Join Date: Jun 2007
Location: Bancroft Ontario Canada eh.
Year: 1991 1500 SE & 79 1000 GL.
Model: '79 GL1000 & '91 GL1500
To test compression, you need a fully charged battery & a healthy starter. All 4 plugs out & kill switch to engine off. Choke off & throttle must be wide open. Spin the engine over with tester screwed into one of the 4 cylinders. spin it until the needle does not climb any more. Do this with all 4 cylinders & record your numbers. You should be within 10 pounds of each other. When you squirt oil into the cylinders you are testing for bad rings. if your compression rises dramatically your rings are worn. if it really does not go up that much & your compression is abnormally low, you have leaking valves.
If the engine has been sitting, compression might be a little low on test. once you get it running & put a few tanks of fuel through it, it might go up by 10 or 20 pounds. Wing engines are long life machines. Keep your oil clean & you will turn the clock 4 or 5 times!
If ya cant fix it with a hammer, it's prolly lectrical
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