Honda motorcycle parts
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1981 Honda CB650 · Exhaust Gaskets & Studs Buying guide
The port-gasket options share replacement references but differ in package quantity. The stud-and-nut set is a separate purchase; compare its stated inventory and the fitted flange before treating it as the hardware for a changed exhaust.
Individual exhaust-port gasketOne gasket per purchase, with listed CB650 application.View part
Exhaust studs and flange nutsEight studs and eight flange nuts for the listed CB650 application.View part
Related parts: Ten-pack of exhaust-port gaskets
Gasket 17-2813 supplies one piece and pack 17-3813 supplies ten. Both list 18212-634-000, 18291-236-000 and 18291-MN4-920 for exhaust-port sealing. Keep those references with the order rather than choosing a gasket only because its title mentions the exhaust.
Set 73-1139 supplies eight exhaust studs and eight flange nuts. Compare that written inventory with the parts required and confirm additional components separately; it is not a complete exhaust-repair parts list.
The stud listing calls for checking spacing and flange thickness on a non-stock exhaust. It gives no stud thread dimensions or length, so obtain those specifications and compare the fitted flange before ordering where the original arrangement has changed.
These listings identify exhaust-port gaskets and give replacement references, but no dimensions for comparing an unidentified joint. Obtain the fitted exhaust system’s required gasket specification before selecting a seal for a different location or a changed connection.
Honda’s Common Service Manual calls for a new exhaust-pipe gasket whenever the pipe is removed from the engine. Include a replacement for each opened port connection and use the model-specific manual for assembly and tightening.
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