Author Topic: HM300 and HM341 Mufflers  (Read 1148 times)

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Offline DesertKyorugi

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  • '87 GS450 '86'87 ZL600 '73 CB500 '70 '71 '71 CB750
Re: HM300 and HM341 Mufflers
« Reply #25 on: June 08, 2023, 05:01:52 PM »
ZT, just ignore my questions on the PM. I see you have a Dec 1970 which I would recommend getting the No Number Unstamped 300. Just be prepared to re-jet and tune your carbs because the Busso pipes flow much better and louder. Not sure if I posted the picture of the baffles here so I will include it again
US '71 CB750K1 Stored for 39 years, currently running
US '71 CB750K1 Currently running
JDM '71 CB750K1 Stored for 21 years, currently running
US '70 CB750K0 Stored for 28 years, currently in restoration
US '70 CB750K0 Stored for 43 years, currently in restoration
US '70 CB750K0 Currently waiting to be restored
US '73 CB500K2 Stored for 40 years, currently running

Offline newday777

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Re: HM300 and HM341 Mufflers
« Reply #26 on: June 08, 2023, 05:05:46 PM »
ZT, just ignore my questions on the PM. I see you have a Dec 1970 which I would recommend getting the No Number Unstamped 300. Just be prepared to re-jet and tune your carbs because the Busso pipes flow much better and louder. Not sure if I posted the picture of the baffles here so I will include it again
Did the make their own baffles? Which one in the picture?
Is the top one that is black the Honda baffle?
« Last Edit: June 08, 2023, 05:07:40 PM by newday777 »
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 DesertKyorugi

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  • '87 GS450 '86'87 ZL600 '73 CB500 '70 '71 '71 CB750
Re: HM300 and HM341 Mufflers
« Reply #27 on: June 08, 2023, 05:58:13 PM »
Did the make their own baffles? Which one in the picture?
Is the top one that is black the Honda baffle?

The top one in black is a Genuine Honda baffle for HM300. The one below is from Busso. They are interchangeable on the Busso pipe. I confirmed it on my pipe. However, Busso baffle does not fit on the HM300. At least not without using force and I am not about to force it into my HM300 pipe
US '71 CB750K1 Stored for 39 years, currently running
US '71 CB750K1 Currently running
JDM '71 CB750K1 Stored for 21 years, currently running
US '70 CB750K0 Stored for 28 years, currently in restoration
US '70 CB750K0 Stored for 43 years, currently in restoration
US '70 CB750K0 Currently waiting to be restored
US '73 CB500K2 Stored for 40 years, currently running

Offline PeWe

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Re: HM300 and HM341 Mufflers
« Reply #28 on: June 08, 2023, 08:13:23 PM »
DSS = David silver spareparts
They have US and UK internet store. (.com vs .uk)
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 ZTatZAU

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Re: HM300 and HM341 Mufflers
« Reply #29 on: June 08, 2023, 08:26:40 PM »
DSS = David silver spareparts
They have US and UK internet store. (.com vs .uk)
Thanks Pewe!
And yes, I have heard of David Silver Spares but didn't make the connection with "DSS".
I appreciate your reply.
ZT