johnson 35hp seahorse problem

[tombleds]

have a seahorse 35 model J35ELCIG ser# E5545954<br />misses and pops when running sometime appears as it is only running on 1 cylynder but using infrared temp gun it shows both cylnders to be approx. same temp. <br /><br />I have thouroughly cleaned carb- made new gasket for carb to intake. <br />plugs good <br />compression 125lbs both cyl.<br /><br />Not to sound stupid but it appears to have a cdi box so I assume no points(I have no idea how old this engine is since it came with an old pontoon boat I Bought.<br /><br />any help would be appreciated thanks

 

[Silvertip]

Re: johnson 35hp seahorse problem

If it sounds like its missing, it probably is. Check spark on both cylinders. Have you removed and checked the plugs? Do the wires look to be in good condition. Do the simple stuff first.

 

[tombleds]

Re: johnson 35hp seahorse problem

thanks for the fast reply<br />plugs good(new) plug wires appear to be good<br />missing may not be correct term it runs then kind of pops(maybe a little backfiring) then catches its breath(sometimes) and either dies or keeps running and then repeats <br /><br /><br />any idea as too what age and if it has electronic ignition<br /><br />thanks

 

[JB]

Re: johnson 35hp seahorse problem

That's a 1981 engine, Tom.

 

[tombleds]

Re: johnson 35hp seahorse problem

thanks jb

 

[fireman57]

Re: johnson 35hp seahorse problem

Sounds like stuff in the carbs. are you sure that it is not sneezing? Does it pop back out of the carb? Could be running lean. Rings don't like that.

 

[tombleds]

Re: johnson 35hp seahorse problem

fireman57 thanks for the reply <br /><br />I have cleaned the carb and all appears to be well very simple carb(as most are) all passages are open<br /><br />thanks

 

[Docdoc]

Re: johnson 35hp seahorse problem

Try adjusting your idle mixture to the rich side (turn mixture screw counter clockwise 1/8 to 1/4 turn). What fireman is describing is sometimes called a "lean pop" Making the mixture richer should alleviate that.

 

[tombleds]

Re: johnson 35hp seahorse problem

thanks I will try that