mealexme Posted August 20, 2012 Posted August 20, 2012 Theoretically, what would a "performance part" exhaust do to a restricted bike? Would it actually increase the power? Would it decrease the power due to lack of back pressure (I never really understood back pressure tbh) Or would it do so little to the performance that you wouldn't notice?More importantly, would it damage it? I dont see any reason it would, but I heard from a mate (I know, I know) that it would damage the bike Quote
Stu Posted August 20, 2012 Posted August 20, 2012 Won't damage itYou you won't see any gain an exhaust helps it breath easier but the inlet is restricted so it won't help it breath In reality a standard exhaust on a restricted bike is already able to breath as best it can given the amount of airflow you have Hope that helps Quote
mealexme Posted August 20, 2012 Author Posted August 20, 2012 Won't damage itYou you won't see any gain an exhaust helps it breath easier but the inlet is restricted so it won't help it breath In reality a standard exhaust on a restricted bike is already able to breath as best it can given the amount of airflow you have Hope that helps Yea, it does. I dont want it for the performance because the plan is to stay restricted for another year anyway, its more for the look and sound at the moment. I just dont want to damage anything in the process! Quote
Stu Posted August 20, 2012 Posted August 20, 2012 If that's the case go for it you have nothing to loose really Quote
mealexme Posted August 20, 2012 Author Posted August 20, 2012 If that's the case go for it you have nothing to loose reallyWill do, and will put pics up. Had to make up some bull excuse for my mum to why I am spending money on a new exhaust, but it all depends on whether I can get a F*%$ING bolt out! Its rusted in there like a mother f*cker! Quote
Boothy Posted August 21, 2012 Posted August 21, 2012 Let me guess... the bolt that connects half way up the link pipe. I gave up with it and got the dealer to do it when it went in for Valve clearances. Oh and if you have not got a exhaust yet... the Fuel 350mm sounds pretty good. Quote
Joeman Posted August 21, 2012 Posted August 21, 2012 Where do you stand legally with regards to fitting a performance pipe to a resticted bike if your licence requires the bike to be restricted? As already stated, i doubt it would actually give you any more performance, but try explaining that to a grumpy traffic cop, who pulls you over for a spot check, notices the performance pipe, then insists on taking the bike away to be tested to prove it is indeed resticted.... Quote
Stu Posted August 21, 2012 Posted August 21, 2012 Like I say its restricted on the inlet so no matter what you do the the exhaust you won't get more airflow as the restrictor's won't allow it As for the plod they would have to be very keen! Quote
Joeman Posted August 21, 2012 Posted August 21, 2012 Like I say its restricted on the inlet so no matter what you do the the exhaust you won't get more airflow as the restrictor's won't allow it As for the plod they would have to be very keen! yes, restriction is on the intake side, so a change of exhaust wont improve performance.However i was watching an episode of "Emergency Bikers" ( or some other Reality TV show ) where the cops pulled over some scooter riders and took their bikes away to be tested to ensure they were restricted and learner legal. If the cops see the exhaust has been replaced with a 'performance' pipe, its not unimaginable that they might also consider that the bike owner has also removed the restrictions... The cop's perfectly logical thought process might be "Why fit a performance exhaust to a resticted bike??" as thats what 99% of 50cc scooter riders do - de-restict and fit performance exhaust... Quote
Stu Posted August 21, 2012 Posted August 21, 2012 Because scooters are restricted in the exhaust so replacing it removes the restriction Quote
Joeman Posted August 21, 2012 Posted August 21, 2012 Because scooters are restricted in the exhaust so replacing it removes the restrictionyes i know.. I derestriced enough of them myself as a kid!Imagine a conversation like this...Cop: Nice performance exhaust you have fitted there son, but i see you have a resticted licence.Rider: yes officer, but the pipe dosnt make any difference to performance, it just looks and sounds better offficer.Cop: Are you sure the bike is still legal to ride on your licence and you havent de-restricted it?Rider: yes officer, still legal, and not de-restricted Cop: Hmmm well i dont know why you would spend £xxx on a Performance pipe for a de-resticted bike if it doesnt add any performance, so i'd like to take the bike away for it to be tested to ensure its still legal to ride on your restricted licence.Rider: I'll start walking home then shall i.... Quote
