Honda motorcycle parts
Choose your model and year to see parts listed for your bike.
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1978 Honda CB750K · Engine Buying guide
The standard piston kit, late-application oil seal set and paper filter illustrate three different jobs. Each has its own contents and application checks, rather than forming a single complete overhaul package.
Standard-bore piston kitAftermarket 61 mm standard-bore kit replacing 13101-392-020: one piston, pin, clips and five-ring set for one cylinder.View part
Seven-piece engine oil seal setSeven shaft seals for the listed 1977–78 application, including countershaft reference 91205-405-005 at 29.8 × 62 × 7.View part
Original-type paper oil filterReplacement filter element. The accompanying O-rings, spring and washers are offered separately.View part
Related parts: Athena top-end gasket set · Filter housing O-ring set
Compare the sealing locations opened by the repair with the actual contents of each package. The top-end gasket set names head, base and cam-cover gaskets along with its smaller sealing pieces; the shaft-seal kit lists different engine locations.
Check the engine and installed components when the motorcycle history is uncertain. This inventory includes stock-application parts and custom covers or oil accessories. Standard-bore pistons and listed shaft seals need comparison with the actual engine, while altered filter hardware needs its own application check.
Both use replacement reference 13101-392-020 and a listed 61 mm standard-bore application. The piston-only product excludes rings, pin and clips, whereas the kit supplies them. Choose around the measured cylinder and parts required rather than using the shared reference as a package-contents check.
It lists one seal each for the countershaft, clutch arm, shift shaft, crank, starting-clutch gear, kickstart and tach drive. Compare those named locations with the repair scope; the seven-piece title does not establish that every possible engine seal is supplied.
The paper filter description says O-rings, springs and washers are separate. Compare those pieces and the fitted housing with the available service listings. If the original housing has been changed, verify the filter arrangement before buying an original-type element.
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