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How to identify a road legal slip on exhaust
http://www.trf.org.uk/forum/viewtopic.php?f=37&t=23218
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Author:  mikeringrose [ Sun Jan 22, 2017 3:25 pm ]
Post subject:  How to identify a road legal slip on exhaust

Hi,

I am new to the TRF and have just acquired a 2014 Honda CRF 250L with a Termi slip on pipe. I wonder can anyone tell me is this pipe road legal? It looks great but unfortunately is it noisy. ID marks are as follows: E11 0866 6.

Your help is appreciated.

Regards
Mike

Author:  smokinrider [ Sun Jan 22, 2017 7:23 pm ]
Post subject:  Re: How to identify a road legal slip on exhaust

if its e stamped I guess its legal. see if there is a slip in baffle you can get for it.

Author:  Skunkyd [ Mon Jan 23, 2017 12:13 pm ]
Post subject:  Re: How to identify a road legal slip on exhaust

Alternatively you can buy a decal off eBay to make it road legal, or if the original decal has been damaged :)

Author:  smokinrider [ Mon Jan 23, 2017 1:40 pm ]
Post subject:  Re: How to identify a road legal slip on exhaust

if its already e marked and e11 means a UK standard, why would he want to buy another sticker???

Author:  2 Yams [ Mon Jan 23, 2017 3:17 pm ]
Post subject:  Re: How to identify a road legal slip on exhaust

smokinrider wrote:
if its already e marked and e11 means a UK standard, why would he want to buy another sticker???


To be sure to be sure ;) :D

Author:  Richard Simpson [ Mon Jan 23, 2017 3:40 pm ]
Post subject:  Re: How to identify a road legal slip on exhaust

Frankly, no one who hears you will worry about the sticker.

The real questions to ask are.

1) Is it too loud?

the answer is probably yes, or you wouldn't have asked.

2) What can I do to make it quieter?

Well the first thing to do is make sure the baffles are intact...some exhausts have removable baffles. If it's an absorption type silencer then it may need repacking.

If neither of those applies then it probably needs replacing with something more suitable. Outright power isn't a priority for trail riding, but being quiet is.

Author:  Hugh Cleary [ Mon Jan 23, 2017 6:00 pm ]
Post subject:  Re: How to identify a road legal slip on exhaust

Greetings,

I do not know the product but you could contact the UK distributor for advice;

http://www.motorcycle-exhausts.co.uk

In my experience simply being loud does not equate to either torque nor bhp, indeed in many cases any improvement has only ever been in a narrow rev band and not across the performance range of the engine. Exhaust back pressure is required for efficient breathing of the engine, the exhaust gas pressure acts as waves and they need to be timed to produce a negative wave as the exhaust valve/port opens and closes.

Quiet is best I think, especially for our use.

TTFN

Hugh.

Author:  smokinrider [ Mon Jan 23, 2017 9:38 pm ]
Post subject:  Re: How to identify a road legal slip on exhaust

Richard Simpson wrote:
Outright power isn't a priority for trail riding, but being quiet is.



Outright power isn't a phrase I'd ever associate with a CRF250L regardless of its exhaust!


Sent from my iPhone using Tapatalk

Author:  Richard Simpson [ Tue Jan 24, 2017 12:59 pm ]
Post subject:  Re: How to identify a road legal slip on exhaust

Hugh Cleary wrote:
Greetings,

I do not know the product but you could contact the UK distributor for advice;

http://www.motorcycle-exhausts.co.uk

In my experience simply being loud does not equate to either torque nor bhp, indeed in many cases any improvement has only ever been in a narrow rev band and not across the performance range of the engine. Exhaust back pressure is required for efficient breathing of the engine, the exhaust gas pressure acts as waves and they need to be timed to produce a negative wave as the exhaust valve/port opens and closes.

Quiet is best I think, especially for our use.

TTFN

Hugh.


All very true, Hugh.

Us very old people will remember in the days when road-racers were big singles with megaphone exhausts. These gave good top-end power, but killed the engine's bottom-end torque. Canny riders actually used to stick their boot into the end of the exhaust when exiting a corner to boost the bottom-end power. It was a bit like an EXUP valve!

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