JOhnson 150 2001 2 stroke oceanpro wouldn't go over 2k rpm on the way in.

[Jquest]

Well...I"m really starting to dislike my engine. Anyway.. to the point. Went out this morning. Everthing was fine. I was hitting 4.5k through the water as I was heading out. Boat was really moving. If I would of gone faster...I might of bounced some people over the side. he..he..he.. Anyway...got out there. Told me buddys it was sandwich time, I let them rig up and did some trolling. Went for a bit. Everything fine up to that point. Decided to due some bottom fishing. Stopped the boat and anchored. <br />Here comes the fun part. Decided it was time to call it a day. Fired up the engine. I was having a small problem with it. It came up at 1K. Then after like two seconds...it would fall to 600 rpm. Turned off once or twice. No biggy. Turned it on and gunned it. As I started to rev up...the engine would not go passed 2k I said...fine. It's done this off and on before(heading out ...the engine looses some rpm.This happened in the past , before I took off the heads).<br />In the past I would pump the bulb thingy and hit the trottle and it took off again.(hopefully this is a major clue). <br />Back to my day....Maybe some air in the line. Went for about 2 minutes. Still at 2k. I felted it once trying to engage and rev up , but then it fell back. Just wouldn't do it. I tried priming the bulb. NOthing. One thing about the bulb. I prime it hard. once I gets going..it gets soft again, but the engine doesn't turn off. So it's getting gas. I also opened up the cap on the gas tank to see if maybe there was a suction problem and needed some air. I was trying anything.<br />Anyone have any idears????<br />Unknown factors.<br />I just finished replacing the seats on my t-stats.<br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=020890 <br />I was thinking. LOST COMPRESSION??? But how come I hauled Arse out there and all of a sudden it does this? I was going for about 30 minutes at a good click something should of happen there?<br />Unknown factor two. <br />I switched from Yamalube to Premium 2-Cycle TWC-3 Engine Oil from West Marine. Could it be the new oil? Since it's ashless...could it of loosen something in the oil line to clog up or restrict the carbs?? <br />Finally...got home cleaned the boat and ran the motor to flush it. AFter it warmed up... I ran a compression check. Cylinders 1-6 all gave me 90psi. The way I did it was.... put the compresion tester in and on "neutral" turned the engine. It was hard to do cause my engine fires up in like a second. No misfires nothing. It purrs and no spuddering or anything like that. That's why I can't see loosing compression as the problem( maybe I'm wrong , hope not)?<br />I guess the fuel system leading to the engine is my next route?? Anyway tips in where to start? Still new at this and learning.

 

[duck64]

Re: JOhnson 150 2001 2 stroke oceanpro wouldn't go over 2k rpm on the way in.

my johnson 115 did about the same thing, i was told by 20 people to try different things. a guy i work with who goes out almost everyday told me to buy some chemtool b-12 from auto parts run in with gas 2 times. i did and my motor has never run as good. it may work for you.

 

[rickdb1boat]

Re: JOhnson 150 2001 2 stroke oceanpro wouldn't go over 2k rpm on the way in.

Sounds like the motor is going into the S.L.O.W. mode, due to a possible overheating condition. They do this to protect the engine against major damage. The powerpack controls this. Check your engines temp and see if it's OK. See if you can put you fingers on top of the powerhead for a few seconds and not geted burned. Or better yet, go to a dealer and get some thermomelt sticks and make a mark on the head and see if it melts.

 

[Jquest]

Re: JOhnson 150 2001 2 stroke oceanpro wouldn't go over 2k rpm on the way in.

THe engine was running cool. I just finished redoing the cooling system. I could put my hand on top of the head, very briefly, so I don't think it was hot.I was getting on average about 140. Never got passed one 160 all day. And...since I was bottom fishing for a while....the engine was cooler when I started up. I don't think it's a heating problem cause the engine ran hot before and ran fine.<br /><br />Chemtool B-12 huh....I guess that would be the cheapest way to start off.

