TOPIC:

Anyone have a problem with a flat spot at mid rpm wot after installing a header?Could it be the baffle size or lack of? I heard some old pipes did this.So Im wondering if my flat spot may be my Kerker.I had it with my vm29's,and still with my 33's.

except for in two strokes I have never had a header induced flatspot...it has aways been carbs...are your carbs set to spec?

someone else chime in but thats just my experience

I have had Kerkers on 2 different KZ650s and never had any trouble. One had pods and the other didn't.

I had a flat spot around 5grand with my Supertrapp exhaust - when its dialed in for HP, and lower backpressure that is.

Once I tuned it down to increase low-end torque, it went away.

I thought the smooth bore carbs work more like an on/off switch(well maybe not that extreme).

When I got the bike(25years ago)it had no baffle and vm29's.Then I put in bigger intakes,and vm33's.same flat spot.I just fabbed up a baffle and the flat spot is still there but it moved down in rpm.I'm just not sure if it move down due to the baffle or carb jetting changes ? I'll have to try pulling the baffle again next spring and see what happens.

pyxen wrote:

I had a flat spot around 5grand with my Supertrapp exhaust - when its dialed in for HP, and lower backpressure that is.

Once I tuned it down to increase low-end torque, it went away.

can you explain how you dialed it in.Im not formilar with supertraps.

Corey,what do you mean by "I thought the smooth bore carbs work more like an on/off switch(well maybe not that extreme)."

Not just "up-ing my post count, but there was something a little bit back where someone had added those to their bike, and had the on/off switch ridability. I might be wrong, and someone please correct me if I am. Ask Wiredgeorge, as he seems to be the Carb King.

tinyurl.com/ea6n

I havent heard that one before.It does make sence that they may move the power band up a little.But you also get a lot more power.