flat spot

[lacos]

hi all just joined the site i have a 99 zxr 400 l5 it runs sweet apart from a nasty flat spot at 3700-4000 witch is really annoying in town it was set up by a main dealer but dont think they did it properly she is making 61 hp witch is good and the af ratio is 12.8 for most of the rev range apart from the flat spot were it runs rich af is 10 can any one help cheers

[Mori Man]

What zorst you got ?

Some systems produce a flat spot in their design that you can't get round.

If everything else is sweet you just got to live with it.

[lacos]

hi mate is got a scorpion end can and think your right mate its not so much an issue now i am used to it like i said is all sweet above 4000 cheers