1995 Johnson 130hp Carbuerator Question

[Striper500]

I have a bad misfire which after doing all of the electrical checks as per the OMC book, my next step was to look at the carburetors. In reading the manual (which I am almost certain is the correct one) it references an"internediate air bleed orifices " in the upper left corner which I checked and there didn't appear to be any blockages. According the manual - right below that is an "adjustable Idle Needle Screw". The manual, speciffically tells you to turn this screw all the way in, unitl it is seated and then turn it out 2 1/2 turns. Oddly enough this was not a needle screw, but another orifices which was marked "33". Could this be possible ? would the manual be wrong ? Even the air cleaner has a reference / sticker to this "idle needle" which tells you the way to turn it to make it richer or leaner. The orifice itself "33" had nylon in the center of it. Was the idle adjustment needle replaced by an orifice ? The manual shows this "idle needle" as looking like a flat head screw.

 

[OBJ]

Re: 1995 Johnson 130hp Carbuerator Question

Striper, post your model number. There was a variation in carbs depending on the model suffix letter. Or you can check it out at the BRP site.....if it's up. Do you have BRPS addy?........just checked, it's still down.

 

[Striper500]

Re: 1995 Johnson 130hp Carbuerator Question

It is Model # J130TXA0...Please let me know. Your help is appreciated.

 

[OBJ]

Re: 1995 Johnson 130hp Carbuerator Question

If the model number has a suffix of "A" or "R"...as like....J130TXAO (A) or (R), the needle will be in the upper left area of the carb. If the suffix is "P", the needle will be in the lower left of the carb. Which manual do you have, OEM or generic...Seloc or Clymers?

 

[Striper500]

Re: 1995 Johnson 130hp Carbuerator Question

The last letter of the model is an R which is not on the certificate of origin - but it is on the engine - J130TXA0R
The manual is an OMC factory manual - electrically this engine was checked out to the letter - a little background - this boat was bought as is - I have no history - here's my problem in a nutshell - I'm checking the engine step by step out of the manual - but there are no "needles" I know this sounds crazy - but for all I know some turkey took them out - I have an air bleed orifice and just below that where a needle should be is another orifice - # 33 to be precise - it's brass and looks like the air bleed orifice but if you look at it closely the center of the brass orifice hole seems to be made out of nylon - as dumb as this sounds - should there actually be some type of needle here ??? and if anyone knows whould the engine run like it is with no needle in there - ie msifiring - but running - When I look at the manual picture I should be looking at what looks like the head of a screw (needle) that you can turn with a flat blade screwdriver - instead it's an orifice - Anyone ???

 

[OBJ]

Re: 1995 Johnson 130hp Carbuerator Question

Does the orifice in question have a slot that can be used to remove it?

Been looking for a model that would have a capped orifice but can't find any. I want to say that it sounds like someone has chucked the needles and just put in plug screws. No reason I know of that an orifice would have a nylon center unless it's being used as a seat. May dhadley or one of the other guys will stop in and have an answer.

 

[Striper500]

Re: 1995 Johnson 130hp Carbuerator Question

The orifice does have a slot similar to that of the intermediate air bleed orifices. It can be removed with a flat head screw driver.

 

[OBJ]

Re: 1995 Johnson 130hp Carbuerator Question

I just edited my last post. I've seen some of these loopers but never really paid attention to what the needle vlv seat was. Mostly looking at other problems other than carbs.

 

[Striper500]

Re: 1995 Johnson 130hp Carbuerator Question - Help Dhadley

Re: 1995 Johnson 130hp Carbuerator Question - Help Dhadley

Dhadley, I was wondering if you could review the following scenario and let me know your thoughts.

 

[Dhadley]

Re: 1995 Johnson 130hp Carbuerator Question

Your version of the 1995 130 (R) has the fixed idle and intermediate air bleeds. There is no adjustible needle.

The upper of the two air bleeds is for the mid range and should be #33. If one of those was plugged with plastic it should have made a huge difference when you cleaned it out. Don't force whatever it was into the passage to clear the jet, remove it and then clean it out.

Let's look at the miss itself. Describe exactly what it's doing and when. Has it ever run correctly since you've had it? If so, when did this issue start? Right after a plug change or cleaning? BTW - what plugs are you using?

One more thing -- don't run the motor under a load with the air box cover off. It'll lean out.

 

[Striper500]

Re: 1995 Johnson 130hp Carbuerator Question

Dhadley, thanks for the response. I recently purchased this boat in Feb, and it has never run correctly for an extended period of time. The spark plugs being used are Champion - QL78YC. I would say that this engine has a bad misfire. A loud pop maybe once every 20 seconds or so, and will not allow the boat to plane. To date I have done almost every electrical test as per the OEM Johnson Manual. These tests include ground test, output test, and ohm meter test on the stator, timer base and power pack. Everything seemed to have checked out with the exception of the stator ohm meter test. The manual said that the reading should be 480 +/- 50 OHMS. I had two OHM meters which both read 370. Any issues with this ? The power pack was installed last Nov, before I purchased the boat and seems to be hooked up properly. I also have new coils and plugs. There was one point in the river last weekend, where the boat seemed to run ok at low speeds for about 10 mins.

