Hi, I have just got a new UK 08 4rt and was wondering about the exhaust restrictors ...

Will the internal ones have been removed on PDI ?

If not, do they need removing or leave well alone ?

I have removed the external restrictor on the end of the silencer, should I have done this ?

Thanks for your help ....

why not just ask the person that did the pdi?

hi, check that the one in the front pipe where it bolts to cylinder head is removed, and yes it is best to take the rear silencer one of as they sound awesome ! good choice of bike mate

The difference between sounding awesome and being obnoxious is a fine line to tread.

Spencer

The difference between sounding awesome and being obnoxious is a fine line to tread.

Correct. Im sure the general public and those that might otherwise let us use thier land also think the 4rt 'sounds awesome' without restrictors. NOT.

Ill give you an example. Close to where I live is a small derelict sand quarry within half mile of a housing estate. Trial riders and motocrossers on two strokes have practiced in there for years without complaint - basically because the sound of the bikes never carried far enough to disturb anyone.

With the popularity of the four stroke bikes, the sound is horrendous and carries into the estate - net result being that the residents are ringing the cops and council every five minutes to complain. As a result of this it is now nigh on impossible to ride there without hassle and the landowner is considering levelling it.

Imagine the same scenario in a national park where rambling hiker types can hear the bikes for miles around - not good. I know of at least one practice area where only the 4rt is not welcomed.

Sorry to hijack the thread - but we ignore this at our peril - leave the restrictors in.

If the bike is standard and your keeping it that way it is best to leave all the restrictors in place.

If the bike is standard and your keeping it that way it is best to leave all the restrictors in place.

And even then it's louder than is desirable.

Hi, thanks for your replies. I have spoken to the dealer where I got the bike from and when it was PDI'd they only removed a restrictor in

the throttle body and sniped a wire. They advised me to leave the exhaust restrictors alone, as their team rider rode the SSDT with them in and

to be honest if it's good enough for someone at that level it's certainly good enough for me ......

P.S The 08 4rt is quieter than the older 4rt's I have heard.

Glad to hear yo left the rear restrictors in. Above posts make sensible comments about the noise polution levels, why put practice areas at risk just because it sounds better loud & the performance gain is not tha beneficial to most clubmen, Leave the 4 strokes standard apart from sensible restrictions that don't increase noise (in my opinion anyway).

I meant to say sensible de-ristrictions

Correct. Im sure the general public and those that might otherwise let us use thier land also think the 4rt 'sounds awesome' without restrictors. NOT.

Ill give you an example. Close to where I live is a small derelict sand quarry within half mile of a housing estate. Trial riders and motocrossers on two strokes have practiced in there for years without complaint - basically because the sound of the bikes never carried far enough to disturb anyone.

With the popularity of the four stroke bikes, the sound is horrendous and carries into the estate - net result being that the residents are ringing the cops and council every five minutes to complain. As a result of this it is now nigh on impossible to ride there without hassle and the landowner is considering levelling it.

Imagine the same scenario in a national park where rambling hiker types can hear the bikes for miles around - not good. I know of at least one practice area where only the 4rt is not welcomed.

Sorry to hijack the thread - but we ignore this at our peril - leave the restrictors in.

I hate this sort of do-gooder post.

The guy asked about the restrictors in his exhaust.. he didnt say "please show me the light on my responsibility to humanity". Its about choice dude, if he wanted a debate about the pro's and cons of noisy bikes, he'd start a post on the that subject.

Rather than "hi-jack the thread" why dont you start up your own thread and tell us all how we can avoid upsetting the neighbourhood and we can chose to read it or not read it.... and avoid preaching on other peoples posts?

FFS...

Jza

Let me guess... you removed your baffles?

Just joking but I have to agree with the meister guy, it's a point worth making in this type of thread as it really has a bearing on the tolerance of people to let us use their land to practice/compete.

Whether you like it or not 4 stroke noise carries further than 2 stroke so you really shouldn't be making it louder. To ignore this is selfish and doesn't support trials as a whole.

Just my opinion.

I have had at least two restrictors removed by my dealer, and the one in the ehust he did was absolutely essential, and made no difference to the noise.

the one he didn't remove did and thats why he left it in.

A reasponsible dealer and someone who knows these bikes well is imperative, my guess is your dealer knows jack **** about 4rt's.

mail me off board and I will give you a number to call.

I am on HOLIDAY so it might not be instant.

On balance, the tread was not "hi-jacked", the pros and cons of modifying the exhaust system on the bike were given in a fair way. The issue of noise is very real in motorsports and may not have occurred to darrensn when started this topic, but he appears to have given thought to all of the replies posted, and done what the majority of us club riders would have done.

Spencer

I hate this sort of do-gooder post.

The guy asked about the restrictors in his exhaust.. he didnt say "please show me the light on my responsibility to humanity". Its about choice dude, if he wanted a debate about the pro's and cons of noisy bikes, he'd start a post on the that subject.

Rather than "hi-jack the thread" why dont you start up your own thread and tell us all how we can avoid upsetting the neighbourhood and we can chose to read it or not read it.... and avoid preaching on other peoples posts?

FFS... sad.gif

Jza

Let me guess 'dude' you live in central Arizona right? (or somewhere just as remote)

Noise is less of an issue there maybe than here in crowded blighty where our sport is genuinely at risk. It is about choice - an important one - use a noisy exhaust and put another nail in the coffin of off road motorcycling in the uk or go quiet and give us a few more years enjoying our sport.

Do-gooder post - hahahahahaha -