Johnson 50hp '82, running rough - Revision history

Tim at 14:34, 11 August 2013

2013-08-11T14:34:37Z

← Older revision		Revision as of 10:34, 11 August 2013
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	:holding plug wires close to block, spark had no trouble jumping 1/2"		:holding plug wires close to block, spark had no trouble jumping 1/2"
	;solution: Lower float was banging into the roof of the bowl before that little pin had shut off fuel flow into the carb. Excess fuel dripping out the front of the carb and was making it run rough. Hitting those bumps must have bent the float.		;solution: Lower float was banging into the roof of the bowl before that little pin had shut off fuel flow into the carb. Excess fuel dripping out the front of the carb and was making it run rough. Hitting those bumps must have bent the float.
	;the wild goose chase (or troubleshooting by credit card): There was a crack in one of the coils, I replaced it. The voltmeter wasn't reading the right peak voltage output from the power pack (though you can't measure that with a voltmeter). Replaced it. thought maybe the fuel hose was collapsing inside. Replaced it. Swapped out the fuel pump with one I had, after pulling it from the head and finding no evidence of fuel leaking from vacuum hole. Replaced fuel lines in motor (They looked pretty crappy anyway).		;the wild goose chase (or troubleshooting by credit card): There was a crack in one of the coils, I replaced it. The voltmeter wasn't reading the right peak voltage output from the power pack (though you can't measure that with a voltmeter). Replaced it. thought maybe the fuel hose was collapsing inside. Replaced it. Swapped out the fuel pump with one I had, after pulling it from the head and finding no evidence of fuel leaking from vacuum hole. Replaced fuel lines in motor (They looked pretty crappy anyway). Anybody need parts?

Tim at 14:32, 11 August 2013

2013-08-11T14:32:52Z

← Older revision		Revision as of 10:32, 11 August 2013
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	====Johnson 50hp '82, running rough====		====Johnson 50hp '82, running rough====
			:J50BELCN, 7/2013
	;manifestation: after running fine on 2 outings, the day started out running fine. 15 minutes later, after I hit the throttle entering Pleasant bay from little Pleasant bay I hit a couple of bumpy waves. The engine started running at less than 1/2 speed, running rough. Same at idle: very rough, stalling, the idle lever made little difference in engine speed.		;manifestation: after running fine on 2 outings, the day started out running fine. 15 minutes later, after I hit the throttle entering Pleasant bay from little Pleasant bay I hit a couple of bumpy waves. The engine started running at less than 1/2 speed, running rough. Same at idle: very rough, stalling, the idle lever made little difference in engine speed.
	;evidence that I should have given credence to: lower carburetor had a little gas dripping out the air intake.		;evidence that I should have given credence to: lower carburetor had a little gas dripping out the air intake.
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	:plugs looked OK. similar to each other		:plugs looked OK. similar to each other
	:compression was good, same on both cylinders		:compression was good, same on both cylinders
			:stator coil and charge coil resistance within specs.
			:spraying starter fluid in upper carb caused engine to speed up, spraying into bottom carb had no effect.
			:holding plug wires close to block, spark had no trouble jumping 1/2"
			;solution: Lower float was banging into the roof of the bowl before that little pin had shut off fuel flow into the carb. Excess fuel dripping out the front of the carb and was making it run rough. Hitting those bumps must have bent the float.
			;the wild goose chase (or troubleshooting by credit card): There was a crack in one of the coils, I replaced it. The voltmeter wasn't reading the right peak voltage output from the power pack (though you can't measure that with a voltmeter). Replaced it. thought maybe the fuel hose was collapsing inside. Replaced it. Swapped out the fuel pump with one I had, after pulling it from the head and finding no evidence of fuel leaking from vacuum hole. Replaced fuel lines in motor (They looked pretty crappy anyway).

Tim: Created page with "====Johnson 50hp '82, running rough==== ;manifestation: after running fine on 2 outings, the day started out running fine. 15 minutes later, after I hit the throttle entering ..."

2013-08-11T14:10:51Z

Created page with "====Johnson 50hp '82, running rough==== ;manifestation: after running fine on 2 outings, the day started out running fine. 15 minutes later, after I hit the throttle entering ..."

New page

====Johnson 50hp '82, running rough====
;manifestation: after running fine on 2 outings, the day started out running fine. 15 minutes later, after I hit the throttle entering Pleasant bay from little Pleasant bay I hit a couple of bumpy waves. The engine started running at less than 1/2 speed, running rough. Same at idle: very rough, stalling, the idle lever made little difference in engine speed.
;evidence that I should have given credence to: lower carburetor had a little gas dripping out the air intake.
;tests: fuel bulb seemed to pump up fine. But it slowly got un-firm. Pumping it while underway made no difference
:removing either plug wire caused stall
:plugs looked OK. similar to each other
:compression was good, same on both cylinders