120 to 140 loop vee carbs

[93bronco]

have these carbs on my supposed to be 92 120lv # 398368. only thing the new OMCBOMB would tell me was that they are not from the above and were replaced by #432903. what does that belong to? need to know specific jetting of carb if they are in fact at least a v4 carb and not v6 to 8's. have them set for a 1990 120 rite now. idle air #41, intermediate #50 and high speed #63D.<br />also hhave a set of what i believe are 1985 140 carbs that have these numbers on side plate. 1st plate #393571, 140 T2, 22 KJMX . 2nd plate #393571, 30 DKMX. would like to know the actual jetting on these so if i have to replce with the other. the throttle plates that came with them is #ij-328642, #ij-330477. the intake that came with is #328627. would like to know all the specifics if some one can help about these parts. local shops will only sell me parts for them wont tell me what they are and what they go to. thanx

 

[93bronco]

Re: 120 to 140 loop vee carbs

took apart one of the 140 carbs and noticed that the fuel bowl is different on the inside where needle and seat are. these are flat and use nylon washer, the ones that were put back on boat had a built rise acting as a washer. didnt get the nylon ones back from new kit. are they supposed to be installed or left out. if they were put in and the float was adjusted rite could this still affect flooding. dont know if bottom of seat is supposed to bottom out. thanx

 

[clanton]

Re: 120 to 140 loop vee carbs

The 398368 changes to 432903 which is a carb for 1990 120/140. 393571 is carb for 1985 140. These numbers may have changed, I dont have the latest changes or excess to the changes.

 

[clanton]

Re: 120 to 140 loop vee carbs

The float seat has nylon washer on 1985. The 432903 carb does not show nylon washer.

 

[NOSLEEP]

Re: 120 to 140 loop vee carbs

2K BOAT MY MAN TELLS ME THAT THE OLD 85 120 LOOPER WAS REPLACED BY A LARGER BORE BLOCK IN AROUND 87/OR 88 120/140 THE ENGINEERS AT OMC AT THE TIME THOUGHT THE CARBS WOULD HAVE TO BE REPLACED OR REJETTED TO ACOMIDATE THE LARGER BORE<br />AND DID SUPPLY NEW CARBS. TURNED OUT THOUGH THAT OLD CARBS WORKED FINE ON NEW BORE SIZE. AND THESE CARBS ARE INTERCHANGABLE AS LONG AS ALL CARBS ARE SAME NUMBERS.SAYS HE HAS NOT ENCOUNTERED ANY PROBLEMS AND HAS MADE MANY SWICHES. AS LONG AS CARBS ARE FUNCTIONING WELL AND NOT VARNISHED OR PLUGGED. HE SAYS YOU MAY HAVE SOME OTHER PROBLEM RELATED TO TIMING OR FUEL RESTRICTION. MAKE SURE THE MAGNETS UNDER THE FLYWHEEL HAVE NOT COME LOOSE OR TURNED. AND THAT WOT TIMING IS SET CORRECTLY.

 

[Dhadley]

Re: 120 to 140 loop vee carbs

ANY looper carb body that has the raised area under the seat does not require a washer. ANY looper carb with a flat surface requires a washer.<br /><br />Heres a tip -- use the crossflow needle and seat in looper carbs.

 

[93bronco]

Re: 120 to 140 loop vee carbs

clanton- thanx in my 1990 parts manual i show #432902, could it be the 432903 was an upgrade? well any way i got the jetting right. will take down fuel bowls to check if washer was installed by mistake. also have to move primer to correct position. do you have a manual to tell the jetting on the 140 carbs? also the power pack number that was taken off is #583489. any idea what year that is supposed to be for? #584041 shows for 90 to 94..<br /><br />dhadley-what is the advantage of crossflow seats?<br />nosleep good to know after i get the original jetting correct i can install if i have to. was worried about bore increase. thanx gus

 

[Dhadley]

Re: 120 to 140 loop vee carbs

The looper seat has a very tiny inlet hole compared to the c/f. It fills the bowl better at high rpm but more importantly it could plug up easier. Gum, varnish etc.<br /><br />Good luck!

