PIAGGIO Vespa GTS 300 HPE 2019 Owner's Manual page 83

Faulty coil. Due to the presence of
high voltage, this check should
only be carried out by an expert
LACK OF COMPRESSION
Loose spark plug
Cylinder head loose, piston gas
rings worn
Valve stuck
HIGH FUEL CONSUMPTION AND BAD
PERFORMANCE
Air filter blocked or dirty
INSUFFICIENT BRAKING
Disc greasiness. Worn brake pads.
Faulty braking system. Air in the
front and rear brake circuits
Contact an Authorised Service
Centre.
Screw in the spark plug tightly
Contact an Authorised Service
Centre.
Contact an Authorised Service
Centre.
Contact an Authorised Service
Centre.
Contact an Authorised Service
Centre.
83