1984 Johnson 15 HP, Starts then Dies

[111torrance111]

I have a 1984 Johnson 15 HP, up until last week it ran great. I went to start it and it wouln't start. <br />After asking for help from you folks I found the Cam Roller bracket was broken, I replaced the bracket and also tried to rebuild the carb.<br /><br />Now it's hard to start and when it does it runs great for 1 minute then dies, I pull the plug and they seem wet. When I exchange them with a dry set, it hard to start again only to die after another minute.<br /><br /><br />History:<br />I had the motor for about 6 month, changed the impeller, gear oil and plugs. Haven't had any troble until last week, I have about 25 to 30 hours use in that six months.

 

[JB]

Re: 1984 Johnson 15 HP, Starts then Dies

Sounds like it is burning up the fuel in the carb, then running out.<br /><br />Failing fuel pump, air leak or restriction in fuel supply lines or tank pickup.<br /><br />Try pumping the primer bulb to see if that keeps her running. If so fuel supply is your problem.

 

[zaner]

Re: 1984 Johnson 15 HP, Starts then Dies

You may also want to check to make sure your float to see that it sits level when you hold the carb upside-down it could be floading out if your plugs are wet.

 

[111torrance111]

Re: 1984 Johnson 15 HP, Starts then Dies

Pumping the ball does keep it running, Should the ball stay hard after the motor has started?<br /><br />I'll take the card apart again and check the float, I just put a new float in and adjusted it the best I could per the manual, but didn't have the acual float tool.<br /><br />Jerry

 

[joaklay]

Re: 1984 Johnson 15 HP, Starts then Dies

If pumping the ball keeps it running, I'd think that the gas tanks pick-up tube (or filter) is clogged.<br /> If not that, you can easily check the fuel pumps operation by removing the hose at the carb, pull the cord and see if gas comes out while it's turning over.