Author Topic: Straight Through Exhaust (Read 8959 times)

Skippernick · « **on:** 15 December 2012, 08:26:40 pm »

Took my mircon end can off yesterday, MOT soon and my IAM observer liked it but could hear all my small adjustments and was criticising them.
Anyway shown a torch down it and it shines straight through. I run a standard air filter and i have not rejetted the carbs and its standard yamaha downpipes.
My question is, is this damaging the engine in any way, back pressure an issue? Or am i just worrying? I know the law might not like it but i'll run that risk.
Many thanks
Nick

CharlieDee · « **Reply #1 on:** 15 December 2012, 10:11:05 pm »

could you post a picture of your can? myself and many other foccers will be able to give an opinion once we can see it!!

darrsi · « **Reply #2 on:** 16 December 2012, 10:27:49 am »

I used to have a Quill straight through pipe on mine, it didn't need re-jetting, and caused no problems, and even got through MOT's.

I now have a Moto GP can, which sounds a bit lively and has BSAU markings, and i've drilled the outlet holes bigger on the baffle to let the air flow a bit better whilst staying 'legal', and it's worked rather well.

You are supposed to declare an aftermarket can to your insurers as well, just so they don't use it as an excuse not to pay on a claim!

As for the boys in blue, read this........

http://www.bikechatforums.com/viewtopic.php?t=167986

stevierst · « **Reply #3 on:** 16 December 2012, 06:54:53 pm »

As long as it doesn't say "Not for road use" on the can anywhere then it's ok with regards to the law. AS LONG AS YOU NOTIFY YOUR INSURANCE COMPANY!!!!

And if you leave the baffle out, just behave yourself near cops and in built up areas. But if VOSA get hold of you and your above the DB limit, they will put a prohibition notice on your bike until you get it re-MOT'd. (been there, done that)

There's a lot of contraversy about whether it will do any damage, not done any of mine any harm in the last 100k miles or so. It just removes the factory restrictions that got them through the tough emission legislations at the time.
Hope this helps

Skippernick · « **Reply #4 on:** 16 December 2012, 07:20:17 pm »

Guys that is very helpful and thank you.
I bought the can from Rangally on here, it came with his bike. I think it has been cut down at some point because it seems very short, and therefore no baffle at all. Also there is no "Not for road use" stamp on it or a british kite mark, so have no idea about its legality.
I also don't mess around too much anyway let alone in town or near police.
Insurance company know and aren't to bothered about either.
Thanks again guys, but more opinions welcome.
Nick

stevierst · « **Reply #5 on:** 16 December 2012, 07:24:15 pm »

Quote from: Skippernick on 16 December 2012, 07:20:17 pm

Guys that is very helpful and thank you.
I bought the can from Rangally on here, it came with his bike. I think it has been cut down at some point because it seems very short, and therefore no baffle at all. Also there is no "Not for road use" stamp on it or a british kite mark, so have no idea about its legality.
I also don't mess around too much anyway let alone in town or near police.
Insurance company know and aren't to bothered about either.
Thanks again guys, but more opinions welcome.
Nick

I had an 'unmarked' carbon can on my old R1 streetfighter, and hell fire it was very loud!! As I set off for work at 6 in the morning, it was a bit too loud and cruel to the neighbours. I bought a DB killer off fleabay, tuned it by reducing it's length so I was happy with the noise and fitted it. Raspy, but not too loud.

Skippernick · « **Reply #6 on:** 16 December 2012, 09:32:54 pm »

That is the same problem i have although not that early in the morning.
I'll look into that, was it easy, who did you use?

stevierst · « **Reply #7 on:** 16 December 2012, 09:59:59 pm »

Good old fleabay did it for me. I just measured the inside diameter of my tailpipe and ordered that size. Cost me about £10 if I remember rightly

Skippernick · « **Reply #8 on:** 17 December 2012, 01:38:00 pm »

Yeah had a look on ebay, £20 now, is it the overall internal diameter of the can or the internal diameter of the exit port/hole?

Lawrence · « **Reply #9 on:** 17 December 2012, 01:43:07 pm »

Quote from: stevierst on 16 December 2012, 06:54:53 pm

And if you leave the baffle out, just behave yourself near cops and in built up areas. But if VOSA get hold of you and your above the DB limit, they will put a prohibition notice on your bike until you get it re-MOT'd. (been there, done that)

Any idea what the dB limit is?

darrsi · « **Reply #10 on:** 17 December 2012, 04:10:05 pm »

I keep reading that it's 82db, which seems low to me, but i think it's all a bit of a grey area?
If you have proper BSAU markings, and you have a baffle in, then the chances are you will be left well alone on inspection.
Found this which was informative though:

http://www.bikingandbeyond.co.uk/uk%20vehicle%20requirements.html

stevierst · « **Reply #11 on:** 17 December 2012, 04:12:09 pm »

Not entirely sure. I believe its 96db on vehicles under 3 years old, after that its not included in the MOT, and just put down on your recomendation as 'noisy exhaust'. As for a cop to issue a prohibition notice, they gave to be specially trained I believe.

