1996 johnson 48, RPMS low

[GS Cook]

I have a 96 Johnson 48. Starts and runs fine up to 3400 rpms then chocks down to no speed. I can kill and restart and it runs fine up to 3400 RPMS does same thing over. I just had New Prop, new plugs and carb. kits done. Did'nt solve problem. Sr. # G04100268 Mod. J4BESCL<br />This motor is on a 18 ft. pontoon. Any Clue?

 

[dkondelik]

Re: 1996 johnson 48, RPMS low

'afternoon GS,<br /><br />first, run her up & squeeze the fuel bulb. Does that get you there?<br /><br />if not, can you check to see if you have fire on all plugs when this is happening? i'm guessing that some safty (temp or oil) circuit is shutting you down.<br /><br />let us know what you find<br /><br />Good Luck

 

[chumbucket]

Re: 1996 johnson 48, RPMS low

Sue, I have 87 48 evinrude that acted same way. My problem was jet on bottom carb plugged. Joe Reeves helprd me on that fix.

 

[jim dozier]

Re: 1996 johnson 48, RPMS low

Who did the carb kits and what did they do with them? If pumping the bulb like klondike recommended doesn't help squirt some premix into the carb throats when it acts up and see if it helps, if so the carbs probably need to be redone.

 

[clanton]

Re: 1996 johnson 48, RPMS low

If your model number is correct, the numbers seem to indicate a 1990 model year. Look for a single tan wire connected to the powerpack, disconnect this wire and try it.

 

[GS Cook]

Re: 1996 johnson 48, RPMS low

Hey Clanton, We found thatlittle tan wire and my Husband disconceted that dude and guess what? We ran like a charm for a long time. Then we cut out again. But we figure maybe we can just take it a little easyer and maybe use it like it is. Maybe this wire has something to do with a heat censor. Anyway, wanted to let you know what was up. Thanks for the help.<br /><br />sue