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Post by rowdyrandy on Nov 1, 2010 19:36:15 GMT -5
hey guys, well... i've been a long time snooper and now it seems its time to finally man up and join, feels like the right thing to do and don't i need the help! About a few months ago i picked up a stock 75 xs650b and after enjoying it as is i decide to search for a few parts. Enter the mac 2 into 1 exhaust. Picked this up off of craigslist about a week ago and just got around to putting it on this weekend. Got the stock headers off and began to mock these up and it suddenly hits me that nothing here seems right. The diameter of the pipe at the head is smaller than stock and its about twice as long, leaving about a 1/4 inch gap..whats going on here?  my first reaction is these aren't made for a 650, but why sell them as such if it's only going to come right back to you...i thought this would be a no brainer, can anybody shed some light on this before i call the guy up and take em back? Attachments:
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Post by XS Rod on Nov 1, 2010 23:29:40 GMT -5
What is the diameter of the MAC exhaust? The stock exhaust is double walled and may measure larger. The clamp does not sit flush against the head, but make sure you don't have two exhaust seals stuck in the port. If the exhaust seal is the old one it's "probably" going to leak when you fire it up.
BTW... Is that an allen cap screw I detect in the upper attachment where a stud should be? You can find a replacement stud if you look.
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Post by rowdyrandy on Nov 2, 2010 10:16:59 GMT -5
i'm going to get offer to the garage today and take some measurements but everything thing else i'm hearing about this says that this is normal...it just seems like you're asking for a leak this way, why not just make them fit like the stock exhaust.....right?
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Post by XS Rod on Nov 2, 2010 10:55:50 GMT -5
I'm confused bro... do you mean the gap between the exhaust clamp and the head? You should have a gap there in my opinion as it ensures a tight fit. Also allows you some play in pipe alignment along the side of the bike.
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Post by 5twins on Nov 2, 2010 11:15:00 GMT -5
The fit looks normal for the MACs. I have their regular headpipes and it's the same. Mine sit even farther out now because I added homemade inserts from the stock headpipe ends to help seal the MACs better. They leaked like crazy when I 1st mounted them .....   |
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Post by rowdyrandy on Nov 2, 2010 17:35:51 GMT -5
yeah the gap I referring to is between the clamp and the head itself, I agree that some gap is needed to allow for compression onve the pipe is torqued down but this just seemed excessive....5twins you've got a good idea there, I was entertaining the idea of cutting the pipes right at the flange and then using a kit like the one from lowbrow to get a better seal and close the gap. But money being what it is that might have to wait...  |
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Post by rowdyrandy on Nov 2, 2010 17:40:29 GMT -5
heres the kit from lowbrow.... Attachments:
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Post by rowdyrandy on Nov 2, 2010 17:41:14 GMT -5
This message was deleted by the original poster.
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Post by richard on Nov 2, 2010 18:44:42 GMT -5
It might be that you have two exhaust gaskets on the head. Did you forget to pull the old gasket out before you put the new one in?
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Post by rowdyrandy on Nov 4, 2010 16:42:23 GMT -5
no only one gasket in there and the pic i have is it installed without any gasket in there
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Post by richard on Nov 4, 2010 18:25:42 GMT -5
Mine is about 3/16 of and inch but mine are stock I guess you could make them fit. Just make sure you cut them straight so they won't leak
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Post by XS Rod on Nov 4, 2010 19:31:46 GMT -5
5twins, Do you sue two crush gaskets with your inserts? I'm kinda certain you would, but curious.
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Post by 5twins on Nov 5, 2010 11:59:59 GMT -5
No, only one where shown (between pipe and insert). The insert is just stuck into the head with some Yamabond. The reason for this is I also have a filler ring in there to fill the step in the port. You can see it to the left of my insert in the 2nd pic above. Here it is just stuck in the port .....  In order for this to fit correctly, you can't have a gasket that compresses between the insert and head. |
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Post by XS Rod on Nov 5, 2010 13:49:51 GMT -5
Nice... and obviously the Yamabond meets the thermal requirements...  |
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my first reaction is these aren't made for a 650, but why sell them as such if it's only going to come right back to you...i thought this would be a no brainer, can anybody shed some light on this before i call the guy up and take em back? 
