Topic: Hm300 pipe vs HM341

[Doum]

Hi
I want to know the difference in stamping from the hm300 to hm341.

HM341 pipe are stamped HMCB750 -- HM341

did the hm300 are normally stamped HMCB750 -- HM300 or just HM300 ?
Did the hm300 are the advertisement stamped on it like oem 341 pipe?


Thanks!

[FeralBoy]

The ones I have seen are all just stamped HM300.  You can look at the following eBay link for a set of the HM300 pipes.  They have a picture of the stamp on them.

http://www.ebay.com/itm/1969-70-Honda-CB-750-KO-Sandcast-Complete-set-of-Original-HM-300-Exhaust-/310681977468?pt=Motorcycles_Parts_Accessories&hash=item485616c27c&vxp=mtr

[Bob Wessner]

May not be germane to the question, but some early diecast bikes (750) had nothing stamped on the pipes

[ekpent]

May not be germane to the question, but some early diecast bikes (750) had nothing stamped on the pipes

Yeah those pipes are crap---If you find any give me a call  !!!!     

[Bob Wessner]

Three of mine are the original unstamped. As soon as they look like crap, I'll send them. 

[ekpent]

Three of mine are the original unstamped. As soon as they look like crap, I'll send them. 

How early is that bike Bob ? Thought those unstamped,think there called root pipes ?, were kind of a Sandcast deal.

[Bob Wessner]

It's a die cast with a build date of Nov. '69. If what you say is correct, perhaps the original owner thrashed his pipes and replaced them with a set from an older bike?? 

[Retro Rocket]

Three of mine are the original unstamped. As soon as they look like crap, I'll send them. 

How early is that bike Bob ? Thought those unstamped,think there called root pipes ?, were kind of a Sandcast deal.

Lotus root...

[zzpete]

It's a die cast with a build date of Nov. '69. If what you say is correct, perhaps the original owner thrashed his pipes and replaced them with a set from an older bike?? 

I just picked up a 11/69 it also has unstamped pipes 12000 serial#. I have a 12/69 and it has HM300, 16000 serial#.

[ekpent]

It's a die cast with a build date of Nov. '69. If what you say is correct, perhaps the original owner thrashed his pipes and replaced them with a set from an older bike?? 

I just picked up a 11/69 it also has unstamped pipes 12000 serial#. I have a 12/69 and it has HM300, 16000 serial#.

Interesting,sounds like we are on to maybe closing in on a changeover date for the no stampers.Must be original to the bike Bob.

[zzpete]

It's a die cast with a build date of Nov. '69. If what you say is correct, perhaps the original owner thrashed his pipes and replaced them with a set from an older bike?? 

I just picked up a 11/69 it also has unstamped pipes 12000 serial#. I have a 12/69 and it has HM300, 16000 serial#.

Interesting,sounds like we are on to maybe closing in on a changeover date for the no stampers.Must be original to the bike Bob.

I know the 11/69 has the originals, I bought it from the original owner who took them off in 1972 and installed a header. They are in nice shape. The 12/69 I'm not sure. I know someone with a 3/70 who has unstamped pipes but he doesn't know the history of the bike either.

[Stev-o]

That eBay seller has some great parts. I've bought a couple items from him for my Z1.