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I have a 1972 25hp Johnson runs great starts easy. But when it is in the forward gear it jerks about every 3 1/2 seconds. Does this when going fast or slow. It jerks harder when going fast. Bends the shear pin till it finaly breaks. Kind of hard on the transom too. Any ideas?
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May be jumping out of gear. Disassemble gearcase and inspect forward gear, shift dog and shifter for wear. -
those are known for bad clutch dogs
they only have 2 ears, not like 6, the newer styleComment
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i have 25rl75b motor that does a similar thing
It seems to do a similar thing but about every 2 seconds. Hasnt bent a shear pin yet. I have only just obtained the motor. Gave it to the mechanic to check out .
it had been sitting still for some time. He over hauled the carby and he ran it for an hour and ran well. on the first outing it shuddered in gear , then ran for a bit ok , then started again .
Would this likely to be the same problem?Comment
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