 

[Jquest]

Re: JOhnson 150 2001 2 stroke oceanpro wouldn't go over 2k rpm on the way in.

ok.... today I took of the cover off the engine. Saw that I had oil even on the cover for the carbs. Looks like I have an air leak in the fuel line. I worked my way back from the motor( bulb and so on). Then I remembered that under the console were the water separator filter is....it stinks like gas most of the time in there. Now....if everything is thight and secured...I see no reason to smell gas in there. Soooo...I went to the two lines going into and out of the filter. Turns out that the line going from the filter harness to the back(to the bulb) was loose. MOving it back and forth...I was able to pry it out of it's connection. I do believe it's not supposed to due that. Anyway....Looks like I have found my air leak that was causing the vro pump to dump excess oil into the engine. NOw....since the boat was sluggesh coming in. I believe my plugs were fouled. So I'm putting in new ones. Now comes the part I need a little help in please. "Decarbing". I've heard the term in here. What is the best suggested way to decarb the carbs to help get some of that oil out of there so my boat engine can snap back into shape?? bmcgee1 suggested a shot of B-12 into the tank. Is there something else I could do straight into the carbs??<br />TIA!!!!

 

[Solittle]

Re: JOhnson 150 2001 2 stroke oceanpro wouldn't go over 2k rpm on the way in.

Jquest - Go to the red search at the top of the page & enter decarb & read away.

 

[Jquest]

Re: JOhnson 150 2001 2 stroke oceanpro wouldn't go over 2k rpm on the way in.

Ok....I'm back and the saga continues. I went out twice. The first time the boat did it a couple of times starting off. Turning the engine off and on a couple times seemed to solve it for the time. The rest of the day..it didn't do it. Went out a second time the following weekend ...and the engine never did it.IT hesitated a couple of times ,but it came out of it. AFter that...s Spent the whole a'noon at WOT and ran smooth. So...I had to work a couple of weekends(3, turned over the engine at least once a week). Went out last weekend. Right off the bat. BAM!! The engine leaving the pier goes right into that mode. <br />I tried Sea foam to see if the carbs were clogged up. I disconnected the amphenol 4pin plug for the VRO and the plug 2line connection for the oil tank. I got a small tank and hose kit. I mixed 50:1 slapped it on the engine and cranked it up to make sure it worked right. This weekend I went to a large canal, with a public access ramp, by my house were I could throw my boat in and do a test run without having to pay the pier costs. Engine cranked up fine. Warmed up. NO mis-fires NOTHING! Hit the throttle and Kaplunk! The engine wouldn't go over 2k. Reading the threads here and suggestions...I came across the S.L.O.W. thingy. I disconnected the plug to the sensor on the port side when the engine was off. Fired it back up and still nothing. <br /><br />One thing I've noticed. I don't know if this will help,but it might fire up a lightblub in someone's head. My alternator reading is high. When i crank up the engine...it's like in the 3/4 position ( like a gas tank that is 3/3 full). When I go WOT...it goes out of the green range on the high side(this is when the engine could still make it above 5k). Just a little on top of it. Could this be causing some type of circuit to fire off and not let me go WOT?? Another thing is....I can put the shift trottle in neutral and rev the engine all the way to 5k. But with a load...it won't do it. Did this in the water by the way...<br />I'm pretty close of just taking it to a wrench. I don't know what else to do and I'm not going to start buy Vro pumps, powerpacks and stuff. <br />PLease....any suggestions??

 

[DJ]

Re: JOhnson 150 2001 2 stroke oceanpro wouldn't go over 2k rpm on the way in.

Jquest,<br /><br />I do not know what your exact problem is, yet I'll give this advice.<br /><br />Do not rev the engine to 5K in nuetral. You will need a wrench if you do that a lot.<br /><br />A multi cylinder outboard will run fine, under no load, on just a few of its available cylinders.<br /><br />Do you have a fuel/water seperator? When was the last time it was serviced?

 

[Jquest]

Re: JOhnson 150 2001 2 stroke oceanpro wouldn't go over 2k rpm on the way in.

THank you for the ADvice DJ. I only did it once. I guess you could say out of fustration. Won't do it again. <br />On the fuel/water seperator....I changed it a month back. I thought that might of been the problem. But that's the thing. I used a portable tank this time, with a new line into the vro just to eliminate everything up to the engine. STill did the same thing. I"m starting to think it's something electrical if you say it can still run good on only a couple of cylinders. Any suggestions my friend??? Or....how do I or what's the best way to check the power pac??