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Old 06-27-2013, 07:45 PM   #1 (permalink)
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New Bonneville lower frame removal

A search didn't yield anything on this...Just picked up a '13 SE I have big plans for...

So here's a question for y'all:

Anyone removed the lower frame member on the Bonneville chassis?

I was browsing Mule's website, specifically their 2:1 exhaust. He feels the lower frame member is really just there for nostalgic cosmetics and designed a full exhaust that is able to get tucked up higher and offer a much better flowing set of primary tubes. Sheds some weight, offers better performance and better clearance, seems like a win-win. Thoughts?


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Old 06-28-2013, 12:21 PM   #2 (permalink)
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Ok, I'll be more specific. The lower frame member is bolted to the main frame in the following 3 locations.

Top of the down tubes:
New Bonneville lower frame removal-imageuploadedbymo-free1372432555.161133.jpg

Front engine motor mount:
New Bonneville lower frame removal-imageuploadedbymo-free1372432582.192172.jpg

Behind the mid controls:
New Bonneville lower frame removal-imageuploadedbymo-free1372432615.524505.jpg

It certainly doesn't appear that the nature of these connections provides anything significant in terms of structure, particularly the junction behind the mid controls. That is simply a tab which extends below the frame and has a couple of 5/16" or metric equivalent bolts holding it together. It looks like the motor mounts which the motor is suspended from should do an adequate job without the lower front mount in place.

Anyone have any additional thoughts on this? Anything I'm overlooking?


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Old 06-28-2013, 12:53 PM   #3 (permalink)
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Don't listen to me cause I'm not a expert. But when I bought my 06 Scram in 2008 (from the dealer). The mechanic said that part of the frame was there for aesthetics and to hold some minor stuff on and the main part of the frame is above the motor and that's why the bikes are so much lighter than the older ones. This mechanic has been working on Triumphs BSAs and Nortons for the past 30 plus years. You may want to try to contact someone at Triumph and not just a dealer for the advice you're looking for.


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Old 06-28-2013, 01:19 PM   #4 (permalink)
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Quote:
Originally Posted by ArticRubi View Post
A search didn't yield anything on this...Just picked up a '13 SE I have big plans for...

So here's a question for y'all:

Anyone removed the lower frame member on the Bonneville chassis?

I was browsing Mule's website, specifically their 2:1 exhaust. He feels the lower frame member is really just there for nostalgic cosmetics and designed a full exhaust that is able to get tucked up higher and offer a much better flowing set of primary tubes. Sheds some weight, offers better performance and better clearance, seems like a win-win. Thoughts?


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Plus I don't understand how making an exhaust that is a couple inches closer to the motor will increase exhaust flow and if you are losing weight from taking off that part of the frame you aren't losing much weight. There are way better ways of losing weight and increasing performance than that.


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Old 06-28-2013, 01:27 PM   #5 (permalink)
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I just checked out that exhaust system. Looks like you'd have to spend a couple extra buck on a new oil cooler and the hoses that go with it. And looks like there is a new part of the frame that holds the new oil cooler and one motor mount. I don't see why this couldn't be done if you have the dough to spend.


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Old 06-28-2013, 01:55 PM   #6 (permalink)
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Yeah I see what he did with the oil cooler. That's too much coin for that! However, I could very easily fabricate one myself. My thought would be to run his 2:1 exhaust since its not actually that expensive - comparatively - and build the front frame section myself. Chances are it won't be as clean as his design but I have a t00b bender I use for chassis fabrication - the rest is just building, welding, and making up some AN oil lines.


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Old 06-28-2013, 02:06 PM   #7 (permalink)
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Old 06-28-2013, 02:28 PM   #8 (permalink)
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Good point, Mule makes one for the frame delete, pretty short money for his parts too...


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Old 06-28-2013, 05:48 PM   #9 (permalink)
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ArticRubi why don't you get the Arrow 2 into 1? It's stainless and I'm sure it weighs a lot less than the stock one and its only a few hundred more than the Mule one, plus it would save you the headache of removing that part of the frame and building an oil cooler. I think I could answer my question. Everyone has the Arrow that Mule one would be one of kind (sort of) and with a different oil cooler and that part of the frame off the bike, it would look pretty sweet.
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Old 06-28-2013, 06:32 PM   #10 (permalink)
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Lol! Yep, answered your own question!


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