Seahorse 18

J

justme5248

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Got an older Johson motor, it is white with a square cowl, around 1960 is my guess. Twin , electric start, put it on a 16 Grumman, it runs but is slower than my 1980 9.9 Johnson. One plug seems cold, other is hot, did test for spark, weak to none on lower plug. What do I need to expect or look for when pulling flywheel, pulled parts diagram off net, but shows one coil and not two as I expected. I do a lot of work on small engines but mainly chaisaws and such, otboards are new to me, so any help is appreciated.
 
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F_R

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Re: Seahorse 18

justme5248 said:
Got an older Johson motor, it is white with a square cowl, around 1960 is my guess. Twin , electric start, put it on a 16 Grumman, it runs but is slower than my 1980 9.9 Johnson. One plug seems cold, other is hot, did test for spark, weak to none on lower plug. What do I need to expect or look for when pulling flywheel, pulled parts diagram off net, but shows one coil and not two as I expected. I do a lot of work on small engines but mainly chaisaws and such, otboards are new to me, so any help is appreciated.
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If it is an 18hp from around the 1960's it has two coils. The parts book pictures only one for clarity's sake. I might add that both coils are probably shot (cracked). They usually are on motors of that vintage.
 

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J

justme5248

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Re: Seahorse 18

Thanks for the help, those pictures gave me a good idea of what to expect when I yank the flywheel. Most of these forums are pretty helpful, I fool around with snowmobliles and antique tractors, most are so old, owners manuals are but a dream. am on several forums, notably Yesterdays tractors and Arctic Chat. Dragged this outboard out of a boathouse, along with a 3.5 Firestone ( Scott-Attwater ?) , I will be the first to admit that it is a work in progress. Thanks again for help and pics.
PS: we have spark on the Firestone, still working on the carb.
 
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