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I just got new exhaust pipes, and for the life cant figure out or remember how these things go back in? Do the thicker ones go on 1 and 4 cylinders and the smaller ones go on 2 and 3? or do you mix then up with a big one and small one on each pipe?
Also neither of my bikes (cb750 anb cb500) had exhaust gaskets. All either had was the flanges and thats it? 
@FastCletus552 aka Jimmy C, buildin' rides out of Napa CA
Current Build 1980 CB 750 F
Finished Build 1975 CB 500T Cafe Racer - SOLD
2002 Ducati 998 Biposto
2005 Rossi #46 Scooter
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Are those the half moon inserts that go in between the finned flanges and the exhaust and head? Or are those flanges with bolt holes in them for the sohc exhausts?
I think the sohc had two different types of exhaust mounts. Forget the years where they changed. I believe the dohc mounts are completely different.
1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals
My wife's recipe website that I'm trying to help promote: Strawberries for supper. Yes, I am a lucky man.
My cb750 video site
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yes these are the flanges that go on the exhaust on the DOHC that clamp to the head
@FastCletus552 aka Jimmy C, buildin' rides out of Napa CA
Current Build 1980 CB 750 F
Finished Build 1975 CB 500T Cafe Racer - SOLD
2002 Ducati 998 Biposto
2005 Rossi #46 Scooter
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All of my half moon ones were the same size. I just know that the skinny end goes into the head.
1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals
My wife's recipe website that I'm trying to help promote: Strawberries for supper. Yes, I am a lucky man.
My cb750 video site
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If thats a mac exhaust, use the skinny ones on all four. Put the non rolled end in first then put the flange on around them. Then tighten everything up. If you have any exhaust leaks, like I did after putting a new exhaust on, then try loosening the nuts on the exhaust studs until they are only finger tight, then run the bike for a bout 5-10 mins then slowly tighten everything back up and it should seal up any leaks. Hope that helps. If you tighten everything down and can still move the headers, then flip those flanges around, and tighten it all back down. I did that on mine, had em in backwards and had alot of play in the headers with the bolts all tightened down.
I know enough to get me in trouble.
1981 Yamaha XS650 Special(current cafe, code name El Diablo Rojo)
1981 CM400C, completed project (code name Home Wrecker)
1981 CB750K, completed project (code name Winter Blues)
SOLD 9-21-2013 gone but certainly not forgotten.
2009 USA Choppers Bad Boy, rigid frame custom chopper.
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I found the crush washer gaskets. Still perplexed how the flange gaskets go back in though.
@FastCletus552 aka Jimmy C, buildin' rides out of Napa CA
Current Build 1980 CB 750 F
Finished Build 1975 CB 500T Cafe Racer - SOLD
2002 Ducati 998 Biposto
2005 Rossi #46 Scooter
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didnt see the previous post prior to posting mine I will try that tonight. Do you think an auto parts store might have a set of the crush washers? All bike shops closed today
@FastCletus552 aka Jimmy C, buildin' rides out of Napa CA
Current Build 1980 CB 750 F
Finished Build 1975 CB 500T Cafe Racer - SOLD
2002 Ducati 998 Biposto
2005 Rossi #46 Scooter
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I wouldnt know as I didnt replace or see any crush washers on my bike, 81 750k. I put a 4-1 mac exhaust on, and the only one that leaked was the number 4, I did the washer around the stud, run it then tighten it trick and that sealed it up.
I know enough to get me in trouble.
1981 Yamaha XS650 Special(current cafe, code name El Diablo Rojo)
1981 CM400C, completed project (code name Home Wrecker)
1981 CB750K, completed project (code name Winter Blues)
SOLD 9-21-2013 gone but certainly not forgotten.
2009 USA Choppers Bad Boy, rigid frame custom chopper.
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Administrator
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I really doubt an auto parts store will have the crush washer/gasket. However most Honda shops still stock them. They are used on most every Honda bike made.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Just curious FastCletus, did you get it all worked out?
I know enough to get me in trouble.
1981 Yamaha XS650 Special(current cafe, code name El Diablo Rojo)
1981 CM400C, completed project (code name Home Wrecker)
1981 CB750K, completed project (code name Winter Blues)
SOLD 9-21-2013 gone but certainly not forgotten.
