Moped - AIS system

[McHattrick]

Hi, I am new here. Hoping to get some help with my sons moped.
He has a Rieju MRT 50 which is 3 years old. When I bought it I was assured it had not been de-restricted. However, having read a few other topics I am not so sure about that. I took it for MOT recently and it easily cruises on flat at 40mph, 45 downhill. I seem to have read that restricted bikes have a top speed of 30mph. Is this correct?
So that got me thinking. When I bought the bike the owner handed me a small item which he said had been removed from exhaust (to make it sound better!!). I have had a look at workshop manual and it seems that part is known as AIS System 'secondary air valve'.
Could the removal of this have de-restricted the bike?
I don't want my sons first venture into motorbike world to be illegal.
Any thoughts anybody?
Thanks
Mchattrick
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If it aint broke... fix 'til it is.

[Riejufixing]

[Nobby the Bastard]

Quite frankly, Mopeds are dangerously slow. Legally they shoukd only do 28 which makes them slower than traffic in a 30 limit.

Normally we woukd point out that bigger engines (big bore kit) etc makes the moped no longer a moped with all the insurqnce road and ax and license issues, but if you happened to buy one that was just derestricted, meh.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[McHattrick]

I got the manual from www.manualslib.com.

OK so it looks de-restricted. The AIS appears to put air back into exhaust to stop back-firing, so probably would sound better if removed, but can this be restricting engine too?

Nobby I kind of agree with you, less than 30 is dangerous, but so is a 16yo with a 45mph bike.. lol. Having said that, I had a funky moped and came to no harm.
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If it aint broke... fix 'til it is.

[Nobby the Bastard]

Putting air into the exhaust is a cunning way of reducing emissions. It could also result in a lot of popping becuase chucking fresh air where there's a lot of hot unburnt fuel wikk cause it to combust.

That valve doesn't sound like a restriction
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Teflon-Mike]

If a vehicle restricted to mph is 'dangerous' then no one should be allowed a push-bike or milk float or a mobility scooter!!!

What makes a 28mph moped 'dangerous' is the number-plate, and the 'idea' that because you are supposed to have done a CBT and have a driving licence, it aught to be as fast as any other vehicle you have to have a licence for.... which most riders dont... CBT aint a licence!!!

That 'idea' and the teen-age owners of them, are where the major 'danger' lies... go watch outside any chippy long enough or have a look on You-Tube to see for yourself!!! Treati9ng them as a big bmx to ride on the pavement when it suits, on the road when it suits, ignore road signs as suits, and generally think it all a great laugh... until they fall off or get caught.....

At least they have to wear a crash-hat, so they are slightly better protected than on the push-bike, and that number-plate means plod know where to send the summons......

Otherwise, they are a Mo-Ped... Mo for motorised, Ped for pedal cycle... the irony being that a half fit kid on a push bike can probably go a lot faster than one, and not have to display a number-plate or wear a crash hat or even complete a cycling proficiency course to do so!!!

Dont like Audi-coch's trying to give you an autobahn enema on the by-pass? DON'T GO THERE! Its pretty simple stuff... Goving some-one daft enough to go find trouble on a push-bike, something with an engine, that actually MIGHT just slow them down a bit and make them think twice about stuff, probably isn't such a daft idea... tuning the twits off a strimmer powered bath-tub on a pair of skate-board wheels... yeah... its not exactly a wonderful idea or teaching them very much, other than if you dont like the rules? Cheat!

May as well give them a fire-blade on the grounds of safety, and well, they aren't old enough to have licence, they cant get insurance, so why bother.... its all a great laugh.... innit?

40mph? I presume 'indicated'.. that's probably rather optimistic anyway....

Blanked off Air-Injection-Valve? Well, means that if they stick a sniffer up its chuff, its CO2 emmissions are likely above permitted.... but I very much doubt its done anything significant to the performance.

There's probably a lot bigger fish to fry in the greater scheme of things, and whether spoglet gets tugged for riding an illegally de-restricted moped, REALLY will depend upon how big a tit he is on the thing.... in which case restriction probably matters little...... his being a tit probably does.
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[andyscooter]

the air system was fitted to a lot of bikes and scoots just to get them through emissions testing when sold

my chinky scooter had one until I took it off

had nothing to do with the restriction

its purley a thing to be able to sell them in Europe
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[McHattrick]

Wow Tef, quite a rant.
Do you have issues with teens, push-bikes? Mopeds in particular?
I was introduced to biking on a moped when I was 16.Absolutely a brilliant introduction to biking. So I decided to get a moped for my daughter a few years ago when she was 16 and now my son.
I bought a Yam scooter for Jen and now a Rieju MRT 50 for Donald jnr. The MRT looks a bit like a supermoto, so much cooler for a teen boy than a scooter.
Of course the present restrictions on mopeds are rather severe, but severe for a reason.That suits me fine actually. I had a bad accident when I was 18 and dont want that to happen to my son.
So, I don't know what teens you know, but my son and his friends are all very mature, intelligent youngsters. I have no worries about him thrashing along the pavement scaring old grannies. But I do worry about the condition of his bike. Which is why I came to the Workshop for advice. Not for a lecture on whether mopeds/teens should be allowed on the road.
Anyway, you did eventually get around to answering my query about AIS, so thank you for that. Perhaps you can raise your worries and concerns about mopeds in a more apropriate section. General bike chat maybe.
Many thanks for your feedback.

Andyscooter thanks for answer. Its what I got told when I bought the bike but just wanted confirmation.
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If it aint broke... fix 'til it is.

[Riejufixing]

[McHattrick]

I am sure Tefs post is very tongue in cheek but there may be some underlying issues there also... lol

And I wasn't suggesting my son is a typical teen. He is 16 going on 36... puts me to shame with his sensible attitude. Thought maybe biking will snap him out of it.

I was really surprised how fast this 'moped' was. My wife followed me in car for MOT and it is defo 40+.
Not sure whats been done, and not sure I want to re-restrict it. As Tef says, 28mph is just as dangerous.
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If it aint broke... fix 'til it is.

[grr666]

When I was 16 I'd have handed over a bollock to make my 50cc ped a real world 15mph faster. I'd leave it be
and tell them to not razz it around at flat out when the old bill are clearly present and visible and you should have no
worries. I had a C50 cub as a byklaff pitbike (which my parents knew sweet FA about) when I was a few years younger
than that, and that did 40 something.
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