Vespa p125x no power

[sid10]

Hello all.

I have had my P125X for over a year now. And it has been going great until recently. We changed the piston to a mallossi mk2. Also upgraded the exshaust system aswell. My drama is that now when I go into 3rd then 4th there is no power or speed over 30mph. I have checked the air filter. Checked spark plug.

Any help or suggestions would be a great help

[citydaz]

A proper introduction would be a great help.

[sid10]

Afternoon Hello All

Name is Sid from the sunny Highlands.

Driving a 1990 P125X.

Sid M

[scooterg]

Welcome 🛵🛵🛵
now put the question in the technical section (don’t want to have all the remedies on this section)

[ironsloth]

Hi and welcome.