Big Bore Kits

(A) Honda CB900/1100F DOHC 1300cc Big Bore Kit

(Rods, Head Gasket, Sleeves, B/E & Piston Kit)

1300cc big bore kit to fit to CB900F and CB1100F CB Boldors, 78mm prolite pistons, H beam rods, sleeves, conrod bearings and head gasket.

Conrods

• 122 mm c/c off set 1.5mm
• 16 mm little end bush
• 4340 Forged Chrome moly steel
• Shot peened
• H Beam Design
• Supplied With 20,000 H/Tensile Bolts
• 16 mm Bronze Bush little end
• oil squirters

Pistons

Forged pistons,78 mm prolite 16mm pins, super light, one compression ring, these piston (Forged) can handle a lot more than the Hypertectic’s. Better suited to race conditions.

Sleeves

Premium grade cast iron for the job

Head Gasket

Copper .9mm thick

Instructions on Machining

Machining available, we can resleeve your barrel, bore the top case to suit O/S sleeves, valve service head or big valve and porting work, lighten crank deball and clean and balance or we can do the whole engine.

Machining involved to barrel and top case

Also Available

Crank upgrade see pictures in store, 4kg lighter, polished, knife edged, modern design, oil gallery’s cleaned and re-balled and balanced.

(B) Honda CB900/1100F DOHC 1300cc Big Bore Kit

(Rods, Head Gasket, Sleeves, B/E & Piston Kit)

1300cc big bore kit to fit to CB900F and CB1100F CB Boldors, 78mm prolite pistons, H beam rods, sleeves, conrod bearings and head gasket.

Conrods

• 122 mm c/c off set 1.5mm
• 16 mm little end bush
• 4340 Forged Chrome moly steel
• Shot peened
• H Beam Design
• Supplied With 20,000 H/Tensile Bolts
• 16 mm Bronze Bush little end
• oil squirters

Pistons

Hypertectic pistons, 78mm prolite 16mm pins, super light, one compression ring, suited for street conditions.

Sleeves

Premium grade cast iron for the job

Head Gasket

Copper .9mm thick

Instructions on Machining

Machining available, we can resleeve your barrel, bore the top case to suit O/S sleeves, valve service head or big valve and porting work, lighten crank deball and clean and balance or we can do the whole engine.

Machining involved to barrel and top case.

Also Available

Crank upgrade see pictures in store, 4kg lighter, polished, knife edged, modern design, oil gallery’s cleaned and re-balled and balanced.

Honda CB1100F DOHC 1123cc Big Bore Kit

1123cc big bore kit to fit to CB1100F Boldors, 72mm pistons, H beam rods, conrod bearings and head gasket.

Conrods

• 117 mm c/c H beam rods
• 17mm little end bush
• 4340 Forged Chrome moly steel
• Shot peened
• H Beam Design
• Supplied With 20,000 H/Tensile Bolts
• 17 mm Bronze Bush little end
• oil squirters
• Big end bearings

Pistons

• Hypoeutectic pistons, 72mm 17mm pins

Head Gasket

• Graphite

Instructions on Machining

Machining available, we can re-sleeve your barrel, bore the top case to suit O/S sleeves, valve service head or big valve and porting work, lighten crank deball and clean and balance or we can do the whole engine.

Machining involved to barrel and top case.

Also Available

Crank upgrade see pictures in store, 4kg lighter, polished, knife-edged, modern design, oil gallery’s cleaned, re-balled, and balanced.

Honda CB900F DOHC 1123cc Big Bore Kit

1123cc big bore kit to fit to CB900F Boldors, 72mm pistons, H beam rods, sleeves, conrod bearings and head gasket.

Conrods

• 117 mm c/c H beam rods
• 17mm little end bush
• 4340 Forged Chrome moly steel
• Shot peened
• H Beam Design
• Supplied With 20,000 H/Tensile Bolts
• 17 mm Bronze Bush little end
• oil squirters
• Big end bearings

Pistons

• Hypoeutectic pistons, 72mm 17mm pins

Sleeves

• Premium grade cast iron for the job

Head Gasket

• Graphite

Instructions on Machining

Machining available, we can re-sleeve your barrel, bore the top case to suit O/S sleeves, valve service head or big valve and porting work, lighten crank deball and clean and balance or we can do the whole engine.

Machining involved to barrel and top case.

Also Available

Crank upgrade see pictures in store, 4kg lighter, polished, knife-edged, modern design, oil gallery’s cleaned, re-balled, and balanced.

