Exhaust systems

[Andy1976]

Hi all,
I've a Motad 4-1 which I've put back on my F1 as the BSM system that I bought sat to low to the ground (Looked daft too).
I'm happy using the motad for now, but it sounds too quiet. Is there a louder system still available to buy or is there anything I can do to the motad to increase noise?

Andy

[SteveD CB500K0]

A couple of years ago my mate Jim Shea (still registered here but no longer an sohc owner) had the same problem. He called Motad and they suggested that he drill a circle of 1/4" holes in the back plate of the silencer. It did sound nicer after that (and interesting that Motad should suggest it!)

[Andy1976]

Thanks Steve. I'll give it a go.

[Sprunghub]

Steve....did you ever get the links to the pics I sent of the Dunstall......I only ask because my emails have a habit of going into peoples 'Spam' baskets.....

[SteveD CB500K0]

I don't think so. Can you send them again?

[Sprunghub]

Ok.....keep an eye on your spam box, if you've got one....that's where my mails usually end up, for some reason.

[beveldrive]

Andy
Yes, Im in the same situation as you, it seems. My K7 has the ubiqitous (spelling?) Motad fitted, and like you I'm after a slightly more invigourating sound from the pipe! As I'm 'remodelling' my 750 a bit, I'm happy to deviate from the standard look of this already handsome machine Anyhow, this is my solution:

 
I plan to mig up a short link pipe from the Motad 4-1 headers and mount this Arrow can high-level.
No doubt I'll post some pics as the project progresses. Not sure how my neighbours will react though

Reagrds
Steve

[Sprunghub]

Talking of neighbours.....my next door neighbour has an engineering firm & he's currently re-fabbing a lump of solid staniless steel & a piece of perforated stainless sheet into a 1976 tail end......photo's will follow (if it comes off ....& doesn't come off ! )

[Skunkmiester]

I've got the opposite problem. I have just ordered a new set of 4 into 4 baffleless megaphones from Swarbrick. These should sound rather nice methinks. However I will need to be able to get the bike through it's MOT so for one day a year I will need to make the exhausts capable of being quiet so as not to annoy the examiner.

Does anyone know If I will be able to make baffles that are capable of doing this? Or will I need to refit an old quiet 4 into 1 system just for the test?

cheers

[SteveD CB500K0]

Get an old Motad off eBay and use that.

Swarbricks are the loudest thing you've ever heard on a racetrack - let alone the road!

[Seamus]

The noise level for these older bikes is down to the discretion of the MoT examiner. I used to get a Z1000 with a Vance @ Hines with very little baffle through as the guy liked the sound. If the system is not redicusly loud, the you may be OK

[Bryanj]

Seamus, they have changed the rules again. What the test book says now is that it must be as quiet as the standard exhaust in good condition so you need a tester you have know for years who trusts you to get away with anything else------ESPECIALY as VOSA now have the capability to sit just out of sight with a laptop and tell the instant he prints a ticket so they can knock on the door within minutes and ask to retest the bike themselves!!

[Seamus]

Interesting point Bryan. First you must find a tester the remembers how loud a bike of that age was!! Not too many with original exhausts to compare against...
Always worth a chat with the tested before hand to see how they feel about the noise.
Cheers

Seamus

[Bryanj]

Well as an unoficial asside my tester was told that if he would be pissed off by the bike going past his bedroom at 3am it should fail!

[Seamus]

If his bedroom is on the 15th floor, then it could be pretty loud