murp24 Posted August 21, 2012 Posted August 21, 2012 "Emergency Bikers" OTHER TV SHOWS ARE AVAILABLE. I watch that sometimes aswell, i have seen a few episodes regarding posible de-restricted bikes been taken away because they had fitted new parts. But to be fair the youths dont help them selves hairing around and getting pulled over alowing the cops to take a better look at the bike and noticing more then resulting in seazing the bike. Quote
murp24 Posted August 21, 2012 Posted August 21, 2012 If that's the case go for it you have nothing to loose reallyWill do, and will put pics up. Had to make up some bull excuse for my mum to why I am spending money on a new exhaust, but it all depends on whether I can get a F*%$ING bolt out! Its rusted in there like a mother f*cker! Hit it with a hammer! No joking, if all else fails grind it off Quote
davefly76 Posted August 21, 2012 Posted August 21, 2012 Because scooters are restricted in the exhaust so replacing it removes the restriction Cop: so i'd like to take the bike away for it to be tested to ensure its still legal to ride on your restricted licence.Rider: I'll start walking home then shall i.... Can they do that? I thought the only thing they could do, providing the bike is taxed, MOT'd and insured is issue you with a notice to get it checked/rectified at an MOT station Quote
Joeman Posted August 21, 2012 Posted August 21, 2012 Because scooters are restricted in the exhaust so replacing it removes the restriction Cop: so i'd like to take the bike away for it to be tested to ensure its still legal to ride on your restricted licence.Rider: I'll start walking home then shall i.... Can they do that? I thought the only thing they could do, providing the bike is taxed, MOT'd and insured is issue you with a notice to get it checked/rectified at an MOT station if they have reason to believe you're riding the bike unlicenced, then yes, they can take it away. So if they think it might be de-restricted and you're riding on a restricted licence, they're not gonna let you ride it home!! Quote
Boothy Posted August 21, 2012 Posted August 21, 2012 I've watched an episode of Emergency Bikers where a 19 year old who had his license less than a year got pulled over because the cop had to do 140 just to keep up. Didn't even mention the restriction. If you're that worried about what it will do... stick it on a dyno, it won't be the full 33bhp even before the exhaust anyway and its only £30 to check. Quote
Stu Posted August 21, 2012 Posted August 21, 2012 If a copper knows that you have a none standard system that makes more power just by looking as you ride past then he will know how its restricted Let's get realistic a copper is not going pull you because it looks like you have a performance exhaust I mean the chance of that happening is a million to one And even if you do get pulled for whatever reason you would still be legal and so what if he wanted to test it let him its their time and their money Quote
murp24 Posted August 21, 2012 Posted August 21, 2012 +1 on thatalso if they believe that it is unrestricted and there for are unlicenced to ride the bike/scooter etc then you will be breaching the terms of your insurance as you have modified your vehicle and there for making it illegal for them to ride it, insurance may be terminated. Quote
davefly76 Posted August 21, 2012 Posted August 21, 2012 Possibly yes, but how many on here that have a non-standard exhaust have told their insurance company? And of all the people that haven't, how many have been pulled over?The police aren't going to waste their time pulling over every bike that has a noisy exhaust. They might however pull you over for speeding or dangerous/reckless riding and go over the bike with a fine toothed comb noting the noisy can, small number plate, lack of rear reflector and your tinted visor, and then they might (in the loosest possible term) want to have your bike put on a dyno to check that it doesn't produce more than 33bhp! The odds are pretty low imo. Quote
mealexme Posted August 22, 2012 Author Posted August 22, 2012 Not worried about the power tbh, just wanted to know if it would make any difference. Even if it did, I presume it would only be a couple of bhp, and over the years (8yo bike) it has probably lost a couple of bhp, so it would work out roughly the same, and even if its at 34bhp after the "upgrade", although illegal I like to think that a police officer/judge wouldnt take my licence away etc for being a couple of bhp over the limit. Although I could be wrong.Also, thanks for the suggestion pinky but already got one being made Quote
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