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Author Topic: 38mm exhaust flanges - where to buy.  (Read 957 times)

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Offline flybox1

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38mm exhaust flanges - where to buy.
« on: June 23, 2012, 05:14:54 PM »
Swapping my rusted 4/4's for a 4/1. The header pipes are 3 mm larger than my old pipes., but fit fine up against my new brass crush washers. These flanges are too small.  Do these sections pry apart, or do I need to buy 38mm?
where can I find them?


On a side note, one of my PO's put crush washers on top of old ones. Pita to get the bottom ones out. >:(
« Last Edit: June 23, 2012, 05:18:30 PM by flybox1 »
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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Offline Terry in Australia

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Re: 38mm exhaust flanges - where to buy.
« Reply #1 on: June 23, 2012, 05:20:42 PM »
G'Day Mate, no, they don't pry apart, they're spot welded together. What brand of exhaust have you installed? If it's a Kerker or a Mac etc, you can probably buy the flanges from the manufacturer? Cheers, Terry. ;D
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Offline flybox1

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Re: 38mm exhaust flanges - where to buy.
« Reply #2 on: June 23, 2012, 05:26:54 PM »
Thanks Terry,
i got this one from Greggo
http://forums.sohc4.net/index.php?topic=101095.0
No idea what it is.  No markings.

guesses anyone?  :P
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Terry in Australia

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Re: 38mm exhaust flanges - where to buy.
« Reply #3 on: June 23, 2012, 05:37:19 PM »
Looks like a Kerker to me mate. Cheers, Terry. ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline flybox1

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Re: 38mm exhaust flanges - where to buy.
« Reply #4 on: June 23, 2012, 05:54:24 PM »
Thanks again., Terry.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Terry in Australia

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Re: 38mm exhaust flanges - where to buy.
« Reply #5 on: June 23, 2012, 06:10:47 PM »
Do you have a place nearby that sells aluminum products mate? I reckon a length of aluminum tube with similar ID and OD, split down the middle with a hacksaw, would do the trick? Cheers, Terry. ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline flybox1

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Re: 38mm exhaust flanges - where to buy.
« Reply #6 on: June 25, 2012, 01:37:18 PM »
Just in case someone else runs into the same problem, and to close this thread.
I couldn't find anything locally with the right OD and wall thickness to use.
So I called MAC Performance, and they had some for a 77/78k that will fit.
$15 + shipping for the set.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"
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