Honda CBX1000 6 cyl DOHC 1370cc Big Bore Kit

(Rods, Head Gasket, Sleeves, B/E & Piston Kit)

1370cc big bore kit to fit to Honda CBX 1000 6 Cylinder 74mm Hypertectic pistons, H beam rods, sleeves, conrod bearings and head gasket.

Conrods

• 106 mm c/c
• 19 mm little end bush
• 4340 Forged Chrome moly steel
• Shot peened
• H Beam Design
• Supplied With 20,000 H/Tensile Bolts
• 19 mm Bronze Bush little end
• oil squirters

Pistons

Hypertectic pistons, 74mm, 19mm pins, suited for street conditions, forged are available for forced induction and race.

Sleeves

Premium grade cast iron for the job

Head Gasket

Copper .9mm thick

Instructions on Machining

Machining available, we can resleeve your barrel, bore the top case to suit O/S sleeves, valve service head or big valve and porting work, lighten crank deball and clean and balance or we can do the whole engine.

Machining involved to barrel and top case.

Also Available

Crank upgrade see pictures in store, 4kg lighter, polished, knife edged, modern design, oil gallery’s cleaned and re-balled and balanced.

Honda CB750 970cc Big Bore Kit

(Rods, Head Gasket, Sleeves, B/E & Piston Kit)

970cc big bore kit to fit to CB750 SOHC 1969 – 1978, 70mm pistons, H beam rods, sleeves, conrod bearings and head gasket.

Conrods

• 116.5 mm c/c
• 16 mm little end bush
• 4340 Forged Chrome moly steel
• Shot peened
• H Beam Design
• Supplied With 20,000 H/Tensile Bolts
• 16 mm Bronze Bush little end
• oil squirters

Pistons

Hypertectic pistons, 70mm, 16mm pins, suited for street conditions.

Sleeves

Premium grade cast iron for the job

Head Gasket

Copper .9mm thick

Instructions on Machining

Machining available, we can resleeve your barrel, bore the top case to suit O/S sleeves, valve service head or big valve and porting work, lighten crank deball and clean and balance or we can do the whole engine.

Honda CB750 1050cc Big Bore Kit

(Rods, Head Gasket, Sleeves, B/E & Piston Kit)

1050cc big bore kit to fit to CB750 SOHC 1969 – 1978, 72mm pistons, H beam rods, sleeves, conrod bearings and head gasket.

Conrods

• 118.5 mm c/c
• 16 mm little end bush
• 4340 Forged Chrome moly steel
• Shot peened
• H Beam Design
• Supplied With 20,000 H/Tensile Bolts
• 16 mm Bronze Bush little end
• oil squirters

Pistons

Hypertectic pistons, 72mm, 16mm pins, suited for street conditions.

Sleeves

Premium grade cast iron for the job

Head Gasket

Copper .9mm thick

Instructions on Machining

Machining available, we can resleeve your barrel, bore the top case to suit O/S sleeves, valve service head or big valve and porting work, lighten crank deball and clean and balance or we can do the whole engine.

Honda CB750 SOHC 1100cc Big Bore Kit

1100cc Big Bore to fit CB750 SOHC 1969 – 1978 Kit, 74mm flat top pistons, H beam rods, sleeves, conrod bearings, and head gasket. Conrods.  Instructions on machining.

Use your standard crank, I have done a number of these kits in builds, and with head work, cam, big valves, big exhaust, good ignition, and flat slide, it is an awesome engine.

Machining is not complicated, bit of welding on the top case between sleeve holes to support the O ring sealing the liner.

Machining available, I can re-sleeve your barrel, bore the top case to suit O/S sleeves, valve service head or big valve and porting work, lighten crank deball, and clean and balance, or I can do the whole engine.

Honda CB750 SOHC 1240cc Big Bore Kit

1240cc Big Bore Stroker to fit to CB750 SOHC 1969 – 1978 Kit, 74mm pistons flat top pistons, H beam rods, sleeves, conrod bearings, 70mm nitrided stroker crank and head gasket. Instructions on machining.

The RPE 70 mm nitrided stroke crank with the RPE 1100 big bore kit combination, I have done a number of these kits in builds, and with head work, cam, big valves, big exhaust, good ignition and flat slide is an awesome engine.

Machining is not real complicated, bit of welding on the top case between sleeve holes to support the O ring sealing the liner. There is a small amount of relieving in the bottom case for rod bolts due to the extra stroke.

Machining available, I can re-sleeve your barrel, bore the top case to suit O/S sleeves, valve service head or big valve and porting work, or I can do the whole engine.