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Author Topic: Yamiya M066S No Number Exhaust  (Read 689 times)

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Offline jwurbel

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Yamiya M066S No Number Exhaust
« on: August 15, 2022, 04:38:36 PM »
Received a set from David Silver.  Everyone of them have 4 small dimples or indents in the middle of each one.  Does that seem right?  Have call into DS but they are on some kind of holiday and are backed up.

Thanks,

Jim
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Offline 69cb750

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Re: Yamiya M066S No Number Exhaust
« Reply #1 on: August 15, 2022, 04:45:47 PM »
Probably internal baffle spot welds, post a photo.
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Offline newday777

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Re: Yamiya M066S No Number Exhaust
« Reply #2 on: August 15, 2022, 05:50:28 PM »
Yamiya M066S No Number Exhaust
What do those fit???
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline PeWe

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Re: Yamiya M066S No Number Exhaust
« Reply #3 on: August 15, 2022, 08:20:59 PM »
Quote from: newday777 on August 15, 2022, 05:50:28 PM
Yamiya M066S No Number Exhaust
What do those fit???
MO66S is Yamiya internal part number.
https://www.yamiya750.com/index.php?main_page=product_info&products_id=142

There are photos here to verify what to expect.
My K2 has a set.

Yamiya has written that they are even better than HM300!

"The sound of No-Number (unmarked) exhaust is a little louder than HM300 or HM341 exhaust."

Louder means better flow for me ;D
« Last Edit: August 15, 2022, 08:23:38 PM by PeWe »
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline leovich

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Re: Yamiya M066S No Number Exhaust
« Reply #4 on: August 27, 2022, 12:10:56 PM »
I have on mine K0 too, just bought 2 weeks ago from DS, they looks nice and sounds better :)
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Offline MauiK3

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Re: Yamiya M066S No Number Exhaust
« Reply #5 on: August 27, 2022, 02:08:25 PM »
My K3 has a set.
Awesome sound
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1973 CB 750 K3
10/72 build Z1 Kawasaki
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