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<blockquote data-quote="Hanr3" data-source="post: 159501" data-attributes="member: 1055"><p>History, brief.</p><p>'57 Johson 18hp, top speed on a 14' v bottom is 7.3-7.5mpg via gps. </p><p></p><p>Compression is 95 top piston, 110 bottom piston. </p><p>Sprak is great, I syncronized the timing to the carb per the repair manual.</p><p></p><p>I rebuilt the carb, no difference.</p><p>Bought a used carb, rebuilt it, now she starts and idles great. I can get it started now on the first couple of pulls. However top speed is still 7.3-7.5mph.</p><p></p><p>I beleive the prop to be the original. From what I understand it has a rubber bushing. I have broken a couple shear pins, could I have broken that rubber bushing? Could my problem be the prop? How do I tell. Woudl it still work even if broken?</p><p></p><p>What else could it be?</p></blockquote><p></p>
[QUOTE="Hanr3, post: 159501, member: 1055"] History, brief. '57 Johson 18hp, top speed on a 14' v bottom is 7.3-7.5mpg via gps. Compression is 95 top piston, 110 bottom piston. Sprak is great, I syncronized the timing to the carb per the repair manual. I rebuilt the carb, no difference. Bought a used carb, rebuilt it, now she starts and idles great. I can get it started now on the first couple of pulls. However top speed is still 7.3-7.5mph. I beleive the prop to be the original. From what I understand it has a rubber bushing. I have broken a couple shear pins, could I have broken that rubber bushing? Could my problem be the prop? How do I tell. Woudl it still work even if broken? What else could it be? [/QUOTE]
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