 

[93bronco]

Re: 120 to 140 loop vee carbs

thanx, ive read alot of posts on loop vees here <189 came up>, your name seems to have the most experience with this type of motor. i have delt with 3 omc shops in this area and they act like it would be a crime to help identify this motor so i can buy the correct parts. i ive even spent hours on the phone with omcbomb to try and figure this out. the only way i can seem to get close is by identifing part #s in hope that they will all come together but would be happy with a 60 to 70% match. is there soomeone that can help on the net or am i stuck. this # came off mid bracket. # 185932 10LM1, like the power pack 538489. these #s should get me some idea. i know that there is a number hand stamped on the starter side of motor and assume this would be a assembled part number. the center plug# is a rph # which is no help. any help would be greatly appreciated from anyone with the access to figure part#s out.

 

[clanton]

Re: 120 to 140 loop vee carbs

Looks like the pack 583489 will work on 1986/94, 120/140. The number was changed to 584040, then to 584041. The dealers dont want to trace the numbers, because it takes a lot of time to look up the numbers. The last computer program I looked at from OMC would chain the numbers that changed, but did not indicate which engine the part fit. I get 10.00 each number I look up , you wanta mail me a check, He he.

 

[Hooty]

Re: 120 to 140 loop vee carbs

2K BOAT,<br />I get the same sh** from the parts people here. Ya give 'um a part nr. and they'll say "that's a head", "I know it's a head, but what's it off of"? "I don' know". "Can you look it up"? "Nope".<br />I think they forget what a "customer" is.<br /><br />c/6<br /><br />Hooty

 

[NOSLEEP]

Re: 120 to 140 loop vee carbs

hello 2k boat<br />sounds like you should have a good handle on you carb problems. every body has been stearing you in the right directions. maybe you will be up and running for the week end ??

 

[93bronco]

Re: 120 to 140 loop vee carbs

clanton; thanx with the cd was wondering if the 1st # might help to identify yr. had to move boat due to lil woman complaining about noise.< modern day vampire sleeps all day> so now hhave to dive 30miles to get to it. but am going to pull crab bowls this weekend and check needle&seats. will try that and then re-lync&sync to besure followed by comp test. i know its almost time to winterize but i cant do that until im satisfied ive done everything i can 1st.<br /><br />hooty its frustrating i can rebuild a ford in my sleep and have alwats helped others when it comes to part matching. around here its if you dont know someone tough and even if you pay us, pay us again so on.<br /><br />no sleep thanx for your checking post, we all need help. im not to bad off ive got an extra bare block along with a complete powerhead no electronics for back up with 118, 116, 112 & 116 compression so if i have to will put that on after new head gaskets and all new elecronics if i have to < atleast timer and regulator> but hopefully it wont come to that and its still fuel problem.<br /><br />this site is great wish i could take you out for beer and fishing.

 

[Hooty]

Re: 120 to 140 loop vee carbs

Hooty wishes you could take us out for beer and fishing too. Thanks<br /><br />c/6<br /><br />Hooty

 

[clanton]

Re: 120 to 140 loop vee carbs

You got a pn for the timer?

 

[93bronco]

Re: 120 to 140 loop vee carbs

how about 583508 2 BOTW1, the primer was put in upside down so was running on manual prime open along with key prime. will be interesting to see the fuel section done rite tommorrow. what is the best way to check comp ratio with out hurting any other electronics?

 

[93bronco]

Re: 120 to 140 loop vee carbs

repositioned primer got to three carbs they had the nylon washers in took out. evident fuel was starting to flow out into box, reset floats. lower carbs fuel line looked restricted. will try and finish tomorrow. just an update thanx

 

[93bronco]

Re: 120 to 140 loop vee carbs

forgot to ask about routing of #3 carb with older short fuel log. as i was just looking in manual thats a big loop for that one line and the parts book calls for a 13in hose. its 13+ maybe by a 1/4. it was definitly being squeezed between butt of fuel log and air box.is there a better way to route that one. the newer style looks easier, but i have 2 of the older style. i think if i ever take it to a shop again im going to break out the camera and take pix so i can compare after i get it back if its not right.

 

[93bronco]

Re: 120 to 140 loop vee carbs

finally got the carbs done, timing set at 6 instead of the 8 it calls for to finish breakin. now if i can get truck running to get it to water to finish pier side. am going to change head gaskets as insurance just to be safe, along with conditions of cylinders.<br /><br />clanton-- was able to read on one piston it has 398699 stamped on it. my 1990 parts manual starts with a 432969. any help on year of piston if not thats cool was just checking along with update.<br /><br />hope everyone had a nice thanksgiving.

 

[clanton]

Re: 120 to 140 loop vee carbs

The timer 583508 number started in 1988, the piston 398699 is 1988 port side,standard size.