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| Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler. |
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10-10-2008, 09:50 PM
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#1 (permalink)
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Member
Super Sidecars Favourite Bike: 2003 Bonnevile T100
Join Date: Sep 2008
Location: Portland, OR & Orcas Island, WA
Posts: 55 Other Motorcycle: 1970 cb350, 1974 cb360
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Cutting the header on a Bonneville
I don't know if everyone hates the header "kink" as much as I do, but my bonnie sure would look a lot cleaner without it. I'm considering cutting the bend out of the header and throwing the Dunstall mufflers on. From what I can tell, you get about 3/4" of straight pipe before running into the header attachment points. I was thinking of modifying (aka cuttin' off the tip) of my dunstalls to allow a tight fit to the header. Has anyone tried this?
I know you can buy new straight headers, but I don't have that kind of cash currently.
Thoughts?
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10-11-2008, 01:03 AM
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#2 (permalink)
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Senior Member
Moto Grand Prix Favourite Bike: '03 T-100 & '08Tiger1050
Join Date: Aug 2004
Location: Stroud, OKlahoma, USA
Posts: 3,196
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You may run into clearance problems with the stock header without the kink. The aftermarket "straight" headers that I have seen are routed a little differently.
Have em ceramic coated black or paint em black with high temp BBQ paint and you won't even notice the kink, anymore. 
__________________
Larry
2003 T-100 (790cc), NARK, NH Togas, 8100 rpm rev limiter, 158 main jets, 42 pilot jets (less than 1 turn out on pilot screws), stock needles--no shims. 13 A/F ratio from 1100 rpm to 4000 rpm; 12 A/F ratio from 4000 rpm to 6000 rpm; 13 A/F from 6000 rpm to 8100 rpm.:D
2007 Tiger 1050--White:D--SW-Motech crashbars, Skidmarx rear hugger/chain guard, Calsci +7 windscreen.
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10-11-2008, 02:45 AM
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#3 (permalink)
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Senior Member
Team Owner Favourite Bike: 04 Bonnie black
Join Date: Dec 2004
Location: Tacoma,WA
Posts: 4,495
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Larry is right,the "kink" is there to allow sidestand retraction.You can get around the problem with a modified 2into1 pipe,but we all know how much "those" suck.
__________________
Ruining a perfectly good Bonnie since 2004.
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10-18-2008, 11:30 PM
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#4 (permalink)
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Member
Super Sidecars Favourite Bike: 2003 Bonnevile T100
Join Date: Sep 2008
Location: Portland, OR & Orcas Island, WA
Posts: 55 Other Motorcycle: 1970 cb350, 1974 cb360
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Just put some dunstall replicas on my bonnie. First off they sound great! Actually not super loud.
Secondly, I minimized the kink in the headers by cutting off part of the header and cutting down the adapter pipe. I'll upload photos soon.
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10-19-2008, 12:26 AM
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#5 (permalink)
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Senior Member
Team Owner Favourite Bike: 04 Bonnie black
Join Date: Dec 2004
Location: Tacoma,WA
Posts: 4,495
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Cool. I went the other way,removing all the straight pipe and adding kinks.
__________________
Ruining a perfectly good Bonnie since 2004.
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10-19-2008, 05:29 AM
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#6 (permalink)
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Member
Super Sidecars Favourite Bike: 2003 Bonnevile T100
Join Date: Sep 2008
Location: Portland, OR & Orcas Island, WA
Posts: 55 Other Motorcycle: 1970 cb350, 1974 cb360
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nice. Did you make it or just cut things up?
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10-19-2008, 06:13 AM
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#7 (permalink)
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Senior Member
Team Owner Favourite Bike: 04 Bonnie black
Join Date: Dec 2004
Location: Tacoma,WA
Posts: 4,495
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I made the pipe myself. Its bits of stock header,and pieces of u-bend and 2"pipe that was left over from some of my other pipe experiments.Its pretty quiet and has very nice power up and down the throttle. The Dunstall cans I`ve seen and heard,have been darn good too. You`ll be happy with them.
__________________
Ruining a perfectly good Bonnie since 2004.
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10-25-2008, 02:43 PM
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#8 (permalink)
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Member
Super Sidecars Favourite Bike: 2003 Bonnevile T100
Join Date: Sep 2008
Location: Portland, OR & Orcas Island, WA
Posts: 55 Other Motorcycle: 1970 cb350, 1974 cb360
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pic
Quote:
Originally Posted by disco4u
Just put some dunstall replicas on my bonnie. First off they sound great! Actually not super loud.
Secondly, I minimized the kink in the headers by cutting off part of the header and cutting down the adapter pipe. I'll upload photos soon.
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Picture is here http://picasaweb.google.com/DcMadsen...47599401625842
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10-25-2008, 03:12 PM
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#9 (permalink)
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Senior Member
Powerbike Favourite Bike: Bonneville Black
Join Date: Dec 2007
Location: Brittany, France
Posts: 334 Other Motorcycle: why? eh? WHY?!! Extra Motorcycle: Imaginary Bonnie bobber
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Quote:
Originally Posted by rodburner
Cool. I went the other way,removing all the straight pipe and adding kinks.
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That is a tidy bike!
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10-25-2008, 03:15 PM
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#10 (permalink)
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Member
Super Sidecars Favourite Bike: 2003 Bonnevile T100
Join Date: Sep 2008
Location: Portland, OR & Orcas Island, WA
Posts: 55 Other Motorcycle: 1970 cb350, 1974 cb360
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Anyone know the "how to" post pics on the forum? I can't post directly....
Last edited by disco4u; 10-25-2008 at 03:22 PM.
Reason: pic won't come up
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