 

[Dhadley]

Re: 1995 Johnson 130hp Carbuerator Question

Ah, a loud pop. We'll assume it's coming out the exhaust. Let's look real close at the wiring. Look very close at the primary wires from the pack to the coils. Follow the color coding and make sure the right wire is hooked to the right coil. And make sure the spark plug wires are not crossed. The top coil fires the top plug.

 

[Striper500]

Re: 1995 Johnson 130hp Carbuerator Question

Correct. The loud pop is coming out of the exhaust. All of the wires are hooked up to the correct coils, and plug wires to cylinders. Any ideas ? thoughts on the stator not passing the ohm test ? is it possible the cylinders are firing out of order ? could a sensor coil cause that ?

 

[Dhadley]

Re: 1995 Johnson 130hp Carbuerator Question

There are a couple of things that will make it backfire out the exhaust. The most common is the wrong firing order. The next step is to mark the flywheel on each cylinder.

#1 is already done. Take something like White Out and mark the line that is top dead center when it's lined up with the timing pointer. None of this has to be accurate to the nth degree. Above this line put a "1".

With the plugs out roll the flywheel over until each piston is at the top. Draw a line on the flywheel at the timing pointer. Above each line write the number of the cylinder. The top starboard cylinder (highest) is #1. The top port is #2. Bottom starboard, #3. Bottom port is #4.

Put the plugs in and start the motor. With your timimg light on each cylinder you should see that number. If you see two numbers that are wrong, that's the 2 that are crossed.

Remember, we're not looking for exact degrees, just if the right number comes up.

There's other things to look at but you have to start with the basics. Let us know how that works out. If this is OK, the ignition is probably good.

 

[Striper500]

Re: 1995 Johnson 130hp Carbuerator Question

Dhadley, thanks for the advice. I was wondering if anyone could tell a story from the pictures of the spark plugs I took today. Keep in mind these plugs were purchased brand new only a week ago, and have no more than 1 hours worth of time on them. They are in this order - lower port(carboned up), lower starboard (wet), upper port (carboned up), upper starboard (wet). As you can see by the pics -the starboard side of the motor has wet plugs, whereas the port side has plugs that are carboned up. Can anything be told from these pics ? <img src="http://groups.msn.com/_Secure/0SACqD1kVyRSkerBbGb72FzUnQhUaPbeLjbLiGenER*w5sNwkRrwa3YI7t80vAKFN7ebsuK2dLAiNsvYkAUMms*PEZ!UEWhckQoSFnh!IkoFbAAAAynIUAg/LowerPortCarbon.JPG?dc=4675613085680523842">
<img src="http://groups.msn.com/_Secure/0SgAWDjEW71E3XHCdMWbC61vZ96SAXaYyCLthxpubWcx6JPkI4PcpcDe8EFPt96R6v5q8!n3iYfNJKZ8Jh90CHyAaL5do1uQLtMYTNZoH0K5aujTGz5dRCw/LowerStarboardWet.JPG?dc=4675613085682194107">
<img src="http://groups.msn.com/_Secure/0SAAzDlwVqBXiKqqk0Fb79nYOS5GBv0dkAIA3S7FvnkPS9ok4RkgdLRsfFXhGLTLv*b59Wouxg2v9Nne3U6UKUFglVOI0Ap0!1dFE5p6wx7WAAAAAynIUAg/UpperPortCarbon.JPG?dc=4675613085683636897">
<img src="http://groups.msn.com/_Secure/0SgCzDzQW1FKDjlJbQtKZTJCBcReTNa7wNX4h1fon6i62*8kl3ZFzX*OHtFGu*ZrT!rzyifDuutMeNGu0kQquhdYeCtzJ5WSjIkUbuTEAuLU2CWnPngOk7g/UpperStarboardWet.JPG?dc=4675613085685125819">

 

[Dhadley]

Re: 1995 Johnson 130hp Carbuerator Question

The dry sooty ones are probably the ones crossed. There are other possibilities but once we run the motor and check the firing order we'll eliminate one thing. Then it's on to the next if that's not it.

 

[OBJ]

Re: 1995 Johnson 130hp Carbuerator Question

I've been trying to find that model with fixed jets in the parts book and can't find it. Got the "R" models listed but they have needles. :$

 

[Dhadley]

Re: 1995 Johnson 130hp Carbuerator Question

I'm looking at the microfiche rather than a paper catalog maybe that's the issue. The A & R motors have the "older" fixed jets. The P motor has the "newer" adjustible idle jet. (Mid year, running change). Both use the newer style "thumbscrew" airbox.

 

[Striper500]

Re: 1995 Johnson 130hp Carbuerator Question

Dhadley....thanks for looking into this. You are correct - I confirmed through Bombadiers website that the carbs are fixed, i.e. no adjustment needle. For all of those interested you can go to Bombadiers website and search for the exact schematics of your motor using the model #. It turns out that the two there are two orifices on this motor marked "33". The idle needle for this motor is fixed (non-adjustable). I will let you know when I do the timing gun tests to see if everything is firing in order. Unfortunately, it may be a week or so until I get back to you.

 

[JC1933]

Re: 1995 Johnson 130hp Carbuerator Question

Hi striper 500,

I have the same motor 1995 130 model # J130TLEOA
look at 11'clock on your carbs there should be a slotted screw that is the needle valve, Hope this is of some help to you.