Triumilynn Ignition Coil for Onan Engines — Direct-Fit Replacement (Fits 166-0820 / Solid-State & Points, Correct Resistance)

Triumilynn ignition coil replacement engineered to restore dependable spark to specific Onan small engines by matching original resistance and terminal configurations.

This ignition coil assembly (models 166-0820, 166-0761, 166-0772 and related numbers) is a direct-fit aftermarket unit designed for a defined set of Onan engines. It helps troubleshoot common ignition failures—no spark, hard starts, misfires, rough idling, or unexpected shutdowns—by providing the correct primary and secondary resistance and compatible terminal layout. The kit includes the coil plus basic garage-ready accessories to simplify swap-out and verification.

Which Onan models and part numbers does this coil replace?

This coil is intended only for the Onan engine families and part numbers listed. Confirm compatibility by checking your engine tag and the old coil number before ordering to avoid mismatch and premature wear.

• Fits part numbers: 166-0820, 166-0772, 166-0804, 166-0648, 166-0761, 541-0522.
• Compatible engine series: BF, BFA, BG, BGA, BGE, B43E, B43G, B43M, B48G, CCK/CCKA/CCKB, NHA/NHB/NHC/NHE/NHP, N52M, P218G, P220G, P224G.
• Use the engine tag and your old coil number as the definitive fit check.

How do I know I need this ignition coil?

Signs of a failing coil include no spark at the plug, engines that crank without firing, intermittent misfires, and engines that stall unexpectedly. Before replacing the coil, verify wiring, the spark plug, and battery/charging conditions; then confirm coil resistance with a multimeter.

• Symptoms: no spark, hard starts, rough running, unexpected shutdowns.
• Measure: primary and secondary resistance before and after installation to confirm proper values.
• Starter checks: inspect plug, wiring, and ground continuity to avoid misdiagnosis.

What resistance values and terminals should I check for correct fit?

The coil comes in two resistance families that correspond to solid-state and points ignition systems—verify values to select the right replacement. Matching both primary and secondary ohms plus terminal style prevents poor performance and shortened service life.

• Solid-state applications (166-0820/541-0522): primary ≈ 3.12 Ω, secondary ≈ 20.5 kΩ.
• Points applications (166-0804/166-0772): primary ≈ 4.25 Ω, secondary ≈ 37.85 kΩ.
• Compare terminal layout and spark-plug lead socket to the original coil for a secure fit.

What comes in the kit and how should I install it safely?

The kit is packaged for straightforward garage service and includes tools to help secure wiring during reassembly. Always disconnect battery power and document each wire location; use standard hand tools and verify resistances with a meter before returning the engine to regular use.

• Included: 1 Triumilynn ignition coil, 1 pair of gloves, 6 cable ties for tidy routing.
• Safety steps: disconnect power, label wires, remove old coil, and transfer/connect wires in the same order.
• Verification: test primary and secondary resistance after fitting and check for stable spark under cranking.

Who is this for: This product is aimed at mechanics, fleet maintainers, and DIY owners of older Onan-equipped equipment who need a precise replacement coil. If you maintain generators, small industrial engines, or lawn and turf machines from the listed Onan families and want a component that matches original resistance specs and connectors, this coil kit provides a practical, ready-to-install option.