ADLY              
All 50cc Auto Scooters P310 P310A P310B P310C P310D P310E P310F
 
APRILIA              
All 50cc Auto Scooters Horizontal Cyl. P310 P310A P310B P310C P310D P310E P310F
All Geared 50cc Motorcycles P284 P284A P284B P284C P284D P284E P284F
 
ATALA              
Hacker, Skeggia AC/LC P292 P292A P292B P292C P292D    
Carosello P310 P310A P310B P310C P310D P310E P310F
 
BENELLI              
All 50cc Auto Scooters P310 P310A P310B P310C P310D P310E P310F
 
BETA              
All 50cc Auto Scooters P310 P310A P310B P310C P310D P310E P310F
 
CAGIVA              
Mito 50 P226S <<< See Note          
Note: Original cylinders are plated and cannot be bored.    
Metrakit replacement cylinder kits (re-borable) are available.
DAELIM              
Message P235 P235A P235B P235C P235D    
 
DERBI              
Atlantis, Hunter, Paddock, Vamos / FL P292 P292A P292B P292C P292D    
GPR50, Senda, Senda R, Supermotard P226S <<< See Note          
Note: Original cylinders are plated and cannot be bored.    
Metrakit replacement cylinder kits (re-borable) are available.
GILERA              
All 50cc Auto Scooter Motors P304 P304A P304B P304C P304D P304E P304F
 
HONDA              
Bali, SFX, SH50 New, Sky, X8R-S / X P235 P235A P235B P235C P235D    
 
HUSQVARNA              
WRS P292 P292A P292B P292C P292D    
 
ITALJET              
Formula, Torpedo, Velocifero P292 P292A P292B P292C P292D    
Dragster 50 P310 P310A P310B P310C P310D P310E P310F
 
LEM              
All 50cc Auto Motors P310 P310A P310B P310C P310D P310E P310F
 
MALAGUTI              
All 50cc Auto Scooters P310 P310A P310B P310C P310D P310E P310F
 
MBK              
All 50cc Auto Scooters P310 P310A P310B P310C P310D P310E P310F
 
MINARELLI              
All 50cc Auto Scooter Motors P310 P310A P310B P310C P310D P310E P310F
AM-6 Motor (Iron Cylinder) P284 P284A P284B P284C P284D P284E P284F
 
MOTORHISPANIA              
All Geared 50cc Motorcycles P284 P284A P284B P284C P284D P284E P284F
 
PEUGEOT              
All 50cc Auto Scooters (Not ST Rapido) P265A P265B P265C P265D P265E P265F  
Note 1: Original cylinders are plated and cannot be bored.
Metrakit replacement cylinder kits (re-borable) are available.
Note 2: Oversize pistons P265B/C/D/E/F are "wear compensation" pistons for use in original plated bore.
Note 2: Oversize pistons P265B/C/D/E/F are "wear compensation" pistons for use in original plated bore.
PIAGGIO
All 50cc Auto Scooter Motors P304 P304A P304B P304C P304D P304E P304F
 
RIEJU              
All Geared 50cc Motorcycles P284 P284A P284B P284C P284D P284E P284F
 
SUZUKI              
Address, Address R, AP50, Katana AC P292 P292A P292B P292C P292D    
Katana LC, Zillion P208 P208A P208B P208C P208D    
 
VESPA              
ET2 P304 P304A P304B P304C P304D P304E P304F
 
YAMAHA              
All 50cc Auto Scooters P310 P310A P310B P310C P310D P310E P310F