Bonneville T120 Exhaust Advice

Flashp · Jun 22, 2020

Keith Harris said: ↑

Further to my previous posts I bit the bullet on the 2020 Bonneville and purchased the British Customs Sleeper Pros and the Weslake X Pipe DeCat. Spent the rest of the day following the instructions, loosening all the relevant nuts and bolts and removing the catalytic converter and pea shooter exhausts. It took a few hours of fiddling, bending and checking stuff but I didnt have any real problems.

Started the bike up and let it run until the fan kicked in. Definitely noisier but a much richer, sweeter sound. I havent really been able to confirm performance etc as I have only done 600km on the bike so still running in. To be honest I dont know if there is a huge amount of difference. Time will tell when I can get out and run it properly. Bit of popping and noise on the overrun but nothing bad. I dont think the sound is too loud considering.

However and I will throw this out to the community. I have a couple of concerns.

1. It isn´t possible on the x-pipe to fit the heat shield. Don´t think this is a problem though.

2. Secondly and potentially a bigger problem is the exhausts. They are very close to the swing arm, especially on the left hand side where the exhaust is touching the swing arm. Sitting on the bike obviously depresses the suspension a bit then the exhausts have more space. But, getting off the bike then the left hand exhaust is touching the swing arm. I have tried taking the whole damn thing apart again, checking the installation but it all looks ok. I can use a little bit force and bend the exhaust out slightly but it eventually moves back again. I can only think that the problem may be with the x-pipe and that it is forcing that side of the exhaust system to bend slightly.

The next step is to put the original catalytic converter back on and see if this is still a problem. I mean the exhausts are made for T120 2017 onwards and I do not think there has been any major changes made to frame,exhausts etc that would cause this problem.

Have posted some photos and would welcome any input here.

cheers

Keith

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I think you're missing some brackets to get the heatshield back on. I can't comment on the rest of it but if it were me and things didn't fit without fudging I'd go back to the retailer with the problem.

They both look too close to the swingarm to me.

Keith Harris · Jun 22, 2020

Flashp said: ↑

I think you're missing some brackets to get the heatshield back on. I can't comment on the rest of it but if it were me and things didn't fit without fudging I'd go back to the retailer with the problem.

They both look too close to the swingarm to me.
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Apparently the Weslake x-pipe dispenses with the heat shield according to the blurb. Now I just have to find out why the exhausts are too close to the swing arm. I also found a thread on the Triumph Rat forum by riders with exactly the same problem with the clearance. According to BC there should be 3/8ths inch clearance but on the RHS the clearance is about 3mm and on the LHS no clearance without sitting on the bike or stressing the exhaust fitments . I might try bending the OEM bracket slightly and remount the exhaust.

Keith

Brixton Steve · Jun 29, 2020

Keith Harris said: ↑

Hi Guys,

Lots of good stuff to mull over here. One other thing..... A lot of people complained about the rear shocks and front springs on the earlier Bonnevilles (2016 - 2018). Has there been any improvement to the suspension on the latest T120s?
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Got a '19 T120 wasnt impressed with suspension back or front. Have now fitted Hagon 2810s on rear and their Progressive springs on front end. Wow, what a difference, handling improved greatly as has comfort. The wife a lot happier on the back to. Definitely worth it.

FatLadsRacing · Jul 4, 2020

Brixton Steve
Good to hear re Hagons. My next purchase me thinks, along with right pipes.

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