Specifications for early 125cc/160cc Victa 2 stroke mower engines

Bore:

• 125cc .............................. 53.975mm (2.125")
• 160cc .............................. 61.493mm (2.421")

Stoke ...................................... 53.975mm (2.125")
Piston taper:

• Bottom of Skirt -
• 125cc ......................... 53.848mm (2.120")
• 160cc ......................... 61.366mm (2.416")
• Top ring land -
• 125cc ......................... 53.721mm (2.115")
• 160cc ......................... 61.239mm (2.411")

Piston rings:

• Numer .............................................. 2
• Size -
• 125cc ...... 2.381mm x 53.975mm (0.093" x 2.125")
• 160cc ...... 2.381mm x 61.493mm (0.093" x 2.421")

Big end bearing type:

• Early models ......................... 15 steel rollers
• Late models ...................... Caged roller bearing

Little end type:

• 125cc .................................... Bronze bush
• 160cc -
• Early models ........................ Bronze bush
• Late models ............... Needle roller bearing

Connecting rod material ................ Hardened alloy steel
Crankpin material ...................... Hardened alloy steel
Crankshaft type ........................ Alloy steel forgings
                                    15 deg taper on drive end
                                 0.5 in B.S.F thread both ends
Crankshaft main bearings:

• Type .................................... Ball bearing
• Size -
• Magnet side ................................ 20mm
• Drive side (early models) .....20mm inner 17mm outer
• Drive side (late models) ..20mm inner 20mm L.D. outer

Crankcase oil seals:

• Drive side (early models) ........................... 17mm
• Timing side (early models) .......................... 20mm
• Both side (late models) ............................. 20mm

Ignition timing .............................. 3mm (1/8") btdc
Breaker point gap ............................ 0.50mm (0.020")
Spark plug gap .............................. 0.635mm (0.025")
Spark plug type ............ Contact your nearest Victa dealer
Fuel requirement ......... 2 stroke petrol-oil mixture (25:1)