EVINRUDE 140 JETTING

[RKMAC]

I have a 93 140hp evinrude model 140cxtua. It cranks right up and idles good. When I start going and get to around 8 or 900 rpms through around 1500rpms it has a sneeze in it which I understand to represent a lean condition. Beyond 1500rpm it runs great. This motor has the 4 plastic carbs with no adjustments. The two air bleeder jets all have the same value for the top ones (I belive they are the low range jets) and the bottom ones are the same for two cylinders say a 36 and the other two are around 39. I recently bought this motor and the mechanic told me that he had messed with the jetting because one of the cylinders was flooding causing it to miss. I corrected that problem by cleaning all of the contacts under the flywheel. Turned out it was not firing all of the time causing it to flood and then miss. Anyway, should all of the mid range air bleeder jets be the same? If not does anyone have the jet sizes that this motor should have come with originally? <br /><br />Thanks

 

[93bronco]

Re: EVINRUDE 140 JETTING

i think you have your model number typed in wrong. please double check it. thanx <br />I N T R O D U C E S<br />1 2 3 4 5 6 7 8 9 0<br /><br />140 CX <counter rotation 25 in> <br />something isnt rite with the model number.

 

[clanton]

Re: EVINRUDE 140 JETTING

2K BOAT are you the one that had a 120/140 with timing problem? Did you solve this?

 

[bdowell]

Re: EVINRUDE 140 JETTING

I have an 85 140hp Evie also. I have<br />exact same problem. I have had it to<br />some supposedly good mechanics in this<br />area and they tell me that this is common<br />to the 140hp. They tell me that as you advance<br />throttle it is only actually advancing the spark<br />until you get up to that sweet spot of 1500<br />rpm you mention and then it smooths out as<br />it gets more gas. Mine has been completely<br />rebuilt and runs great except in that 800-1500<br />rpm range you mention. Is not a good troller.<br />But runs like a raped ape at anything over<br />the 1500 rpm mark.<br /><br />Bob

 

[Dhadley]

Re: EVINRUDE 140 JETTING

The top air bleed jets are for the intermediate circuit and the lower ones are the idle circuit. Keep in mind these meter AIR. To go richer you go smaller.<br /><br />Make sure your butterflies are all closed. A very common situation with those carbs and will act just about as you described.<br /><br />Good luck!