Author Topic: Differing Exhausts  (Read 615 times)

Offline rbt1548

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Differing Exhausts
« on: December 17, 2021, 10:48:00 AM »
I have been plodding through my newly acquired K5, tidying up and sorting bits here and there as required, there are a few bits needing fettled as it original, wheel rims looking a bit forlorn with chips and thinning chrome. I had a look at the exhaust system  and noticed the both the right side are HM341's but both the left are HM300's.

 With the bike being over 40 years old there have probably been various changes to it by previous owners and why the HM300's were fitted we will never know, there could be lots of reasons.

The bike starts easily and runs nicely through the rev range the way it is, would the differing exhausts make a great deal of difference to the running of the bike in the long term?, if so what would be my options?

The K5 is basically my first 4 cylinder bike in 46 years of having bikes, mostly twins, (although I did get a CB550 which was certainly not as described and was sold within a week without me even riding it), so I am learning about the 4's as I go.
I have restored a number over the years from a Guzzi 1000S to my BSA Lightning Clubman , which I have just sold after 21 years of ownership. I don't have a problem working on the bike but as I mentioned 4s are new to me and I would rather ask a question than horse on and make a mess of something.

I appreciate any advice given regarding the different pipes.

Cheers

Offline philward

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Re: Differing Exhausts
« Reply #1 on: December 17, 2021, 09:03:24 PM »
They are different inside - the removable end caps/baffles are a lot different. The HM300's have a longer removable baffle where as the 341's have more of an end cap. As the 300's are noisier, I assume they are less restrictive and so in theory, would affect the running on 1 & 2 compaired to 3 & 4 I would imagine?
Current Bikes:-
Honda CB750K2 (1975)
Honda CB500K2 (12/1972)
Honda CR750 Replica (1972)
Honda CB350K0 (1969)
Kawasaki ZZR1100D3 (1995)
Kawasaki ZZR250 (1990) Project (Going on eBay ASAP)

Offline rbt1548

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Re: Differing Exhausts
« Reply #2 on: December 18, 2021, 10:59:19 AM »
They are different inside - the removable end caps/baffles are a lot different. The HM300's have a longer removable baffle where as the 341's have more of an end cap. As the 300's are noisier, I assume they are less restrictive and so in theory, would affect the running on 1 & 2 compaired to 3 & 4 I would imagine?

Thank you for your help.

I thought I would take a look inside so I took the end caps/baffles off to see the difference and, lo and behold!, all four are the same, short ones, possibly the long ones were changed over.

I was looking at exhaust sets on internet, pricey, but may need to be an option if I don't think the bike is ok with these exhausts. I also noticed, reading various comments on the forum, that quality and fitment vary greatly, with people mentioning DS, and CSML, I also found Predator do a set but couldn't find much info on them. Possibly trying to source two nearside ones would also be an option, but that leads to ensuring they are good and solid.

We will see how it goes, if I need to get others I suppose I will need to bite the bullet.

Cheers

Offline philward

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Re: Differing Exhausts
« Reply #3 on: December 18, 2021, 12:24:25 PM »
This is what a 300 baffle looks like - so you can see that where it fits in the silencer body is completely different even though the 341 end caps fits the 300 silencer
Picture shows a non standard aluminiun tube that I fitted - so it fits in my CR750 Rep race exhaust
« Last Edit: December 18, 2021, 12:27:17 PM by philward »
Current Bikes:-
Honda CB750K2 (1975)
Honda CB500K2 (12/1972)
Honda CR750 Replica (1972)
Honda CB350K0 (1969)
Kawasaki ZZR1100D3 (1995)
Kawasaki ZZR250 (1990) Project (Going on eBay ASAP)

 

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