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Author Topic: Stock Exhaust Fitment Question  (Read 2010 times)

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Offline sethmcalister

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Stock Exhaust Fitment Question
« on: June 04, 2015, 05:43:08 AM »
Last year when I remounted my exhaust I did it at night and the pipes were together.  I had an exhaust leak in #2 and #3.  This year, I removed my exhaust so I could put the bike on the lift and hope to solve the leak.  Last night I installed the #3 and #4 pipes in about 10 minutes.  BUT...#2 will not go.  It seems that the half moons simply aren't long enough to push the pipe in where it needs to go.  I tried both sets of collars that I had and both were the same.

Are there different length half moons cuz I'm thinking I have the wrong set.  Or is there a trick to getting the inner lip past the exhaust stud hole (where the exhaust stud screws in), cuz I can't get the inner moon to get past that for the life of me which is why I was curious as to if there are different length half moons?
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Offline flybox1

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Re: Stock Exhaust Fitment Question
« Reply #1 on: June 04, 2015, 07:11:21 AM »
how are you supporting your exhaust as you fit the headers to the head?

grab a second set of hands to support it while you line up the pipes and tighten them down.
then, mount them to the frame.  might help get #2 seated better
yes, there are 2 different lengths of 'half moons'   
roughly 1" and 1.25"
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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 sethmcalister

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Re: Stock Exhaust Fitment Question
« Reply #2 on: June 04, 2015, 07:55:33 AM »
I had a second set of hands, haha!  I can get the pipe seated fine and the collar set, but the half moons don't touch the exhaust lip in the exhaust port.  The inner half moon lip cannot slide past where the exhaust stud screws in.

Okay, so 1" and 1.25".  Which are correct?  The cmsnl parts fiche shows one size, but not the length.  Is it possible/easier to convert to the F exhaust mount?
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Offline flybox1

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Re: Stock Exhaust Fitment Question
« Reply #3 on: June 04, 2015, 08:08:37 AM »
Flip them over ;D
Like this, right!?
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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 sethmcalister

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Re: Stock Exhaust Fitment Question
« Reply #4 on: June 04, 2015, 08:13:21 AM »
Wait, really? Just flip them over and run them backwards?
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Offline flybox1

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Re: Stock Exhaust Fitment Question
« Reply #5 on: June 04, 2015, 08:15:19 AM »
Nooooo.  You have them on backwards.  ;)
Flip them over so you are running them correctly, as pictured above.
« Last Edit: June 04, 2015, 08:22:06 AM 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

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 sethmcalister

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Re: Stock Exhaust Fitment Question
« Reply #6 on: June 04, 2015, 08:31:07 AM »


So this is wrong?
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Offline flybox1

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Re: Stock Exhaust Fitment Question
« Reply #7 on: June 04, 2015, 08:33:23 AM »
Yes.....that orientation is WRONG!
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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 flybox1

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Re: Stock Exhaust Fitment Question
« Reply #8 on: June 04, 2015, 08:35:04 AM »
look carefully!!!
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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 flybox1

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Re: Stock Exhaust Fitment Question
« Reply #9 on: June 04, 2015, 08:47:00 AM »
shiity drawing, but this is how the half moon collar integrates with the flange.

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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 sethmcalister

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Re: Stock Exhaust Fitment Question
« Reply #10 on: June 04, 2015, 08:48:41 AM »
Hmm... No wonder. I'm glad I've got you guys to knock some sense into me. I imagine that'll speed the install along too
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Offline Don R

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Re: Stock Exhaust Fitment Question
« Reply #11 on: June 05, 2015, 11:01:36 AM »
 Guess how we know that!
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Offline flybox1

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Re: Stock Exhaust Fitment Question
« Reply #12 on: June 05, 2015, 11:13:56 AM »
Quote from: Don R on June 05, 2015, 11:01:36 AM
Guess how we know that!
Shhhhhh!  :-X
 ;D
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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 sethmcalister

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Re: Stock Exhaust Fitment Question
« Reply #13 on: June 05, 2015, 10:26:24 PM »
Haha thanks for the boost!

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Offline Flyin900

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Re: Stock Exhaust Fitment Question
« Reply #14 on: June 05, 2015, 11:18:00 PM »
Are you changing the exhaust seals out too when you remove the pipes? These usually will leak if you reuse the old crushed seals.
I always replace those when removing an exhaust before the reinstall.

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Common sense.....isn't so common!

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Offline sethmcalister

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Re: Stock Exhaust Fitment Question
« Reply #15 on: June 06, 2015, 07:32:53 AM »
Ya I had tried that just time the exhaust was off...but since I didn't put the half moons on wrong it didn't work out so well. I knew as soon as I pulled it off and they weren't crushed it was part of the reason for my exhaust leak.

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