In Lancs they have the bikesafe days where they pull every bike and VOSA are there with all the kit. That's how I got caught about 10 years ago before I was in the job. But these days are rare thankfully.

By the way, 96db is bloody loud! Fit a baffle, and your well below the limit.

darrsi · « **Reply #12 on:** 17 December 2012, 04:35:33 pm »

When i first had an MOT after putting my Moto GP can on my mechanic gave me an advisory saying it was a bit noisy, but i then pointed out the BSAU markings and he apologised because he'd already printed out the paperwork and said he didn't see the stamp, but the next year when i reminded him about it he gave it the all clear.

I find it difficult to understand how they question some bikes, when quite a few Harley's sound like 10 tractors?
A workmate has a Harley and when his bike is ticking over next to mine you wouldn't even know that my engine was running at all, it's extremely loud.

stevierst · « **Reply #13 on:** 17 December 2012, 05:44:25 pm »

Afaik it needs the baffle in for the BSAU to be legit. Most MOT stations will let them through, although VOSA will simply slap a prohibition notice on your bike if they catch you.

Deefer666 · « **Reply #14 on:** 18 December 2012, 07:53:35 am »

The FZS600 runs slightly rich as standard so you will not damage anything by running a straight through pipe, although you will not feel the true benefit unless you fit a freer flowing filter (K&N, BMC, etc etc ).

As for VOSA, their enforcement officers do not carry decimeters any more as a true reading cannot be achieved at the roadside so in order for them to slap a prohibition notice on your bike they would have to confiscate it and take it to one of their testing stations. They will not go to all this trouble for just a slightly noisy pipe.

If you have an excessively noisy pipe and make an arse of your self all thats likely to happen is that you get hassled and pulled by local plod and they will then looks for other reasons to give you a ticket (small/damaged plate, dark visor, vehicle defects etc etc)

Skippernick · « **Reply #15 on:** 18 December 2012, 01:20:03 pm »

Thanks for that guys.
I only fitted it because i wanted a nicer sounding exhaust and more importantly to save the standard one in the event of a fall etc,
so not really worried by performance. But i didn't want to damage the engine to gain that throatyer noise.

stevierst · « **Reply #16 on:** 18 December 2012, 03:57:15 pm »

Personally skippernick I'd keep the performance can on. I do believe that louder pipes definitely save lives. Makes a difference when filtering.

As for VOSA carrying the decimeters, well it was a long time ago when I got pulled at the bikesafe stop, so if you know any different Deeffer then that's fair enough. The rules do change on a regular basis.

As for cops stopping you, well they dont need a reason. And you can get a ticket on the spot for a defective silencer/not marked road legal amongst other 'offences'. A specially trained traffic cop can take your bike off the road for anything that's deemed unroadworthy. Bald tyre/brake pads/dodgy lights that sort of thing. It's a tricky, complicated set of rules that revolve around traffic law. Not really my cuppa.

Deefer666 · « **Reply #17 on:** 18 December 2012, 07:34:16 pm »

VOSA can no longer carry decimeters, they do however use them when they do their mass "safety stops" but these are not legally binding and any enforcement from them needs police assistance AND if you appeal 99% of the time those enforcements will not be pursued.

True that the police dont need an excuse to pull you but not many will do so JUST for a slightly noisy pipe, most of the time if you get stopped for that then it will be a combination of reasons I.E. Riding like a cock.

Every one of my bikes (And I have lots) has a noisy pipe including two of my bikes having home made pipes. I have never received a fine of ticket for noisy pipes

stevierst · « **Reply #18 on:** 18 December 2012, 08:21:37 pm »

I wouldn't be so flippant about it. I know plenty of traffic cops who are bike haters and stop them for a number of reasons including loud pipes. Thankfully I'm not one of them

I still believe in loud pipes save lives

slimwilly · « **Reply #19 on:** 19 December 2012, 07:19:02 am »

My Blue Flame can is bloody loud,rattles my ears with the baffle in,,,dont want to know how it is without the baffle.

Billy

Skippernick · « **Reply #20 on:** 21 December 2012, 07:17:07 pm »

And now the bloody collectors are blowing...

stevierst · « **Reply #21 on:** 21 December 2012, 07:40:30 pm »

Sounds like a new system is needed skipper. Mmmmmmmm stainless downpipes

Skippernick · « **Reply #22 on:** 21 December 2012, 10:25:18 pm »

mmm no money

stevierst · « **Reply #23 on:** 21 December 2012, 11:44:31 pm »

Quote from: Skippernick on 21 December 2012, 10:25:18 pm

mmm no money

Sell the wife/kids maybe??

Skippernick · « **Reply #24 on:** 22 December 2012, 12:18:55 pm »

Quote from: stevierst on 21 December 2012, 11:44:31 pm

Quote from: Skippernick on 21 December 2012, 10:25:18 pm
mmm no money
Sell the wife/kids maybe??

Stevierst - Thanks so much - we are in fact sitting next to him!!!

Nice to know we should be sold at Christmas for a bike part!! x

98 - 03 is the same engine so 98 downpipes will fit an 02 bike won't they?