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Old November 21st, 2017, 10:24 AM   #7
DannoXYZ
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Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C

Posts: A lot.
MOTY - 2018, MOTM - Nov '17
Quote:
Originally Posted by Darksik View Post
I put the same exhaust on my bike, also with the Akrapovic decal, but something I note is that the Ninja lost some power, because with the stock exhaust, the bike could pass the 100km without any problem, and now if I want to pass the 100km I need to accelerate a little more
What RPM-range are you using to accelerate?

Given the larger diameter tubing and shorter length, I suspect this muffler would enhance high-RPM flow, but may lose some mid-range. Similar to what happened with the Tyga when I installed it. This makes the lean low-end worse, while matching the too-rich factory top-end perfectly. I got a 5-8% power-increase with no re-jetting needed. Off-idle and mid-range had more stumbling. I added more low-end fuel by turning out pilot-screws 0.5 turns.
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