T120 decat question for those who have done it themselves - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 22 (permalink) Old 06-13-2019, 06:25 AM Thread Starter
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T120 decat question for those who have done it themselves

I`m considering installing an x-pipe, have watched several of the videos posted on YouTube about the process but still on the fence if it is a job I can take on myself. I've read it can take up to 4 hours and the videos I've seen are 15-20 minutes so did you find any surprises lurking during the install? I'm not completely useless with a wrench but obviously don't want to have the bike pulled apart and discover I'm over my head. I've installed the sw-motech dresser bars so I already have experience with getting to the bolts holding the frame which seemed like the tricky part for some.

Just curious what peoples experience was. Thanks all!

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post #2 of 22 (permalink) Old 06-13-2019, 09:41 AM
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On my T120, this was a pretty straightforward job, but it took me a full day. I work slowly.

I just dropped the left lower frame cradle bar without removing it. It must be the left frame cradle, as the mount will only allow the cat to be removed to the left. Be careful of the side stand switch wiring harness, which can be disconnected to avoid damage from pulling.

I did remove the exhaust system, which made things easy to access. Be very careful with the exhaust system gaskets, which are delicate and easily damaged. You don't want to over twist or kink the wires to the O2 sensors on reinstallation. Since it takes five full turns to install each O2 sensor, I just twisted each sensor five turns CCW before screwing it back in. After installation, pull the insulating cover back a little to check that the wires are not twisted.

Carefully note how the clamps are installed on the the cat before removing them, especially the V-clamps. They must go back on in exactly the same way.

Each X-pipe out there installs differently. I went with the Tec offering because it fits perfectly and uses the original mount and hardware. You can retain the small stainless steel cat shield, if you like.

Bottom lines on the X-pipe: there's more sound and less weight. There's one heck of a lot less perceived engine heat. There's no engine remap required, no odd burbles or pops on decel, and fuel economy is not effected.
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Last edited by tsmgguy; 06-13-2019 at 10:18 AM.
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post #3 of 22 (permalink) Old 06-13-2019, 09:58 AM
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Pretty much the same experience as tsmgguy except I was concerned about too much twisting of the O2 sensors so I disconnected the exhaust at the head but supported and left the exhaust pipes hanging in place. Another thing to watch is not stressing the radiator mount when pulling out the lower frame cradle. You can remove that radiator mount but don't have to do that. Second the advice about being careful with the exhaust gaskets. The rear ones can be fun, depending on which decat you install.
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post #4 of 22 (permalink) Old 06-13-2019, 10:19 AM
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I installed a Meerkat x-pipe a few months ago. I'm very pleased with the product and the end result is fine but the installation procedure was extremely involved and was a big pain in the ass to me. (Please note that I'm not an experienced mechanic at all). The only surprises I encountered were first, one of the nuts used to tighten down the exhaust clamps had its threads crossed (I suspect that this happened at the factory) and second, when I finally got it all together, I discovered an exhaust leak due to a clamp being out of position when tightened down. Quite frankly, I'm not sure if I would go through that modification again. The bike sure sounds different but I liked the way it sounded before (I have Vance and Hines exhaust pipes) and whatever increase in power that may come from de-catting is very modest in my opinion. Also, you better plan on devoting more than 4 hours to the project. Watch as many videos on the subject as you can find, too.
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post #5 of 22 (permalink) Old 06-13-2019, 12:23 PM
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It took me all day too. I probably did a lot of stuff that wasn’t necessary. Make sure you have all the tools and torque settings. Getting to the frame bolt nut is not easy. Locate the nut first. Some people have slid the tank backward to access the nut. Try that first to see if you can access the nut before removing the tank. I disconnected the kickstand switch and pulled the cable completely down. I thought getting it back up would be a pain but it wasn’t. I removed the exhausts on both sides. Probably not necessary. Loosen everything first before you remove the exhaust. You don’t need to disassemble the passenger foot peg to remove it. Fold it up part way, stick a flat head screw driver into the allen head bolt to hold it while you loosen (or tighten) the nut on the back. Take pictures of the 4 clamps that hold the cat before you remove it so you can reposition them correctly when you install the x-pipe. Stay hydrated and good luck.
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post #6 of 22 (permalink) Old 06-13-2019, 12:35 PM
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Just undo the single radiator mounting bolt at the top. The radiator is now loose and can be removed from its mount. IIRC, you just lift the radiator up a bit and pull it forward a little to release. Once the radiator is loose, you can proceed with dropping the left lower frame cradle. The radiator doesn't weigh much and will just hang there, supported by the upper and lower coolant hoses.

The reason for removing the entire exhaust system was so that each component could be gently pulled straight off, minimizing the chances of gasket damage. I started with the mufflers and removed the pipes going forward. Reassembly is the reverse, with everything in position before any hardware is tightened. If any pipe is forced on at an angle, the associated mesh gasket will likely be ruined. Work carefully and be gentle. Bad gaskets will first be noticed by exhaust streaks from leaks at the joint.
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post #7 of 22 (permalink) Old 06-13-2019, 12:37 PM
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The upper left frame bolt nut is 7mm. Without moving the tank i was able to use a very short handled “stubby” wrench to hold the nut while turning the bolt. No need to remove header, just loosen it so no removing the O2 sensor. Most time was getting the cat free. It takes lots of coaxing but finally got it loose from right side and then down and out. Helps to have a third hand to hold the upper frame bolt while removing bolt. Patience and few breaks helps with frustration.
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Masquerading every day as a normal person is exhausting.
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post #8 of 22 (permalink) Old 06-13-2019, 04:32 PM
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Any exhaust stink from a decat?
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post #9 of 22 (permalink) Old 06-13-2019, 06:24 PM
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Quote:
Originally Posted by SpeedTwin_Lou View Post
Any exhaust stink from a decat?
Black streak.
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post #10 of 22 (permalink) Old 06-13-2019, 06:39 PM
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Quote:
Originally Posted by SpeedTwin_Lou View Post
Any exhaust stink from a decat?
No, none.
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