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What is this sensor for? (not stock)

4K views 22 replies 14 participants last post by  grover 
#1 ·
I bought a new to me 2013 Summit 800 XM ETEC recently and obviously didn't look it over well enough because once I got it home and popped the hood off I found this:

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Any idea what it is? It's obviously not stock considering the booger-weld job they did on the pipe. Thanks!
 
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#2 ·
There was a wideband sensor installed. The sensor was removed and plugged with an automotive oxygen sensor.
 
#3 ·
So... was there a turbo on here at one point or is this just a device to watch AFR? Seems pointless to watch AFR without it feeding back into some type of EFI controller. Pardon my lack of knowledge on the subject... this is my first mountain sled. I've been a flatlander for the last 20 years. :wink_old:
 
#5 ·
Yikes, Most people don't install AFR bungs and sensors into stock sleds, leads you to believe the sled was modified at one point like a turbo? hope your motor didn't see boost.
yeah, me too... I had a few CELs that cleared right away on my last trip to Wyoming. I also had trouble maintaining RPM but the clutch is probably beat and due for a rebuild if it had a turbo. I got it with 1,369 miles on it, there's around 1,600 on it now.
 
#12 ·
IMO: that sensor was just used as a plug for an O2 sensor /AFR gauge that was used "close to stock." Any decent turbo install puts the O2 sensor DOWNstream from the turbo. I'd say: 1: someone was extra curious what kind of AFRs they were getting, or 2: they had a PCV on there, and needed an afr for tuning. I highly doubt there was a turbo on there.
 
#13 · (Edited by Moderator)
check these pictures. 2013 does not have sensor in exhaust like a 2015
My sled definitely has 2 stock EGT sensors (one in the pipe, one in the muffler) still in place plus the mystery sensor that isn't hooked up to anything. If you look in the upper right corner of the parts fiche for the exhaust on the 2013 is shows a "double thermocouple module" in a separate window. It's only on the Summits and the Renegade Backcountry apparently.

freeride600, on 07 Apr 2017 - 8:58 PM, said:

IMO: that sensor was just used as a plug for an O2 sensor /AFR gauge that was used "close to stock." Any decent turbo install puts the O2 sensor DOWNstream from the turbo. I'd say: 1: someone was extra curious what kind of AFRs they were getting, or 2: they had a PCV on there, and needed an afr for tuning. I highly doubt there was a turbo on there.
What's a PCV?
 
#15 ·
That is definitely a lambda sensor. Why they cut it off there I have no idea though.
 
#19 ·
Was the pipe original to the sled?? May be a pipe from another sled that was damaged. Could have a parts special there. Take parts from 3 sleds, build and sell 2 of them, then sell parts that are left over. Haydays is full of them.

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#21 ·
There was a wideband sensor installed. The sensor was removed and plugged with an automotive oxygen sensor.
That is my guess too. I would leave it the way it is with some copper anti-seize or get a set of plugs from Koso. Then weld a new bung to the inside bend in a 10-11 o'clock position. Helps to keep a two stroke live longer.
 
#22 · (Edited by Moderator)
That looks like the one on my 13 sled.

AEM, afr gage. I love it.

Put er' back in to fill the hole, tighten er' down. It won't hurt fak-all. :ride:

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