BSA A65 Big Bore Kit SRM

SRM Big Bore Kit 750cc - BSA A65


Availability: In stock

Excl. Tax: £963.90 Incl. Tax: £1,156.68
BSA A65 Big Bore Kit

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Excl. Tax: £963.90 Incl. Tax: £1,156.68
*VAT Removed at checkout for Non EEC Members


750cc SRM Big Bore Kit for BSA A65

Get some extra power for your BSA A65 with the SRM Alloy Big Bore Kit.

Suitable for BSA A65 1970-72, 1962-69 will need to select the 5/16" - 3/8" base stud conversion kit in the options above

Kit consists of;

  • Alloy Big Bore Cylinder Barrel (weighs just 4.1kgs)
  • Pistons
  • Chrome moly steel high strength pushrods
  • High tensile head bolts
  • Solid copper head gasket


Available in 8.75:1 or 10:1

BSA A65 Big Bore Kit Manufacturer Description

Big bore kit includes Alloy cylinder 4.1kgs with spun cast iron liners , pistons complete, set of chrome moly steel high strength pushrods, set of special high tensile head bolts, solid copper head gasket, Compression is approximately 8.75:1 with thick gasket.  Also available is a base stud kit for converting the early cases to take the 3/8 studs, our part number SRMSP3H , stud kit is stainless steel studs and stainless steel nuts and washers. Big bore kit is 79mm standard and can be rebored to 79.5mm.
Suitable for use with standard crank and conrods and standard head, it is advised that cylinder head is gas flowed with big valves.

Note that crankcase mouth will have to be be machined out slightly to take the larger bore spigots and also clear the cam follower guide spigots.

Additional Information