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bigdom86
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PostPosted: 12:15 - 21 May 2019    Post subject: MOT - exhaust noise Reply with quote

whats the current guidance on MOTs and exhausts? obviously if you have an exhaust with big letters FOR RACE USE ONLY or NOT FOR ROAD USE it will fail, but if you have an exhaust with no markings at all but is obviously too loud what is the general consensus, do they check dB at MOT at various RPM or just let it idle and decide if they think it will pass or not?
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Minty
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PostPosted: 13:27 - 21 May 2019    Post subject: Reply with quote

They use a device called their ears and their opinion. As to"not for road use" mine has that on it with no issues. Some years I get an advisory for noise, sometimes I don't and it is the same tester every year.
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redeem ouzzer
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PostPosted: 13:31 - 21 May 2019    Post subject: Reply with quote

I think the wording is something along the lines of "in the opinion of the tester the machine is not louder than a similar machine with the manufacturer's original exhaust system".

Basically tester's discretion although i wouldn't take a bike for test with an endcan stampled "not for road use".
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owl
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PostPosted: 13:34 - 21 May 2019    Post subject: Reply with quote

A silencer in such condition, or of such a type, that the noise emitted from the vehicle is clearly unreasonably above the level expected from a similar vehicle with a standard silencer in average condition
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blurredman
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PostPosted: 14:15 - 21 May 2019    Post subject: Reply with quote

My tester has to use hearing aides.
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Riejufixing
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PostPosted: 15:09 - 21 May 2019    Post subject: Re: MOT - exhaust noise Reply with quote

bigdom86 wrote:
obviously if you have an exhaust with big letters FOR RACE USE ONLY or NOT FOR ROAD USE it will fail


Grind the letters off or stick on a plain plate using RTV silicone.


bigdom86 wrote:
but if you have an exhaust with no markings at all but is obviously too loud what is the general consensus, do they check dB at MOT at various RPM or just let it idle and decide if they think it will pass or not?


They will run it and listen to it and look at each other doubtfully, then blip the throttle a few times. Shaking heads is fail, shrugging shoulders is pass.
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MCN
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PostPosted: 17:43 - 21 May 2019    Post subject: Reply with quote

Blurredman wrote:
My tester has to use hearing aides.



WHAT?

OP. it is entirely at the discretion of the tester.

A chap I use will pass with anything on it.

His logic being he passes and the owner fits a race-can as soon as the test is passed.
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Blah blah
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PostPosted: 18:58 - 21 May 2019    Post subject: Reply with quote

I have an advisory every year due to a 'noisy exhaust' and looking at the MoT history, the only time it failed was the time it said 'not for road use' on it (it later passed with an advisory...)
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Bhud
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PostPosted: 19:17 - 21 May 2019    Post subject: Reply with quote

If you've got a straight-through pipe you should stock s baffle of some sort, even if it's just one of those "dB killer" things on Ebay, to get it through.

Some bikes are just absurdly loud and everyone expects them to be absurdly loud, which means the MOT guy will probably allow them. However, such bikes can be made obnoxiously loud. If you do own such a Harley, I believe other Harley owners would be best placed on how to pack your exhaust with wire wool that will last for an hour or so. They can be coy about such tricks, I believe. Socially irresponsible perhaps, but that's how yhe world rolls.

A blowing exhaust on any bike sounds obvious and bad, and you should expect a fail if you put one through the MOT. On aftermarket silencers (not complete aftermarket exhausts) I believe you should be careful if the bike was a single or a Jap four. Factory systems on these before they all rotted and rusted were really effective at keeping the noise down. The Japanese fours were quiet bikes at low revs because of those standard heavy factory silencers. So a cheap poorly muffled end can on one of those could result in a fail.
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hellkat
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PostPosted: 19:17 - 21 May 2019    Post subject: Reply with quote

My Sportster passed with an advisory on noisy exhaust.
Cool
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Grubscrew
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PostPosted: 20:10 - 21 May 2019    Post subject: Reply with quote

As a related comment to noisy exhausts.....if you happens to take your noisy exhausted bike to Austria, the police will stop you and stop you from riding by impounding the bike.......it’s a long walk back home.!
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almostthere
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PostPosted: 20:45 - 21 May 2019    Post subject: Reply with quote

took my Daytona for a test on Saturday they never even started it just pushed it in and back out!
sailed through the mot even with a Triumph race can on Thumbs Up
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F18
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PostPosted: 23:51 - 21 May 2019    Post subject: Reply with quote

My tester (like I own him ...) says okay no promlemo, but I don't take the piss and have been known to put the baffles in for the day.
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ThatDippyTwat
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PostPosted: 06:55 - 22 May 2019    Post subject: Reply with quote

The VFR that I bought that came with an unbaffled Delkevic passed with no advisories. Not dodgy, it's a safety test, not a noise test, and he will (rightly) fail you if you have lights out etc.

Another (notorious) tester told me outright he would fail it for my, now baffled, Delkevic when I was in there to get some HT lead last week.
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winz
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PostPosted: 07:55 - 22 May 2019    Post subject: Reply with quote

My Blackbird used to get an advisory with a loud exhaust. I wouldn't even bother trying to MOT a bike with a not for road use stamp though.
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Fizzoid
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PostPosted: 08:50 - 22 May 2019    Post subject: Reply with quote

Minty wrote:
Some years I get an advisory for noise, sometimes I don't and it is the same tester every year.


Same, guess it all depends on what mood he's in
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Feasty
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PostPosted: 10:16 - 22 May 2019    Post subject: Reply with quote

Bit different to exhausts, but I was a bit peeved when my F650 was MOT'd last year and got an advisory for a slightly bent handlebar... The last 7-8 years of previous MOT's all passed and had no advisories whatsoever.

Looking at the state of the bike, which is pretty good, I'd say the handlebars have been like this for a fair few years now - no signs of the bike having a recent drop. I've had it for a year now and not dropped it either.

The guy also said they aren't bent much and don't really need replacing unless I'm noticing it - well I didn't chuffing notice it at all until he mentioned it! And why put it as an advisory if it's hardly noticeable? The only thing that does is give a buyer an excuse to kick down the price if/when I come to sell it... Rolling Eyes
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Shaft
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PostPosted: 19:44 - 22 May 2019    Post subject: Reply with quote

Feasty wrote:
Bit different to exhausts, but I was a bit peeved when my F650 was MOT'd last year and got an advisory for a slightly bent handlebar... The last 7-8 years of previous MOT's all passed and had no advisories whatsoever.

Looking at the state of the bike, which is pretty good, I'd say the handlebars have been like this for a fair few years now - no signs of the bike having a recent drop. I've had it for a year now and not dropped it either.

The guy also said they aren't bent much and don't really need replacing unless I'm noticing it - well I didn't chuffing notice it at all until he mentioned it! And why put it as an advisory if it's hardly noticeable? The only thing that does is give a buyer an excuse to kick down the price if/when I come to sell it... Rolling Eyes


It also means that if DVSA Derek is lurking in the shadows and decides to spot check your bike as you leave, the tester can't be hauled over the coals for missing something he should've noted.

They've been having a major clamp down on testing standards in the last 12 months, with pretty spectacular results (can't remember the exact figures, but something like 5 times as many testers have been suspended as were in the last 5 years put together) so there will be a fair few testers getting ultra picky, especially if they've already been visited (they tend to get visited again, to make sure you've learned your lesson) or they've got wind that the gestapo are in the area.
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