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idels fine does not run out 1958 35 hp Johnson

E

Eric R. Moore

New member
First thanks for you help, I have a 1958 35 hp Johnson sea horse it starts easy enough and seems to idle fine, however when i give it full throttle it does not speed up to the rpm's it should. I don't have a tach on it but I'm guessing it is only getting up somewhere around 1500 to 2000 rpm and I'm not sure where to start. I have cleaned the carb, and have made adjustments on it but it which have made made no difference in the way it runs. Any help would be very much appreciated.
 
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It may very well be running on on cylinder.--------It has a duel ignition system , one coil, points and condenser for each.-------------So check to see that you have spark on each cylinder.---Laying the plug on the block is not a good test.----Spark must jump a gap of 1/4 " or better to be " good "-----If that is good then do a compression test.
 
Well I checked the compression and I have a 120 psi in both cylinders the spark on both plugs are jumping a well over a 1/4 inch i have pulled the fly wheel off and what i can see of the coils look good one set of points seems to look a little worn, not that i could really tell just looking at it. what next?
 
Good spark and good compression , then it must be a fuel problem.-----------Have you looked at the reed valves / crankcase compression ??----- Revisit your carburetor work.-----------Is this motor running with a fuel pump or a pressure tank ??
 
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