Rough idle 2016 T120 Bonneville - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 12 (permalink) Old 09-07-2019, 08:04 PM Thread Starter
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Rough idle 2016 T120 Bonneville

This is my first post on the forum, hello everybody!

I just got a new (to me) 2016 T120 Black w/ the gunmetal gas tank.

Bike is in great shape, has 4,300 miles on it, but it seems to have a bit of a rough idle. RPMs bounce up and down a bit (probably a 200-350rpm difference when bouncing in most cases), both when cold and when hot. I thought maybe it would be the gas as the bike hasn't been ridden a lot in the past few months, but after putting in new gas as well as fuel injector cleaning solution, the problem persists. It's worth a mention that there seems to be a bit of backfiring going on as well. The backfiring doesn't seem to be constant, but does regularly occur.

While there is no CEL on on the bike, there are 2 trouble codes that the bike gives me when I put a code reader to it (which is very odd, considering the CEL illuminates upon ignition on, just like it should, to make sure the light works). Codes are P0131 and P0151.

The codes are for both bank O2 sensors circuit low voltage. I have a hard time believing that both of the O2 sensors are bad, but this is my only clue as to what could be going on with the bike.

Any help at all would be appreciated!!
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post #2 of 12 (permalink) Old 09-07-2019, 09:37 PM
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If your CEL isn't lit then these are probably old codes, maybe the O2 sensors have been disconnected at some point.
What mods does the bike have, my TTR has X pipe and vance and hines and idles enevenlly like yours, and load's of pop's on the overrun 😀
Just clear the codes and see if they return, my guess is they won't.

Last edited by Scottty; 09-07-2019 at 09:41 PM.
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post #3 of 12 (permalink) Old 09-07-2019, 09:45 PM Thread Starter
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As far as I know, the bike has no mods besides the fact that the pea shooters were taken off. I didn't get them in sale unfortunately, and have a set of them coming in on Monday.

I can take a video if it would be helpful of how it is acting. I don't have a whole lot of motorcycle experience under my belt (owned a KTM Duke before), but am very familiar with cars and their mechanics.
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post #4 of 12 (permalink) Old 09-07-2019, 09:55 PM
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Check underneath to see if it's decatted, it's well hidden, didn't realise that mine was until I got it home, dealer had no idea.
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post #5 of 12 (permalink) Old 09-07-2019, 10:45 PM Thread Starter
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Ok just checked - cats are there. However, when down there I did notice a bit of a leak unfortunately. I attached pictures of it.

First picture is to show you what area I'm looking at. Second shows it a bit closer, you can clearly see what appears to be a drop of engine oil - a fresh leak. And then the third is a bit closer up near that electrical plug thing. Not sure what it is, but it *kind of* looks like the culprit of the leak.

Any ideas to either the idle or the leak? I'll need to put some more oil in it in order to take a video in a day or two of the idle. Also, what is that electrical plug thing in the picture?

It's pretty dirty down there, but the metal is in good shape. Is it safe to use brake clean in this area? I could clean it up and drive it a few miles to see maybe where the leak is for sure coming from.
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post #6 of 12 (permalink) Old 09-08-2019, 04:15 AM
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Firstly I'd give the area a really good clean with paraffin or brake cleaner to determine whether there is an actual leak or it's just an accumulation of chain lube, I think that's the gear position sensor in the picture, if worse comes to worst it'll probably just need an o-ring.
Is the oil level actually low, don't just assume it needs oil because you think there's a leak definitely check.
Clean it up and refit the covers and then run it for a bit and have another look, that's the sort of thing you should really spot when you're cleaning your bike.
As far as the rough idling goes, if the bike is running ok otherwise then I wouldn't worry about it too much.
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Last edited by Scottty; 09-08-2019 at 04:17 AM.
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post #7 of 12 (permalink) Old 09-08-2019, 01:00 PM Thread Starter
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Ok just cleaned up the area really well. I'll attach some photos. That one drop on the side of the second photo above really looks like oil to me, but after inspecting the oil level after running it and then shutting it off and waiting for about 4 minutes on the center stand, the oil level is within the threshold it should be. I'll probably do an oil change soon enough, but I want to make sure I take care of this "leak", if it is leaking. I found the O-ring online, with help of other threads on here, and I'll keep this thread updated about it.

I've put below links to videos of the bike. The first is a cold start, where you can see the RPMs bob up and down a bit, but besides that, nothing seems too unusual.

The second video was taken a little after the first one, and you can hear it start to backfire, as well as the RPMs bobbing around a bit lower than in the first video. The little "taps" aren't me hitting the phone, it is the engine backfiring I believe. When I take it around the block, they'll happen more often when idling and when riding. My last bike would have a bit of popping when coming off of the throttle, but obviously when idling I'm not giving it any extra fuel.

Before filming these videos I cleared the P0151 and P0131 codes. Didn't seem to have any effect on how the bike ran.

I may just not be used to this bikes/bikes in general, as well as the fact that it has no exhaust. Please let me know what you think!


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post #8 of 12 (permalink) Old 09-08-2019, 02:04 PM
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Looks like my idle. I don’t hear popping. Put mufflers on and reaccess.
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post #9 of 12 (permalink) Old 09-09-2019, 06:28 AM
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My idle is the same on Speed Twin.
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post #10 of 12 (permalink) Old 09-09-2019, 09:13 AM
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Everything looks and sounds entirely normal to me. Sounds exactly like you'd expect for a T120 with no mufflers.

Photo: Ducati GT1000 at Utah's Bonneville Salt Flats
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