Quote:

To determine if it's too rich or too lean at that RPM find a straight road with little traffic. Take the bike up to speed and hold it there for a minute or so. Then, without decreasing pull in the clutch and shut off the engine. Pull over and pull out your plugs and read them. This should give you a good idea of what you need to do.



With the fuels we use today this might give you an idea but very likley will not, my first guess is you are running out of fuel up there and need larger mains, if it does this in all gears that is likely gonna be your problem. Oops just read that in 4th gear it does not do this at those rpms? So in first sencond third and 4th is will run to the rev limiter?

2007 Speedmaster and miss it! 2013 T-Bird Storm and Luvin it! Catching a yellow jacket in your shirt at 70 mph can double your vocabulary