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Old 07-09-2007, 09:47 PM
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Default Yamaha Pro V 150 (1990) Issue

Hi all new to the forum. I have a Yamaha Pro V 150 1990. I had the boat on vacation for 9 days and it ran great. I took it out yesterday and I had the following problem. When getting up on plane it took off fine then the power just dropped. It seems like after I ran it for a while it would get better but not great. I could run it at around 3000-3500 RPM's and it was okay, still some surging. But when I would hammer it it would run great for 15-20 seconds then loose power again. I checked the fuel filter on the motor and it was fine. I looked around for any obvious problems and seen nothing. Thanks in advance for your help...

Mitch...
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Old 07-10-2007, 07:27 PM
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Default RE: Yamaha Pro V 150 (1990) Issue

Mitch,

Take it out and hit the choke switch while it is hesitating. Does it pick up rpms for a bit? If so......you have some kind of fuel delivery issue. Whether its the carbs, weak fuel pumps, boat fuel filter clogged, fuel tank pickuprestriction or tank vent issue are allitems to check. Also try pumping the primer bulb when it is hesitating. Do the rpms pick up with that?

Andy
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Old 07-12-2007, 11:45 PM
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Default RE: Yamaha Pro V 150 (1990) Issue

Andy:

Thank you for your reply. I'm a first time boat owner. I bought the boat 1.5 months ago. I have ran about 3 or 4 tanks (24 gal. tank) of fuel through it. Not a lick of trouble until last weekend. We did try to pump the bulb while it was having the problem. The ball was tight and it didnt help, I didnt try the choke switch though. Also I didnt add anything to the fuel like Ringfree. After reading everything on the net about it do you think this could be the problem? I looked at the fuel line from the tank to the motor. The only filter was the one on the motor. I took it off and cleaned it. Should I install another filter between the tank and the motor? My tank is plastic and made by INCA Molded Products. I want to take out the pickup line but Im afraid I'll lose the nut or what ever is holding the fitting inside the tank. The tank does make a wheezing noise when I pump the bulb. Is this normal? Im pretty mechanacally inclined and not afraid of working on it however I have never owned a boat so thats why Im asking so many questions. I plan to take it out this weekend and try the Ringfree and the choke switch. Is there anything else to try that could lead me to the problem?

I thank you for your time!!!

Mitch...
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Old 07-24-2007, 10:54 AM
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Default RE: Yamaha Pro V 150 (1990) Issue

I tried Seafoam...didn't help. Also hitting the choke switch when the problem occurred cause the RPM's to go down. Had a compression test done. All 6 are between 110 and 115. Spark test was good. Found water in the fuel. I'm installing a water separator filter and draining and flushing the carbs. Ant other ideas?

Thank You,

Mitch...
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Old 07-24-2007, 10:11 PM
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Default RE: Yamaha Pro V 150 (1990) Issue

Mitch,

Good idea on the water sep filter.

Is that fuel tank vented? It should be. Check that and the anti-siphon valve if you have one installed.

What do the spark plugs look like? Color?

All else fails........I would still physicallyremove and go through the carbs. If all you ever had was the engine mounted fuel filter and no boat mounted filter, I would think that you could have some crud in them. If you are not sure what you are doing........take it to a dealer or independent tech that does.

Andy
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Old 08-04-2007, 09:56 AM
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Default RE: Yamaha Pro V 150 (1990) Issue

Andy:

I installed the filter, drained and flushed the carbs, it didnt help. Tank is vented, no problem there. Anti siphon checked okay. Spark plugs are new so nothing to add on the color. However they do seem to be wet when I take them out. I'm starting to lean towards ignition issue or too much fuel. Maybe a coil or the CDI. What is the cost of a new CDI unit? I ordered a tech. manual. I plan to test the ignition componets. I also plan to take it to the lake and test the spark on each cylinder with a timing light. Any other ideas or thoughts are welcome.

Thanks,

Mitch...
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Old 08-04-2007, 11:05 AM
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Default RE: Yamaha Pro V 150 (1990) Issue

Mitch,

So then you are saying you removed the carbs, took them apart, cleaned them and installed rebuild kits and you are still having a problem?

Andy
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Old 08-06-2007, 12:07 PM
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Default RE: Yamaha Pro V 150 (1990) Issue

Andy:

I removed the drain plugs on each carb (6 total) one at a time, then I flushed them by pumping the bulb several times.

Thanks,

Mitch...
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Old 08-21-2007, 10:21 PM
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Default RE: Yamaha Pro V 150 (1990) Issue

Okay...I rebuilt the carbs...installed a water/fuel seperating filter...replaced the fuel lines and primer bulb...tested the fuel pumps. Still with the problem. Tonight I started the motor in the dark to check for spark jump...there was none. I started removing the spark plug wires one at a time with insulated pliers. I found they all had spark, it seemed to be good blue spark...I could see it jumping from the plug wire to the spark plug. However I could remove the top two wires on the port side and the middle wire from the starboard side all at the same time and there was no difference in the way the engine ran. Any ideas???

