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iboats Mercury | Mercury 200 series 20hp keikhaifer weak spark?
Weak spark on both leads or just one? That tells you a lot. Here's what I'd check, in this order:
1. Pull both plugs. The spec is NGK DCPR6E gapped at 0.9 mm (0.035 in). Fouled, worn or rounded plugs, or a wrong gap, can pass for...
remove the rubber exhaust seal, then lever under the base, it will start to come. the base (if its been in for a while) may damage when removing. but most modern water pump kits come with a new one.
best
simon higham
Outboard Buddy
