'12 Bonneville SE, O2 Sensors and Brake Master Cylinder - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 15 (permalink) Old 08-13-2019, 09:42 PM Thread Starter
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'12 Bonneville SE, O2 Sensors and Brake Master Cylinder

Hello All. First bike. First post. Happy to be here!

I bought a 2012 Bonneville SE with 1100 miles from a private seller on Craigslist. The seller was a "friend" of the owner and showed up with all the paperwork pre-signed by the actual owner. I was able to register and title the bike, so, not thinking too hard about all that anymore. The bummer is that during the test ride I swear the check engine light wasn't on, but, as soon as I paid the guy and started home the check engine light came on. Great. So, I bought the bike on Saturday put 5 miles on it, and then Sunday I drove it to Triumph of Brooklyn dealership to see what I got myself into.

Service department opened today, Tuesday. They called me this morning and recommended an annual service (apparently a glorified oil change) since it had no service history. $343. (Parts $76 + Labor 1.5 hours $252 + Tax) Fine, I'll do the next oil change myself, but, what I was really paying them for was the diagnostics and inspection.

Diagnostics revealed the check engine light to be a need for (2) O2 sensors T2204061 (Parts $273 x 2 + Labor 1.5 hours x 2 = $1,050).

Their inspection revealed that the front brake felt "wooden" so they also recommended a new front brake master cylinder T2026221 ($99 parts + 0.5 hrs labor = $183).

They said O2 sensors were an emissions thing, not a safety thing, and that if I didn't mind the brake feel then I could do both fixes at my leisure so I passed.

Question for you guys is, if I'm confident with my tools and I can read a Haynes manual, any reason not to do this stuff myself?

Where do you guys recommend I source parts? They said the bike was too new for a rebuild kit for the front brake master cylinder and that Triumph would only sell them a brand new one so they recommended that I source one from eBay. For the O2 sensors they gave me no leads.

Thanks for all your help guys!! c
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post #2 of 15 (permalink) Old 08-13-2019, 10:43 PM
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I’d start by flushing the brake fluid, cleaning the caliper (including a little fine sanding of the pins) and new brake pads and that very well might take the “wooden” feeling away on those front brakes. Check the pad depth on your rear at the same time. Not sure if you can find a better price on the O2 sensors but looking at my Haynes manual, they look fairly easy to replace. A little time but a lot of savings is yours to be had. Good luck with it. Nice looking bike!!
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post #3 of 15 (permalink) Old 08-14-2019, 03:19 AM
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Your bike is 7 years old, so not sure what they mean by 'new'?

This master cylinder repair kit is apparently compatible, but someone with more knowledge should confirm. (Honda repair kit)

https://www.ebay.co.uk/itm/361639814268

There is an aftermarket mod which bypasses the o2 sensors. A search on here should give you all the info.

Your garage service prices seem a little crazy ? Good luck.

Born to be mild
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post #4 of 15 (permalink) Old 09-01-2019, 11:56 AM
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You can test and replace the 02 sensors yourself. Here's my video on the process:

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post #5 of 15 (permalink) Old 09-01-2019, 12:27 PM
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You might consider new tires if it still has the original tires. They're quite old by now, for motorcycle tires.

Marty
2005 Bonneville Blue 790cc, AI removed, Staintunes RC, no snorkel, inlet enlarged, 118/40/NBZT needles/1 shim/3 turns, Ikon 7610s, Ricor Intiminators, Barnett green clutch springs, Michelin Pilot Activs, D9 gauge panel, tachometer.
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post #6 of 15 (permalink) Old 09-01-2019, 01:14 PM
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Dealer prices are generally outrageous, and the results often uncertain. All the help & info is available on this forum either through Google searches, or fully explained questions for anything needed on these simple great bikes.

I'm on my second carbed Bonnie, with a Haynes and perhaps a hundred bucks in crap tools and despite not being a mechanic I've never taken either bike to the dealer.

These bikes are tough, bullet proof, and have a rewardingly simple design. Likely your bike has simply been neglected, both mine were, but it takes little to bring them to spot on.

For parts I go to Hermy's, fast shipping and great phone support. If you want to trust your bike up in the 80's and 90's while in two lane twisties, do the work yourself.

'02 Bonneville - AI removed, 152MJ's, 42's 1.5 turns out, Air Box Gone/Uni Filters, TPS removed/capped, NH Togas, Nology Coil, Hotwire plug wires, TTP SafeStart, TTP Firestarter, D9 Bracket, Pingel petcock, 19 tooth sprocket, Michelin Pilot Actives.
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post #7 of 15 (permalink) Old 09-01-2019, 06:01 PM Thread Starter
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Quote:
Originally Posted by cajunbonnie View Post
I’d start by flushing the brake fluid, cleaning the caliper (including a little fine sanding of the pins) and new brake pads and that very well might take the “wooden” feeling away on those front brakes. Check the pad depth on your rear at the same time. Not sure if you can find a better price on the O2 sensors but looking at my Haynes manual, they look fairly easy to replace. A little time but a lot of savings is yours to be had. Good luck with it. Nice looking bike!!
Thanks for the advice! I got my Haynes manual a week or two back. Been studying it. Going to give it a shot in the fall/winter.
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post #8 of 15 (permalink) Old 09-01-2019, 06:04 PM Thread Starter
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Quote:
Originally Posted by mick 85 View Post
Your bike is 7 years old, so not sure what they mean by 'new'?
The mechanic was saying that when they get to around ten years old Triumph put out a repair kit for the brake master cylinder but that currently Triumph only sell new master cylinders for the '12 Bonnevilles.

Quote:
Originally Posted by mick 85 View Post
There is an aftermarket mod which bypasses the o2 sensors. A search on here should give you all the info.
Will check that out. Thanks!

Last edited by chadstone30; 09-01-2019 at 06:07 PM.
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post #9 of 15 (permalink) Old 09-01-2019, 06:06 PM Thread Starter
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Quote:
Originally Posted by johnpainter View Post
You can test and replace the 02 sensors yourself. Here's my video on the process...https://youtu.be/oDan2q9Q7Gc
Thanks! Super helpful!!
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post #10 of 15 (permalink) Old 09-01-2019, 06:08 PM Thread Starter
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Quote:
Originally Posted by Baltobonneville View Post
You might consider new tires if it still has the original tires. They're quite old by now, for motorcycle tires.
They look ok to me, but honestly I can't tell. What am I looking for? Signs of dry rot? Cracks and whatnot?
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