
Reliability is built, not claimed. Our production and QC teams work together to deliver spark plugs that perform consistently in the harshest conditions.
TAKUMI R5B12-77 spark plug is a form, fit and function equivalent replacement for OEM part 243-4291. TAKUMI R5B12-77 iridium industrial spark plug, cross-referenced to Champion RB77WPCC / Denso GI3-1 / Altronic L1863B family.
Every TAKUMI unit is produced in an ISO 9001 and IATF 16949 certified factory, 100% tested before shipment. The plug is engineered for long service life in continuous operation, with a nickel-plated shell, copper-core electrode and high-grade ceramic insulator.
OE numbers are for reference only. Final fitment should be confirmed before ordering.

Our QC team records batch numbers for full traceability. Should any issue arise, we can quickly isolate the production batch and respond within 48 hours.
TAKUMI runs a fully integrated manufacturing base: CNC machining, automated assembly and 100% functional testing under one roof.



From raw material to finished spark plug, every process is controlled in-house with ISO-certified procedures.