General Category => Engine & Transmission => Topic started by: Mike Sal on July 28, 2013, 11:52:18 AM
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I have a question for you guys with dual exhausts. What is the center to center spacing between the ends of the pipes (at the back)? I noticed that I have a close clearance between the right side rear bracket and the brake rod. I had the brackets mounted on the inside of the rear drop out plates, but I think they need to be on the outside. I either have to spread the pipes or bend the brackets.
My bike originally had the stubby muffler, so this dual set up I have (purchased from Wollards's son) will have to be tweaked a little to make it a good fit. I had it on temporarily when I first tried to start the bike (a few coughs so far, but I was only spoon feeding fuel to it.
I'd like to get a few reports to see how much these things probably varied.
Mike Sal
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7 1/2" on centers. I have a little over a 1/4" of clearance at the brake rod. If you want a picture, let me know.
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Thanks Rick. My pipes are 7.5 inches exactly, so I'll tweak the brakets.
I had problems trying to install the spiral wrap trim I got from Wayne onto my pipes. He told me that his reproduction stuff is slightly smaller than original (and not made of aluminium like the original) and is a tight fit on original exhaust pipes. I had to sand off most of the powder coating to get them to fit.
Mike Sal
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Wayne told me one time that simplex used a metric pipe size on the exhaust that is NLA, and that is why the exhaust manifolds fit a little loose with his reproduction exhausts. I wonder how much difference the diameter is. I will go measure the ones I got from Wayne, and another that may be original and report back. Measure yours Mike!
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Stock Simplex is 30mm OD while Wayne's is 28.6mm OD. Why would Wayne use such a size? Because 28.6MM is 1.125", which is standard 1 1/8 tube! Mystery solved! I have never tried to buy 30mm tube, but it is probably not readily available here in the US.