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F4i power loss new exhaust

Old 03-29-2017, 05:53 AM
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Join Date: Mar 2017
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Default F4i power loss new exhaust

Hello, just thought I'd post this on here and see if anyone had any answers

fitted some black widow SS exhaust headers due to the OEM corroding and since doing this I have noticed power loss at 5-7K rpm. It's as if the bike chokes and then kicks back in after 7k, I know this isn't normal because I can normally have the front wheel up at 5k in First. I am changing my air filter this week to see if that rectifies the problem but I find it strange how its happening just as my new exhaust headers are on. Any ideas?

FYI it's the 2001 f4i with only 18K miles.

Old 03-29-2017, 03:45 PM
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Join Date: Jul 2008
Location: Mesa AZ
Posts: 2,023

New headers aren't a good design it seems. Never heard of them, or headers corroding so I'm assuming your in England. What your describing is a bog and can either be a fueling issue or just a badly designed set of pipes. Air filter causing a problem is seriously doubtfull.
Old 04-01-2017, 01:28 PM
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Join Date: Apr 2017
Posts: 5


I bought my bike (2001 F4i) about 18 months ago with loads of paperwork.
Found out I had a "Sandy bikes" downpipe which is advised on forums to avoid because it`s badly designed. (No link pipes between the outer two and the very left one is in different angle).

Last December (2016) I bought a Motad SS downpipe which is designed as the copy of the original.
After I fitted it I had a lot more torque (power) around the 6k marks.

(Before I bought it I emailed Motad asking if they have any pipes for my bike and they offered one for 199 if I buy it within 10 days. It was a no brainer).
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