Exhaust EVO

Hello,I have bought a racing exhaust "EVO" SIP for my vespa PX200.Does anybody know if I have change anything in my engine like the sparkplug or other thing in the carburator? the engine is original

thank you

Sergio

hi...

generally its the best thing to check your mainjet and increase a 5-10 %

for example you got an 118 mainjet in your 24 SI carb.

then increase to 120 - 123 and check the Spark Plug

 

 

Thank you very much