Fuel woes and fixes - Wrist Twisters
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post #1 of 2 Old 05-23-2016, 06:32 PM Thread Starter
Join Date: May 2011
Location: Texas
Posts: 29
Rep Power: 1
Fuel woes and fixes

Hi all.
Picked up a 2007 niner about 5 or 6 mos ago. My second 919 and I bought it since it was a know quantity, after weighing a vfr 1200 and other large displacement sport / touring / old man bikes.
I love these bikes and the price was right.
Lots of standard maintenance done immediately. Synthetic oil and filter, new chain and sprockets, new ebc pads front and back, Ken air filter and iridium spark plugs. well, in short, I was still experiencing a lag or stutter at low rpms, especially noticeable on my commute to work (low throttle, low speed, low rpm).
Thanks to the wealth of knowledge found on this forum I suspected the fuel pressure regulator. A quick swap with a new one and I was feeling fine. But now I was getting a lot of carbon spray and pop from exhaust. Literally misting my garage door with carbon when I launched out of the driveway on my way to work.
I assumed the two brothers can was a single sided slip on (with mid pipe) to stock headers.
I Picked up a pciii from a forum member here, installed and synced a dynojet map.
Tried the stock map and the two brothers map... Both were starving for fuel at low rpms. Maybe I installed it wrong?
So I loaded the zero map from Dyne jet. All good, back to normal. But there's no sense in a zero map with a power commander. So again, thanks to the wealth of knowledge and experience found here I downloaded the map files.
Loaded up the 900rr headet, custom slip on, high - flow air filter map and it's feeling good.

I'll give it a few longer rides before passing judgment but I think I found her stride.

Just a long way of saying thanks for the knowledge here which I'm sure has come with no small amount of consternation.

catdaddy512 is offline  
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post #2 of 2 Old 05-23-2016, 06:51 PM
oops hurts
theboom's Avatar
Join Date: Sep 2015
Posts: 404
Rep Power: 1
I had to do the fuel pump and filter. It sucks but I had rust in the tank. The pressure regulator is a common culprit tho. But the pcIII wasnt really going to help you have a fuel line problem not likely an FI problem

theboom is offline  

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