk forums says the bike runs lean stock.
I think something else is wrong, and I'm going to tear the carbs down to square one and start over. The floats aren't even adjustable on his carbs, so I'm not sure what I'm looking for.
I found that if I whack it wide open, it will rev up, but it does not like the midrange at all. Maybe I'll do a few ignition kill plug checks before I pull the carbs back off to get some better information.