GENERAL SERVICE INFORMATION
2-31
1-/ 2-Cylinder
Twin Cylinder Engines
A. 8/9.8 Engines
Because of a unique multi-cylinder ignition system, timing of the
ignition is only necessary when the powerhead is disassembled
and reassembled. This procedure is fairly simple as the only
purpose is to ensure that the coil plate rotates in the proper
direction.
B. 9.9/15/18 Engines
9.9/15/18 engines have timing marks on the side of the coil plate
which must be aligned to the seam of the mating surfaces of the
crankcase.
C. 25/30 Engines
Similar to 9.9/15/18 Engines.
D. 40 Engines
Similar to 9.9/15/18 Engines.
Ignition Timing Adjustment
2.5 and 3.5 Models
Throttle Setting Full Open Full Closed (In Gear)
Engine Match Mark Target RPM Match Mark Target RPM
2.5A BTDC 20° 3800 - 5200 BTDC 20° —
3.5A BTDC 20° 4200 - 5300 BTDC 20° —
3.5B BTDC 20° 4200 - 5300 BTDC 20° 1100
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