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Two of the coil mounting bolts go thru the mag plate and engage the retaining ring. If you wrung them down really tight, they could cause the retaining ring to bind a bit. Doubtful, but possible. As Dave noted, first pull the flywheel and try to advance the throttle – if it moves freely, the retaining screws are not the problem.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp
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