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Discussion Starter #1
I'm going to get my ecu reflashed for my sf 848, so my question is about the o2 sensor. Do I leave it in or eliminate it? And what are the benefits of eliminating it? They said if they eliminate it they would be able to control the low end more, since the ecu uses the o2 sensor to adjust the fuel, just some of your thoughts?
 

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I'm pretty sure the system is closed loop, so it has its own map of parameters and if you alter the fueling map, it will for sure try to compensate and bring the fueling into the 02 map range. So yea, eliminating the 02 sensor entirely is the right idea, there are no consequences what so ever.
 

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If you ever do any mods that mess with your A/F ratio, Exhuast, Air Filter etc the only way for you to adjust the map below 3-4k is to have the O2 sesors bypassed. Have them also remove the exhaust valve and you can take out the exhaust valve motor.

I put on a Comp Werkes exhaust on my Monster 1100 and I got a lot of popping and some backfiring even after an ECU reflash. I wound up getting a Bazzaz ZFI with an autotune. The sensor showed the bike was running really lean down low, I believe ~15 AFR in the low RPMS at small throttle openings. Because the reflash removed the O2 sensors the Bazzaz was able to adjust fueling below the 3k range. After this the bike ran so much smoother and the throttle felt fuller. Def one of the better mods for fueling issues.
 

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Discussion Starter #7
I decided to send it out for a reflash. I hate to say it but I'm not sure where is it. I thought it was under the battery compartment, but how do I get to it? From under the seat? How do I take the seat off?
 

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I decided to send it out for a reflash. I hate to say it but I'm not sure where is it. I thought it was under the battery compartment, but how do I get to it? From under the seat? How do I take the seat off?

I'd like to discourage you from taking the ECU out if removing the seat seems like a difficult task to you.
 

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Discussion Starter #9
Ha ha I was looking for the screws on the sides like my gsxrs, I found them in the back, but thanks for your help! I am very capable just unfamiliar with the bike.
 

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^Surf steps are as followed.
1. Key to the bottom left tail cover :D
2. Take the plate off after u take the seat cover off
3. Take front seat off
4. remove the battery
5. disconnect ECU connectors (flat screw driver to push onto the tab and rotate the tabs until the connectors pop off the ECU themselves. DO NOT FORCE the connectors if you didn't completely rotated them towards the middle of the 2)
5. Take the fuse boxes out (the bracket holding all should slide out easily on the longer fuse box. The shorter one requires a little tab pushing
6. Straight forward from here...disconnect the ECU's screws and the ground wire
Voila
Upon reinstalling the ECU, make sure your ground wire is tightened up against the ECUs, or ur bike won't start and throw you an error code CAN..Ask me how I know :p
 

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Discussion Starter #11
Thanks brother once I got the seat off, only took a few minutes last night and gonna ship it out this afternoon
 
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