Re: '67 Johnson 60hp -won't idle
Fajsam.... Check for water in the fuel by simply removing one of the 7/16" hex head bolts at the lower front section of the carburetor.<br /><br />Then check the compression and spark. Compression should be approx 100+ psi and even on all cylinders. Spark, with the plugs out, should jump a 1/4" gap on all cyls with a strong blue flame.<br /><br />If the above areas check out okay, hopefully your problem can be contributed to the carburetor adjustments which can be corrected as follows:<br /><br />That engine has fixed brass high speed jets which are located in back of those 7/16" hex head bolts. If clogged, that will of course affect the engines operation. Both of the H/S jets must be perfectly clean.<br /><br />(Carburetor Adjustments - Older V/4 Downdraft Carb)<br /> <br />Have the slow speed needle valve knobs installed upside down so that they can be turned without encountering any obstruction.<br /><br />Gently seat each of the Slow Speed needle valves, then back each one out one and one half (1-1/2) turns. NOTE... have the jam nut on the s/speed needles snug so that viberation won't have any effect on them, but loose enough so that you can turn them without a great amout of effort.<br /><br />(Slow Speed Adjustments)<br />Now, lowering the rpms of course, take the engine out of gear and set the throttle just to where the engine will stay running. Again, in segments of 1/8 turn, slowly start turning in one of the slow speed needle valves, waiting a few seconds between each turning for the engine to respond. <br /><br />As you turn the s/speed needles in, the rpms will increase..... and as it does, lower the rpms to where the engine will just stay running (otherwise the rpms will climb quite high).<br /><br />You will reach a point whereas the engine will either start to die out or it will spit back (sounds like a mjild backfire). At that point, back the needle valve out 1/4 turn. Repeat the process with the remaining slow speed needle. Again, at some point in that 1/4 turn out, you will find the smoothest setting. When finished, tighten the jam nut somewhat, then remove and reinstall the s/speed knobs correctly (right side up).
