How to decrease the exhaust sound of Vespa PX150

Check your fuel filter and regap your new plug. There usually 2 thousands of an inch off what there suppose to be. If that's 87 octane gas it could have water in it.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/anthony_e4f197748c31eabd

A lot of parts of Piaggio and Vespa you can find by www.goparts.eu

- the classic two stroke engine Vespas (since 1946 to ca. 1981) with gear shift at the handlebar have a direct drive to the rear wheel axle without any belt or chain.
- that is unique on scooters - but the newer models like ET4, LX, GTS etc. have now an automatic transmission with a variator belt.
direct drive on the rear axle

- NO belt or chain!!

There are many reasons that lead to no start. weak/dead battery, no fuel, blocking intake or exhaust, loose spark plug wire. You could check these parts and find the corresponding solutions. If you have interest in vespa sprint, feel free to chat with me.

To remove an exhaust manifold: 1. Locate your exhaust manifold, which differs in location depending the year, make and model of your car. It is usually located under the intake manifold. 2. Cool your car down completely. The bolts may break if the
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VAG diagnostic tools

It sounds like your floats sticking in the carb leaving it open all the time. take the carb to bits and clean it replacing all seals.

check your takn and clean your fuel and air filter and check the fuel line from the tank to the carb and blow it out, 1 of these should help.

sound like your starter motor has given up the ghost.

Cheers Dan

That's like asking for the Holy Grail ! All i can suggest is to pore through the web and absorb all the ideas and suggestions you can. Save up lots of money while you are doing so. You're gonna need it. Dismiss the cheaper tips and tricks and buy as good a quality exhaust, carb and cylinder kit as you can afford. All depends on what you expect to achieve and how much you've saved. Every scooterist who has tried to tune a Vespa has their own favourites and recommendations based on experience. But every one is different as is every Vespa so these vary wildly. If i was to give you one big piece of advice it's this ......................Keep two fingers on the clutch for when it siezes !!!