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PostPosted: Thu Aug 17, 2017 12:54 pm 
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Joined: Fri Jun 19, 2015 5:14 am
Posts: 255
Country: USA
Bikes owned: T500
some of you may remember my T500 café build. I have less than 100 miles on the bike. It had a brand-new Higgspeed stainless chambers. after this short amount of time, the right mount has cracked and pulled away from the chamber. There is also a split in the chamber as well on that side. I contacted David Higgs from Higgspeed, and he has offered to repair and brace it, but that involves shipping it back to England which will cost a small Fortune. There is a local guy who does pretty good at work that I found for $70 per hour shop rate, I could probably have it fixed here cheaper.

My questions are, should I simply bite the bullet and return to Higgspeed to have him fix it? should I devise some sort of soft mount for the rear chamber mounting spots to alleviate some of the stress? pictures and/or descriptions of ideas would be suggested. Seems like only 100 miles on the bike is way too soon for a crack to occur.

Thank you


Last edited by sbaugz on Thu Aug 17, 2017 3:47 pm, edited 1 time in total.

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PostPosted: Thu Aug 17, 2017 2:31 pm 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
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Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
Don’t know if this is an issue on your T500, but the Higgspeed bracket for the GT250 has a compatability issue with the T500 rearset. Because of the bends in the Higgspeed bracket you have to put a few washers between the bracket & the rearset mounting plate. If you don’t the mounting plate creates a twisting force on the Higgspeed bracket.

I used the same oil tank on the GT250 cafe project. We are just finishing it up & have a question. How did you connect the oil line to the oil tank?

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BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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PostPosted: Thu Aug 17, 2017 3:45 pm 
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Joined: Fri Jun 19, 2015 5:14 am
Posts: 255
Country: USA
Bikes owned: T500
My oil tank had a fitting on the bottom with barbs on it. See first pic below. I simply pushed the tubing into the fitting.
The other end pushed right into the stock fitting in the oil pump. I basically had an extra banjo fitting laying around from some cracked oil lines that I had. See second pic


ImageIMG_3654 by sbaugz, on Flickr

ImageIMG_3655 by sbaugz, on Flickr


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PostPosted: Thu Aug 17, 2017 4:27 pm 
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World Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 2122
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
A mate of mine had his T500 (non Higgy) expansion chamber weld detach on the Isle of Man a couple of years ago and we worked out that it could have been;
Poor weld
Poor material
Welder been on the liquor
T500 vibration
All the above
Something else entirely.

Hope this helps.

He now has the broken weld rewelded (brazed) properly, and both sides rubber mounted - hasn't had any further problems.
There could be a clue in the sentence immediately above this one!


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PostPosted: Thu Aug 17, 2017 4:47 pm 
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Novice racer
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Joined: Wed Jan 18, 2012 8:01 pm
Posts: 922
Location: North of Albany, NY
Country: USA
Bikes owned: T500R (now), T500M (30 yrs ago)
Poster been on the liquor again? :ssh:


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PostPosted: Thu Aug 17, 2017 6:18 pm 
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Moto GP
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Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
sbaugz wrote:
My oil tank had a fitting on the bottom with barbs on it. See first pic below. I simply pushed the tubing into the fitting.
The other end pushed right into the stock fitting in the oil pump. I basically had an extra banjo fitting laying around from some cracked oil lines that I had. See second pic


ImageIMG_3654 by sbaugz, on Flickr

ImageIMG_3655 by sbaugz, on Flickr

Thanks. What tubing did you use that’s stretchy enough for the barb and seal on the banjo fitting?

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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PostPosted: Thu Aug 17, 2017 7:10 pm 
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To the on ramp

Joined: Fri Jun 19, 2015 5:14 am
Posts: 255
Country: USA
Bikes owned: T500
cannot recall which size tubing. It was silicone. Maybe 1/4" or 5/16" I think.


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PostPosted: Fri Aug 18, 2017 12:16 am 
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Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
ConnerVT wrote:
Poster been on the liquor again? :ssh:

Not on a thursday. :lol:


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PostPosted: Fri Aug 18, 2017 3:06 pm 
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Joined: Fri Jun 19, 2015 5:14 am
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Country: USA
Bikes owned: T500
Just got back from one potential contractor who looked at my chambers. He wanted 5 hours of labor (at least) at $70 per hour to fix my cracked chambers. He wanted to re-fabricate beefier mounts and patch the cracked area. I have no doubt he would do good work, but I am not spending $350 minimum to fix a set of $600 pipes. I probably will shop around for more quotes although my experience thus far has been that nobody wants to mess with stainless. As a last resort, David Higgs has offered to fix them for free, but I have to pay to ship them from the USA to the UK and back, which likely won't be cheap.


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PostPosted: Fri Aug 18, 2017 7:11 pm 
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Moto GP
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Joined: Fri Oct 24, 2008 5:55 pm
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Location: Lancaster Pa.
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Bikes owned: GT750 x2 97 -1200 Bandit 86 GSXR1100
I think it is a good policy to always soft mount the rear chamber mounts to allow for vibration .

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PostPosted: Fri Aug 18, 2017 9:29 pm 
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Joined: Sun Feb 21, 2016 8:32 pm
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Location: Pisgah Forest, N.C. USA
Country: USA
Bikes owned: GT500 T500 GT750
I'd shop around for a good local TIG welder. Stainless requires an argon purge. Look to a private guy, maybe working out of his garage. $100 and an hour later you are golden. Like others said, rubber mount and no stress on the hangers.


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PostPosted: Sat Aug 19, 2017 2:52 pm 
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To the on ramp

Joined: Fri Jun 19, 2015 5:14 am
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Country: USA
Bikes owned: T500
Jimroid wrote:
I'd shop around for a good local TIG welder. Stainless requires an argon purge. Look to a private guy, maybe working out of his garage. $100 and an hour later you are golden. Like others said, rubber mount and no stress on the hangers.


Any tips on how specifically you all are rubber mounting?


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PostPosted: Sat Aug 19, 2017 5:24 pm 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3195
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
I have the same question. The rearsets on the T500/GT250 use the same mounting bolt as the chambers. How to you “loosely” mount the exhaust but solidly mount the rearsets?

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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PostPosted: Sat Aug 19, 2017 10:56 pm 
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Joined: Mon Nov 03, 2008 10:47 am
Posts: 5963
Location: Illinois
I copied the way that they are rubber mounted on a TZ, but with cheaper lighter rubber mounts from a CR125. This
http://www.ebay.com/itm/like/3226532596 ... dispItem=1" onclick="window.open(this.href);return false;
looks like the parts we use. I am about to use my last pair, so I had better check the part number and get some more.


http://www.partzilla.com/parts/detail/h ... 6-000.html


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PostPosted: Sun Aug 20, 2017 6:20 am 
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Joined: Fri Jun 19, 2015 5:14 am
Posts: 255
Country: USA
Bikes owned: T500
tz375 wrote:
I copied the way that they are rubber mounted on a TZ, but with cheaper lighter rubber mounts from a CR125. This
http://www.ebay.com/itm/like/3226532596 ... dispItem=1" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;
looks like the parts we use. I am about to use my last pair, so I had better check the part number and get some more.


http://www.partzilla.com/parts/detail/h ... 6-000.html" onclick="window.open(this.href);return false;



I'll have to see if something like that would work. Unfortunately I am somewhat limited as to where I can mount the chambers because of the rearsets so I doubt those parts you link will work


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