1976 johnson recoil start 15 hp

Chrisham

Petty Officer 3rd Class
Joined
Mar 20, 2015
Messages
97
This is a motor that I got at a flea market that I have been tinkering with.I rebuilt carb and added a new impeller.i have had it 2 or 3 years .It has not been run .The compression cold is 90 on the bottom cylinder and 100 on the top .Is this ok.I assume it will go up warm and I'm not sure if my compression tester is calibrated.Also when you tighten the recoil start it will lock it down all parts appear to be in place What will cause this.I do have the manuel for this motor
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saltchuckmatt

Captain
Joined
Jul 19, 2019
Messages
3,227
Those will run with slightly lower compression. Those big recoil gears are tough to pull. Not sure whether yours is wrong without pictures but when I get an old 9.9 or 15 I pull the rope out as far as I can and spray a 1/2 can of wd40 in there. Then crank it a bunch of times. Always works way better.
 
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