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Discussion Starter #1
I was stripping my fairings off today getting the bike ready to go get valve clearances checked and i noticed my bike has no o2 sensor how will this run without it is there a o2 elimator kit i should look for on my bike or does that mean my bike has been dyno tuned or does it have a power commander hidden somewhere.

Ive just bought the bike and have no history on it.

I thought it only had the slip on till i realised it has headers aswell. The headers have a o2 bung so im unsure why the o2 wasnt just installed into the new exhaust.
 

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No o2 sensor and full exhaustpipe is good combination when is bike is tuned. PC is plugged under the tank, the box itself can be anywhere. Rapidbikebox has own harness, the box can be taken off from it. Is the bike own box tunable, is it tuned? Look if something is plugged into o2 sensor's hole.
 

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Discussion Starter #4
Im unsure if its been tuned but i would say i highly doubt it. Ive got no history on the bike. Somebody probably just went out n bought a full exhaust n job done. Just a shame they put a two brothers on it. Dont really like it way to loud even with the silencer cap in it.
 

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I had same thing when I got my gsxr. But there was this mysterious usb-line under passenger seat. Turned out it was a rapidbox harness, the box itself was taken away before selling the bike.
I drove 1 summer without issues and got pcv on next winter. No worries there. In a long run u need some solution thou.
 

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... but by all means if u it worries you, get a lambda while figuring out what to do. Second-hand one's are almost cheap! 🙂
 

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Discussion Starter #9
Surely the exhaust doesnt make that much of a difference. Looking at photos of the factory headers they look very similar except for the butterfly valve but all in all looks like a decent flowing set of factory headers. I would of thought the slip on would make the biggest difference removing the cat convertor and that restrictive muffler replacing it with a straight through can. I just wouldnt of thought the exhaust would of made that much difference.
 

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Surely the exhaust doesnt make that much of a difference. Looking at photos of the factory headers they look very similar except for the butterfly valve but all in all looks like a decent flowing set of factory headers. I would of thought the slip on would make the biggest difference removing the cat convertor and that restrictive muffler replacing it with a straight through can. I just wouldnt of thought the exhaust would of made that much difference.
It's not he headers but the removal of the cat that you should get the bike tuned. For example on my K8, changing the exhaust does not eliminate the cat so no tune required.
 

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I think whatever u do, the bike wont mind. My angle is that now the pipe really doesn't make too much anything. I understood u think it sounds and looks bad.
It is designed to give power and it's probably bit lighter than original. If those mean not so much to u, my advice is; sell it and find and put cheaper second-hand original pipe back instead.
 

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Ex-Lady Supermod
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Definitely has no cat mate. Think the exhaust might of been like this for years without a tune.
Maybe but that doesn't mean it shouldn't be done. If you're going to get a new exhaust then wait otherwise you need to get it tuned as you are likely running lean.
 

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Discussion Starter #16
Yea i dont mind the note of it just to loud. And im warming up to the look of the exhaust. Not sure how long ill keep the bike for i want a 750 but after putting a few miles on this i might decide this is quick enough for what i want. Not sure what future will hold for the bike but im 100% sold on the comfort of this shape. Definitely like the bike.
 

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Discussion Starter #17
Yes i realise itll be running lean. Was just hoping it wouldnt be that lean that itd be dangerous. Is it worth me buying an older model power commander 2nd hand does it do just as good a job as the late model ones or is my ecu reflashable.
 

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Discussion Starter #18
Would running as higher octane as possible make my bike run abit safer. Ie 98 pump fuel
 

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Ex-Lady Supermod
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Yes i realise itll be running lean. Was just hoping it wouldnt be that lean that itd be dangerous. Is it worth me buying an older model power commander 2nd hand does it do just as good a job as the late model ones or is my ecu reflashable.
Nothing wrong with an older PC and you can run on a downloaded map till you get sorted. You might want to try different maps to see which works best. You can also flash the ecu but not nearly as good as a custom tune in my opinion. As for 2Bro's...













 

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Discussion Starter #20
Wow thats some impressive fireworks. Are the older pcs dyno tunable like can you put a custom tune on it and also can i skip the power commander and just reflash the factory ecu with a custom dyno tune
 
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