i sent an email to the company and monty campbell about the problems and my concerns of buying one of his pipes, this is his reply.
jeff,
Thanks for the link.
You have some very intuitive people on that forum.
They were correct; that system was designed for the DOHC 750/900/1100 (MX1-H4). Not the SOHC 750 (MX1-H2). There is a difference in the length of the head pipe.
I must be terrible with people, because if someone had only asked me, I could have helped them out, & they would not have had to 1) cut the ends off of the head pipes (simply remove the spikots from the cylinder head & use 8 longer bolts), 2) they could have gotten the H2 system instead, & 3) I would have suggested that they install a remote oil drain plug before installing the X-PIPEtm exhaust. With the spikots out, the head pipes, as they were delivered, fit the exhaust ports perfectly. (I did get an email from a gentleman who tried to explain something about spikots and loose fitting pipes in ports. I tried to answer his questions; to help him. He said that his system was a UFO, so it could not possibly have been anyone in your forum.)
The fellow that said something about the midrange increase was spot on.
What they didn't say was that even a free 4into1 (UFO) is no bargain (even if it did work), because the time and materials for the jet kit alone costs more than my genuine X-PIPEtm exhaust.
If you visit one of my eBay listings for a Honda X-PIPEtm, I think that you will see that there is a separate system for the SOHC 750. You should also note that I try to answer questions and make suggestions like the remote drain plug, see end of listing.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=250260653029&ssPageName=STRK:MESE:IT&ih=015I may not be a people person (maybe just a mad inventor?), but I try to help whenever given the opportunity.
I have learned to expect people to struggle with my design - not necessarily mechanically - but emotionally. It is so different from your Dad's UFO, & you have been treated to endless/mindless/mindnumbing magazine BS that it will take anyone a while to see that in this case, at least, different can be a whole lot better. And it is a whole lot better.
There is no way that everyone can accept my invention. Just like I can't settle for a UFO.
Just a little story that you might want to forward to your forum friends:
When drag racing in the midwest, I decided to build the ultimate UFO. I believed in scavenge and all the big name UFO makers - all the magazine lies. I had built and raced many UFO designs at that point. My engineering background from MU helped me do the math and made complex equations manageable. So, after a few designs I felt that I was ready to make some serious improvements. So, one day I decided that in order to enhance/increase scavenge, I needed to not only increase crosssectional area of the pipe (megaphone), I needed to figure a way to suck the heat out of the exhaust gasses, to make them contract, thus creating even more scavenge. I was just sure it would work; cooling gasses always made their volume much less.
So, I built an all copper UFO. I was so sure that I'd be selling hundreds of copper headers.
Opps. It was a complete failure. It ran like CR*P.
That is when I started looking in the opposite direction. I realized that the opposite of scavenge was the real deal. The electrical analogy would be - a UFO is DC (direct current), and my X-PIPEtm is AC (alternating current). When I applied at the patent office for my patent, the head examiner of the exhaust group, a man with an aerospace engineering degree, became very upset emotionally about my exhaust design. You see, every patent up until that point, every patent, anywhere in the world, depended upon scavenge and the more modern ones even went so far as to use anti-reversion devices (diodes) to keep the exhaust gases and even fresh air out of the exhaust port. Patent Examiner Hart stated that my invention "defied all laws of known physics." That was a proud moment for me. I told him that I thought that is what inventing was all about; expanding the known universe of knowledge. He didn't agree for 6 years, during which time he flooded me with patents from everywhere in the world, many not translated, some even from Hitler's germany. Hart was relentless.
Finally, I made a video of the 3 phenominon unknown to the rest of the world. I was able to demonstrate the 3 phenominon that made my X-PIPEtm kick ass. I flew my patent attorney to Washinton, with me. In Hart's art group, surrounded by his many examiner employees, I demonstrated the real physics to Hart. At the end of the 3rd video clip, Hart threw his hands in the air and shouted, "I can't allow myself to watch any more of this!" Then, he looked around to see that his many employees were stunned, staring at him.
He rushed us into his office. He pulled out a book written by 2 British gentlemen. He flipped it open to what appeared to be a well worn page. There he held his book up to me, pointing to a air flow diagram, He said, "That is how air is supposed to flow."
I said, "That diagram defies the law of conservation of momentum."
He looked back at the book and said, "You are right?"
I said, "If it is in the book, I didn't invent it, so I don't deserve a patent. If it's not in the book, you won't give me a patent. So, how do I get a patent around here?"
Hart said, "I can't give a patent of this magnitude to someone like you; you are just a greasey car mechanic. If you were General Motors, or Honda, I could give you this patent."
So, you see, not only do I have a terrible personality, but I am also just a greasey car mechanic. A greasey car mechanic that seemed to know at least 3 things that no one else knew. Only because I made a UFO that was a complete mistake.
To test the result of one of my 3 theories, remove the baffles from my MX1 X-PIPEtm, let the engine idle as low as possible, now drop a small piece of paper behind one megaphone opening. After several attempts you should see that the paper will usually be sucked up inside of one megaphone & be immediately blown out the opposite megaphone. You see, reversion is good - scavenge is bad. Quite the opposite of what our magazine friends have been telling us.
Think of all of those world wide patents, out of date and simply wrong all along. Think of the man hours wasted and millions of UFOs cluttering up otherwise fine motorcycles.
Anyway, I hope that this helps you and that you will share some of this with your friends on the forum.
Thank you,
Monty Campbell
i am interested in your pipe for my 1974 honda cb750k, however i do have some concerns. a friend got one for his 750k and there were several fit problems, the pipe hung VERY low (pic included) requiring extensive modifications to make it fit. the pipe ends themselves were also apparently a loose fit in the head as well. the thread discussing this is ->
http://forums.sohc4.net/index.php?topic=22600.0 