2009 USA Choppers Bad Boy, rigid frame custom chopper.
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Yes and no. I finally figured out that the NON flanged in goes into the head and the flanged end goes against the pipes. I also found the old crush washers, so I ordered a new set and they should be here today. So I haven't got it all back together yet. I will post up when I get it done tonight
@FastCletus552 aka Jimmy C, buildin' rides out of Napa CA
Current Build 1980 CB 750 F
Finished Build 1975 CB 500T Cafe Racer - SOLD
2002 Ducati 998 Biposto
2005 Rossi #46 Scooter
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That should get her all fixed up, good luck!
I know enough to get me in trouble.
1981 Yamaha XS650 Special(current cafe, code name El Diablo Rojo)
1981 CM400C, completed project (code name Home Wrecker)
1981 CB750K, completed project (code name Winter Blues)
SOLD 9-21-2013 gone but certainly not forgotten.
2009 USA Choppers Bad Boy, rigid frame custom chopper.
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Well one problem done and back to another. THIS THING RUNS LIKE SHIT. The bike ran fine prior to new pipes. I put a new valve cover gasket on, put new sparkplug wires on (yes I labeled them and put them in the right spots) and the new exhaust and it sounds like there is something stuck in the pipes? I ended up pulling muffler off and looking both ends thinking I might of left some packing material in the pipe. Nope
I thought I might need new jets, but didnt think it would be this bad. It runs but very sluggish and coughing
@FastCletus552 aka Jimmy C, buildin' rides out of Napa CA
Current Build 1980 CB 750 F
Finished Build 1975 CB 500T Cafe Racer - SOLD
2002 Ducati 998 Biposto
2005 Rossi #46 Scooter
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Administrator
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What pipes and muffler do you have?
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mac 4 into 1
I guess after i thought about this, i am sure I need to adjust fuel /air screws to accept the new pipe What is standard on CB 750F 1980? 3 turns out?
@FastCletus552 aka Jimmy C, buildin' rides out of Napa CA
Current Build 1980 CB 750 F
Finished Build 1975 CB 500T Cafe Racer - SOLD
2002 Ducati 998 Biposto
2005 Rossi #46 Scooter
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Yo Cletus - Just wondered how much you paid for those crush washers. I bought mine from Honda shop and I think I got robbed.
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I think 10 or 12 online from Flea bay for all 4
@FastCletus552 aka Jimmy C, buildin' rides out of Napa CA
Current Build 1980 CB 750 F
Finished Build 1975 CB 500T Cafe Racer - SOLD
2002 Ducati 998 Biposto
2005 Rossi #46 Scooter
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Okay, so excuse the noobness of raising an older thread, but...
So what do I precisely need??? I ordered the MAC 4-1 exhaust, have the same set of flanges, and the exhaust. So you're telling me I need to track down these crush washers too? And what order does everything go?
I was hoping to put the exhaust on tonight, too...
Turbos, Hondas, 4-bangers, what could go wrong?
 Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Local Honda shop should have crush washers. I think I paid 13 for all four from ebay. Make sure when you pull old pipes off you take old crush washers out. Mine were pretty compacted in there. took a screw driver and hammer to tap lightly to pop them out. BE GENTLE WHEN DOING THAT. I then cleaned the area out and reinstall everything and vroom. Shouldn't take more than an hour.
I ended up not (so far not) needing to change jets on carb, but was thinking about rejetting just to see difference
@FastCletus552 aka Jimmy C, buildin' rides out of Napa CA
Current Build 1980 CB 750 F
Finished Build 1975 CB 500T Cafe Racer - SOLD
2002 Ducati 998 Biposto
2005 Rossi #46 Scooter
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I have a Dynojet Stage 1 kit coming so I will be rejetting. Going to remove the baffle from the exhaust - loud pipes save lives, right?
Awesome, now to find a good local Honda shop. I just looked up the schematic on BikeBandit (couldn't find anything in the FSM) for the exhaust and it shows how everything is supposed to work. And since someone told you to use the short flange set, that's what I'm going to use as well.
Thanks for the reply!
Turbos, Hondas, 4-bangers, what could go wrong?
Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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