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Author Topic: CB750 K0 muffler design  (Read 315 times)

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Offline tlbranth

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CB750 K0 muffler design
« on: October 05, 2018, 05:32:30 pm »
Pretty soon I'll be having a go at building a new 4 into 4 exhaust system for my CB750 K0. This will include building the mufflers. I'd like to stick to the original sound as closely as possible. So If anyone (hondaman?) could fill me in on the original muffler design I'd be all ears. Thanks in advance for your help.
1970 CB750 K0
1975 GL1000
1999 GL1500
2002 VT750-CDA ACE - Momma's bike
Terry

Offline PeWe

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Re: CB750 K0 muffler design
« Reply #1 on: October 05, 2018, 09:54:13 pm »
Maybe a member has a rotten HM300 pipe that can be cut open?
The even earlier Lotus root pipes are more open with minimum of discs inside. Darker sound.

CB750 has its typical sound despite exhaust. I replaced my Lotus Root 4-4 pipes a few weeks ago, now Hindle 4-2-1, visited a friend on the countryside that heard that I was coming for a visit. He did not know that I have switched pipes.
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 stock looking project started 2017

Offline evinrude7

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cb750 k6 - ugly

Offline 70CB750

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Re: CB750 K0 muffler design
« Reply #3 on: October 06, 2018, 07:22:55 am »
Cyclex has headers 4 to 4, just find mufflers. 

Offline JamesH_Sussex

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Re: CB750 K0 muffler design
« Reply #4 on: October 06, 2018, 11:09:11 am »
Pretty sure there is a thread on here somewhere?

Offline JamesH_Sussex

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Offline JDS

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Re: CB750 K0 muffler design
« Reply #6 on: October 06, 2018, 11:21:02 am »
I think the baffles has a large part to play in it. I've been told there is a difference in the sound of the 300 compared to a 341 and I believe the baffles were different. I just replaced a rather rusty set of 300s on my k1 with some much nicer 341s. The 300s are going into the scrap pile and if it would help you're more than welcome to the best one out of the bunch. Maybe a forensic autopsy would reveal something.

Offline 754

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Re: CB750 K0 muffler design
« Reply #7 on: October 06, 2018, 12:19:12 pm »
That would be where to start , he is in WA state.
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Offline PeWe

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Re: CB750 K0 muffler design
« Reply #8 on: October 06, 2018, 12:32:38 pm »
I think the baffles has a large part to play in it. I've been told there is a difference in the sound of the 300 compared to a 341 and I believe the baffles were different. I just replaced a rather rusty set of 300s on my k1 with some much nicer 341s. The 300s are going into the scrap pile and if it would help you're more than welcome to the best one out of the bunch. Maybe a forensic autopsy would reveal something.
Cut open autopsy of the HM300 and publish photos here would be perfect!
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 stock looking project started 2017

Offline kmb69

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Re: CB750 K0 muffler design
« Reply #9 on: October 06, 2018, 01:09:48 pm »
I think the baffles has a large part to play in it. I've been told there is a difference in the sound of the 300 compared to a 341 and I believe the baffles were different. I just replaced a rather rusty set of 300s on my k1 with some much nicer 341s. The 300s are going into the scrap pile and if it would help you're more than welcome to the best one out of the bunch. Maybe a forensic autopsy would reveal something.

Baffles are way different. The baffle really doesn't do so much in the 341 pipes as they are heavily baffled internally.

Offline tlbranth

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Re: CB750 K0 muffler design
« Reply #10 on: October 06, 2018, 03:46:57 pm »
That would be where to start , he is in WA state.

I'm not familiar with the nomenclature so I'm assuming 300's go on a K0. If so I would love to have one I could take apart. Would you please pm me with details? Thanks. I'd be happy to post pictures of the construction.
1970 CB750 K0
1975 GL1000
1999 GL1500
2002 VT750-CDA ACE - Momma's bike
Terry

Offline ekpent

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Re: CB750 K0 muffler design
« Reply #11 on: October 07, 2018, 05:09:17 am »
300's were used on the 1971/K1 also. I think member Lordmorphy or something spelled like that was once making or having some luscious looking 4 to 4 CR style pipes made once.
« Last Edit: October 07, 2018, 05:12:10 am by ekpent »

Offline PeWe

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Re: CB750 K0 muffler design
« Reply #12 on: October 08, 2018, 09:50:47 pm »
lordmoonpie    http://www.moonpie.co.uk/
Here an interesting thread about alternative 4-4
http://forums.sohc4.net/index.php/topic,61931.0.html
« Last Edit: October 08, 2018, 09:53:09 pm by PeWe »
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 stock looking project started 2017

Offline ekpent

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Re: CB750 K0 muffler design
« Reply #13 on: October 09, 2018, 05:35:05 am »
 Lordy - Lordy -  lordy knew it was something like that PeWe  ;D  Good memory on you !
« Last Edit: October 09, 2018, 10:03:59 am by ekpent »

Offline PeWe

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Re: CB750 K0 muffler design
« Reply #14 on: October 09, 2018, 09:25:54 am »
That name is unusual..lordcreampie...hmmm lordmoonpie... I checked out his site about CR750 4-4 pipes a few years ago.
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 stock looking project started 2017

 

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