Re: Johnson 10 GT (2001) Won't run
(Compression & Spark Test)<br />(J. Reeves)<br /> <br />1st - Regardless of what problem one might encounter, always start with the basic troubleshooting procedure. Check the compression which should be in the range of 100+ psi and even on all cylinders.<br /> <br />2nd - With the spark plugs removed, rig up some type of spark tester whereas you can set a gap to be jumped. Set the gap to 7/16". The spark should jump the gap with a strong blue lightning like flame..... a real strong blue snap!<br /> <br />If there was no change in the spark, on engines from 1973 up, disconnect the RED main electrical plug at the engine. Remove the s/plugs. crank the engine via the starter solenoid (jumper bat term to small 3/8" term nut, not the ground nut) and observe spark. If spark is now okay as stated above, the usual cause is a shorted ignition switch.<br /> <br />If the above checks out as it should, and the engine dies out when throttle is applied, it is usually due to one or both of two things. The carburetors are fouled, in which case the cure would be to remove, clean, and rebuild them..... or the timer base under the flywheel is sticking which would result in a retarded spark.<br /> <br />To check the timer base for sticking (Engine Not Running), spin the prop to align the shifter dog with forward gear and while doing so, put the engine into forward gear. Now, while watching the timer base, slowly apply throttle clear up to full throttle. The timer base should move smoothly all the way up to the full advance spark setting. If the timer base sticks, find out why and correct that problem.
