OMC carburator jetting location

[klbusbee]

Hi,I have a 93' evinrude 225 and am in the process of rebuilding the carbs,took the time to mark the carbs as to which cyl they came from but when putting back together with new kits found that one set of jets were a different size.(when I took them apart put all the jets together to soak).Talked to a local tech and he said it's common to have one jetted different but he didn't know which one it would be on my Rude.So if anybody knows which cyl has different jetting or if it should all be the same let me know.Thanks

 

[clanton]

Re: OMC carburator jetting location

I think I can help, but cannot look in manual until I return home Monday/Tuesday. Keep bumping back to top.

 

[klbusbee]

Re: OMC carburator jetting location

Thanks Clanton,sure hope you can.

 

[clanton]

Re: OMC carburator jetting location

Cylinder 5 and 6 should have the larger jets I think. the 2 sizes may be 62D and 65D. I need to verify this.

 

[93bronco]

Re: OMC carburator jetting location

which jets are you talking about, the smaller air jets or the bigger high speed fuel bowl jet? didnt see a complete model number as it looks like there is difference in the suffix letter of the motor, in relation to carb set up.

 

[seahorse5]

Re: OMC carburator jetting location

There was a service recommendation about putting .065 jets in #5 and #6, but that was for the 3.0 liter blocks of '88 thru '92. They revamped the blocks for '93 and later by lowering compression slightly in #5 and #6.<br /><br />What is the model number of your motor? Has anyone changed complete carbs on it?

 

[clanton]

Re: OMC carburator jetting location

2KBoat the main jets. The information I posted came from an old service bulletin, thats why I said I need to verify the information. There is no service bulletin for the 93 engine. The best place to look is parts book or service manual. I look service manual nothing. Will try to find parts book sometime today. I have pack some of my books , have to dig them out again.

 

[boatman1959]

Re: OMC carburator jetting location

SORRY I cant help you but i saw that you are rebuilding your 225 carbs and besides your jet size mix up I was wondering if you could tell me how much was involved once you got inside them. I just posted a ? on rebuilding carbs on a 1990 255 Rude and was looking for feedback. I know now to keep all the jets with the carb, thanks to your question. If I feel that I can do the job i wiii be taking them off next week and I will let you know what ones are bigger in my 1990. Thanks for any help you might have. BOATMAN1959

 

[clanton]

Re: OMC carburator jetting location

Jet size 1993 225 A,B,C,D suffex model.<br /> Orifice idle air bleed #35<br /> Orifice #66<br /> High speed Orifice #63D<br /><br />Jet size 1993 225 F suffex model.<br />orifice idle air bleed #30<br />Orifice #66<br />High speed orifice #64D

 

[klbusbee]

Re: OMC carburator jetting location

For my question as to which cyl the one carb with the smaller orfice jets goes on? The model of my 93' Rude is E225TXETF and 5 of the carbs had 30/66/64D and the other carb orfice jets were different,the high speed orfice was a 63D (I'm at work now so not sure of size just know they were smaller)another thing 4 carbs were numbered 436604,one #436669 and the other one #435947.Very simple to rebuild and used Purple Power degreaser/cleaner to clean the carbs and the orfice jets with (works great).Lesson learned build one at a time! Now just need to know which cyl had different jets?Thanks for the help.

 

[clanton]

Re: OMC carburator jetting location

I would buy new jets for the one carbuator, then all six would have the same size jet listed in the parts book.

 

[93bronco]

Re: OMC carburator jetting location

im learning alot from the people on this site, but it is hard to grasp somethings.<br />anyway my my 92 120 which turned out to be a 88 140 had same jetting on port side but starboard was different on both carbs. i figured individual tunning for them selves and put it back to 120 specs instead of 140 < i thought it was a 120 at that time. ><br />-<br />i made a diagram of the carbs before i took them off with jet #s and rebuilt one at a time.<br />-<br />those carb #s seem kinda spread apart. cant find my 92 or 93 but have my 94 parts manual. wish i could help but clanton is the man of the hour.

 

[klbusbee]

Re: OMC carburator jetting location

So the book says all carbs should be the same?

 

[clanton]

Re: OMC carburator jetting location

Not the carbs, only the jets.. The only reason it would have a different jet is , mistake at factory, someone switching carbs, switching float bowls, wrong carbuator. You could check the carbuators part numbers. It might have a carb set up for a A B C D suffex model engine carbuator. I repacked my parts manual, to much work to unpack, may be a month before I have excess to the parts books. again.

 

[clanton]

Re: OMC carburator jetting location

One other problem. The last shop I worked at had a problem with a 70HP and a 150HP. The rep from OMC changed the jets in the carbs, did not help much. Now the engines have jets in the carb not recommended by service manual, a parts book, or a service bulletin. The next mechanic that works on the carbs will have no idel, how the odd size jet got there, and will have the same problem you are having, trying to decide the correct jet for the engine.

 

[Dhadley]

Re: OMC carburator jetting location

Clanton, I dont remember what service bulletin (or advisory) it was but there was one that came out talking about break-in. They wanted the hi speed jets taken from 62 to 65's in the bottom 2 (5&6) cylinders. Then they talked abour replacing them after the break-in period. I thought that was a little odd but OK. Now - since my memory isnt what it was, the bulletin may have stated to increase the hi speed jet by 3 sizes and the majority of what we saw was 62D's.<br /><br />What we did (and it seemed to work) was to run 65's in the bottom 2, 64's in the middle 2 and 63's in the top 2. That was based on the fact the bottm two ran hotter combustion temps and they got cooler as they went up. Keep in mind the fuel make up at the time and exhaust routing.<br /><br />Good point about confusing the next guy. We used to hang a little tag on the powerhead for the owner to keep with the owners manual. And no, I dont think they ever did. Lol!<br /><br />Just a thought.

 

[93bronco]

Re: OMC carburator jetting location

according to my 1994 parts listing:<br />intermediate- #66 (top)<br />idle air------ #30 (bottom)<br />high speed-- #64D (fuel bowl)<br />this is the 225 "k" suffix for that year.<br />but they are the same as you listed. and all 6 carbs have the same as listed above.

 

[clanton]

Re: OMC carburator jetting location

The service bulletin is 2241 dated June 1991.<br />Changed cylinder number 5 and 6 to main jet number 65D on all EI (1991) 20 inch shaft(bass boat)outboards in inventory. Im sure that a lot of these wernt changed. This was only for breakin. I here some rebuilders bump the jet size up a few sizes and retard the timing, but I have not seen anything in writing on this.

 

[clanton]

Re: OMC carburator jetting location

I found one more. service bulletin 2321 dated November 1997. 1994 (ERS) change high speed jet when replacing powerhead. Refers to 200HP, 200 Limited Edition and 225HP. Gives jet size for carbuator part number, which is on a piece of paper glued to side of carbuator, and is gone the first time you clean the carbuators.<br /><br />I would put the same jet in all carbuators, in the 1993

 

[klbusbee]

Re: OMC carburator jetting location

Thanks for the help,I spoke with a OMC tech today and he told me I should put the carbs on marking the one with different jets,then put a new set of plugs in the motor and take it out,Than idle around for 20 to 30 min to heat the plugs and give them some color,Than run 4000 to 4500 rpm's for about 1/4 to 1/2 mile and shut it down,pull the plugs and check the color and if one is dark and one is light(the other 4 should be about the same)I should switch the jets in the two and do the same thing again,and if only one is light(lean)I should change the jets to match the rest.He also said to run a compression check beforehand to see if a cyl is down.What do ya'll think of that?