140 johnson major bogging under load HELP!

140 omc 1985 idles great at about 500 rpms wot lots of power its when u r stopped and hit the throttle ther is no powere till u hit about 2500 rpms then it flys it is on a 16 foot charger with a 21 pitch propsometimes it stalls when u stop and u usually have to uswe the warm up switch to start it hot. the carbs are rebiult and cleanede , new rectifier, new plugs no gas restrictions,vro works fine the reed valves are perfect all new intake gaskets. when u start to excellerater slowly the enguine slightly misses and runs rough untll u gret about 2500 rpms then its hold on tight it has a hard time pulling up a 150 pound skiier ive tried everthing any ideas?

Re: 140 johnson major bogging under load HELP!

tylerr,<br />some of the experienced guys here have suggested taking off the cowling or hood with engine running at night and look for stray spark around the engine. even with new plugs this could happen if not all the energy is going to the tip of the plug. seems like it's not fuel related. good luck.

Re: 140 johnson major bogging under load HELP!

Check powerpack.

Re: 140 johnson major bogging under load HELP!

tylerr, I have the same engine and I have a question about the warm up switch. Please email. Dude31142@aol.com

Re: 140 johnson major bogging under load HELP!

I HAD THE SAME PROBLEM JUST ABOUT A YEAR AGO. I HAD THE MOTOR ON A SPRINT 16 FT BASS BOAT. EVERYTIME I TOOK OFF IF FELL FLAT ON ITS FACE. BUT IT ONLY DID IT AFTER IT WARMED UP SO I THOUGHT. WHAT WAS HAPPENING WAS THE 2 EXHAUST HOLES EVNTING ABOVE THE WATER LINE UPON ACELLORATING THE 2 VENTS WOULD SUMERGE BELOW THE WATER LINE AND IT WOULD FALL FLAT ON IT'S FACE. WHATG I DID WAS DRILL 2 NEW HOLES JUST BELOW THE MOTOR COWLING. ABOUT 2" ABOVE THE ORGINAL HOLES AND IT WORKED FINE. FOR SOME REASON THE LOOPERS ARE VERY SENSITIVE TO THIS. JUST LOOK TO SEE IF THEY GO UNDER WATER WHEN YOU GAS IT. IF THEY DO I WOULD BET MONEY THIS WOULD SOLVE YOUR PROB. THANKS AND GOOD LUCK !!!

Re: 140 johnson major bogging under load HELP!

rjarreau Look at how easy it is to read everybodys answers and then look at your answer. It hurts the eyes to read all Caps. Please use lower case.<br />steve

Re: 140 johnson major bogging under load HELP!

First off...the idle is too low..run you engine @800 in gear. Next..has the engine been rebuilt?<br /><br />If so..you may have to oversize the low speed fuel jets.<br /><br />An easy way to tell if its lean at idle even though it does not pop. In gear crack the throttle and then pull back to neutral. If the engine stumbles and dies..its lean.<br /><br />TMD