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Post by kristoph on Jun 7, 2008 18:28:14 GMT -5
I have a '81 SR500 that I recently purchased. I think it has an aftermarket head pipe. Would anyone be willing to have a photo emailed to them to help me id this pipe? The pipe has a 1/8" hole near the top by where the pipe mounts to the head and also the same size hole near the point where it mounts to the muffler. I am not sure why these holes are there but I assume a previous owner drilled them Why I'm not sure. I just got a used stock head pipe which is marked Yamaha 4X7-2 Is this correct for a SR? The 2 drilled holes in the head pipe bother me but perhaps someone will know what this pipe is?? Could these holes just be patched if in fact they were not original to this aftermarket pipe. This pipe has a slightly different bend than the stock one I have. my email is cmvmmm@bwsys.net
Thanks!
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Post by G Man on Jun 7, 2008 23:30:21 GMT -5
I answered your PM and sent you a link on how to post a pic.
Sounds to me like a standard headpipe. The stockers are the only ones I know of that are double walled and have the holes top and bottom from the factory.
G Man
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Post by StewRoss on Jun 8, 2008 1:15:54 GMT -5
Here's a pic of a standard header on an SR400 engine...it's the same as a 500 one.  SR  |
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Post by caferacercarl on Jun 9, 2008 0:30:29 GMT -5
4X7 is XV yamaha V twin, you would have the front header. cheers.
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Post by kristoph on Jul 2, 2008 13:38:41 GMT -5
Thanks to all for the help here. What would be best- Just weld up the top hole, it does have some exhaust coming out of it, or get a new head pipe? I'm sure the inner pipe has some sort of fault causing this. The head pipe is in otherwise good shape so I don't really want to spend the $200 + to replace it.
The virago pipe was returned to the ebay seller for a refund!!
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Post by StewRoss on Jul 3, 2008 2:35:34 GMT -5
You could do that, but to get another pipe is the final answer. The inner tube seems to crack after a lot of use at about the top bend in the header. It could probably eventually mess the exhaust flow up a bit as well. You'll often get a dark blued heat area in the same place on the pipe to let you know. SR |
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Post by caferacercarl on Jul 12, 2008 18:30:56 GMT -5
Hassle Deus by email asking where are the new exhausts that are cheap and manufactured by the globally famous Hi Tech company. they look great as well
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Post by robinpeck on Sept 30, 2008 12:14:19 GMT -5
I was just about to put a message on here inquiring about the same thing....those little holes...mine covered (when I bought it) with hose clamps....I plan to replace the whole system anyway...but I was wondering what those holes were all about...so they are part of the monting system for an exhaust cover..a sort of partial double wall exhaust pipe? I answered your PM and sent you a link on how to post a pic. Sounds to me like a standard headpipe. The stockers are the only ones I know of that are double walled and have the holes top and bottom from the factory. G Man |
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Post by G Man on Sept 30, 2008 14:12:48 GMT -5
I was just about to put a message on here inquiring about the same thing....those little holes...mine covered (when I bought it) with hose clamps....I plan to replace the whole system anyway...but I was wondering what those holes were all about...so they are part of the monting system for an exhaust cover..a sort of partial double wall exhaust pipe? I answered your PM and sent you a link on how to post a pic. Sounds to me like a standard headpipe. The stockers are the only ones I know of that are double walled and have the holes top and bottom from the factory. G Man Hey, how ya' doing. The original pipe is a double walled unit. The holes are merely so the pipe can vent any condensation etc... from between the two. Not to mount from or to. What happens is eventually the inner wall rots and then the unit exhausts through the holes. Time to replace the pipe. Some just cover up the holes un-aware of what they are for. The exhaust flow can get impeded though when the inner wall fails. G Man |
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