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Anyone know if a standard PX 125 will pass an MOT with a normal Simonini exhaust on? It's a bit loud but not performance enhancing as far as I know.

think it's basically down to the discretion of the MOT'er?

As above, the tester can fail the exhaust if the noise is 'clearly in excess', of what would normally be expected.

Wether it's a perormance enhancing exhaust or not is irrelevant, though if the tester sees 'not for road use' on it (as some aftermarket bike pipes do, not noticed it on any scooter ones), it will fail.

It should do....its a street legal pipe. But as has been said, tester's discretion.

Got one on mine, been through two MOT's no problem.

Glenk wrote:Got one on mine, been through two MOT's no problem.

Cheers mate. Best make sure I choose a tester who is cool with pipes. I'll take advice of local club. Think PD Autos in Outwood. Wakefield are good for us Scooter boys.

There is a legal dB limit for exhausts, but it varies dependant on the scooters year of manufacture. I'd expect a Simo to pass though assuming it's in good condition. Any exhaust stamped with the BS or Euro standard mark is an automatic pass as they are manufactured to be within the legal limit. If you want a really good argument with an MOT man, try turning up with an open mouthed carb... you get a hell of a lot of unsilenced noise back through those on any aircooled engine, but AFAIK it still isn't an MOT failure