Stupid question about aftermarket exhaust muffler

Changnoi1

Ol'Timer
Nov 21, 2010
567
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I installed my Leo Vince slip-on muffler (that I bought for my Honda CB500F) on my Kawasaki Z250. And although I love the look and the sound (not sure what the rest of the mubaan thinks of it) but I have the feeling that I did lose power in the low-end.

Am I crazy or could I be right? This morning I did put back the stock muffler and my feelings seem to be confirmed. Later today I will try the Leo Vince muffler again on the same stretch of road and see if I really notice a difference or if it is just a feeling.
 

Changnoi1

Ol'Timer
Nov 21, 2010
567
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You mean like remapping the ECU? I did read that on older models of the Ninja 250 people would rejet the carb.

When refitting it I also saw that the slip-on was actually not good tightened to the header. I did put another clamp on it and tightened better.
 

Changnoi1

Ol'Timer
Nov 21, 2010
567
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Thanks for the info, still considering if I want to go that route ... just for a better looking & lighter muffler and a bit more sound (the latter is the only thing I appreciate safety-wise). But....

The header of the CB500F was I think 45mm, the header of the Z250 is I believe 38mm. Although I was told that the same muffler is sold for the Z250 and the CB500F I start to have my doubts about that.
 

mikerust

Ol'Timer
Nov 5, 2003
639
2
18
Have you tried it with the dB killer insert. CB500 comes with a 25mm outlet. Exhaust for Ninja also comes with 25mm outlet.

Might give you enough back pressure.
 

Changnoi1

Ol'Timer
Nov 21, 2010
567
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Yes, tried without dB killer first but now using the dB killer. With dB killers feels better indeed.