Thank You,

Mitch...
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Old 08-21-2007, 10:33 PM
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Default RE: Yamaha Pro V 150 (1990) Issue

Mitch,

Running on muffs with no load, you may very well not see any difference in rpms. The best way to test that is either bump the rpm up a little and try, or in the water under load and remove a plug wire at time. Under load you should see that drop off when disconnecting a plug lead.

Compression testedgood in all 6?

Andy
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Old 08-21-2007, 10:40 PM
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Default RE: Yamaha Pro V 150 (1990) Issue

Andy:

Wow you are fast. Yes compression tested 105-110 on all 6. Andy it was not just a RPM change. When I had the three plug wires removed and tried to remove one of the remaining three the motor would die. It really seemed to me that the first three wires I removed were not in the game at all.

Thank you very much for your hepl!

Mitch...
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Old 08-24-2007, 11:11 AM
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Default Re: Yamaha Pro V 150 (1990) Issue

Andy:

I ran the RPM's up to around 1800 and tired it again. Still no change when the top two port side plug wires are removed. I switched coils and spark plugs around with the same results. The plugs in the top two port cylinders are wet when I pull them so I know they are getting fuel. Could it be a bad stator, charge coil or pulse coil? Or am I way off base here?

Thanks,

Mitch...
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Old 08-24-2007, 11:14 AM
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Default Re: Yamaha Pro V 150 (1990) Issue

Mitch,

I thought you mentioned that you tested for spark up there ^^^^^^^^^ and that you had spark on all 6 cylinders. Do you have spark or don't you? A spark tester is best or a timing light works for this.

Andy
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Old 08-24-2007, 11:23 AM
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Default Re: Yamaha Pro V 150 (1990) Issue

Andy:

Yes I do have spark on these cylinders in question. Could it be the spark is too weak even though its present?

Thanks,

Mitch...
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Old 08-24-2007, 12:46 PM
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Default Re: Yamaha Pro V 150 (1990) Issue

Might be weak.........but that is what a spark tester is for.

How did you check for spark? If there was no spark on the 3 cylinders out of 6.....I doubt it would even start and if it did......it would run like crappola.

Andy
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Old 08-24-2007, 01:07 PM
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Default Re: Yamaha Pro V 150 (1990) Issue

Andy:

I checked it with a timing light, all six are firing. It will start actually very easy but it is running like crapolla!!! I'm going to try squirting some premix into the carbs of the cylinders in question and see how it reacts. Do you have any other ideas or suggestions?

Thanks,

Mitch...
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Old 08-25-2007, 11:19 AM
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Default Re: Yamaha Pro V 150 (1990) Issue

Andy:

I checked spark with a spark tester. They all were jumping a 1/2 inch with blue spark. I also squirted premix into the port side of the top two carbs with no change in RMP's. I'm wondering if I'm getting too much fuel in those cylinders. Or if I'm getting too much oil from the injection system. I turned the port side top two idle mixture screws in and backed out 1/2 turn but it didn't help. The spec calls for the port side to be at 1 - 1 1/2 turns and the starboard side to be at 1/2 - 1 turns. I'm about ready to throw in the towel...I'm running out of ideas. Does anyone else have any more suggestions? I just want to go fishin!!!

Thanks,

Mitch...
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Old 08-27-2007, 05:25 PM
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Default Re: Yamaha Pro V 150 (1990) Issue

Mitch,

You can do this at your discretion(insert SIM disclaimer here please) but I would tie it to a solid dock or take it out with a freind and run it under load at the rpms where the problem shows itself. Pull a spark plug one at time and re-connect after testing each. You should get a solid drop in rpms on every cylinder. No change means you found the problem cylinder. A change in each means they are all firing and its not a lack of spark. Might want to check and see if you have proper timing advancement while you are at it.

Also your fuel squirttest...........did you do this under load in the water or on muffs?

Andy
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Old 08-27-2007, 08:54 PM
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Default Re: Yamaha Pro V 150 (1990) Issue

Thanks Andy.

I'm not sure I have the kahunas for the dock test but the buddy idea sounds good. I did the fuel squirt test on the muffs at about 1800 RPM's. Question is the ProV 150 a crossfire system? Or does the carb barrel on the port side fuel the port cyclinder? Also a thought occured to me. Could this be a blown head gasket. The two cylinders in question are right next to each other? The compression test was 105-110 for each cylinder so this probably is not the problem. I've never had a head off this motor so I'm not sure how things are layed out under there. Is there an easier way to test for a blown head gasket or is removing the head the best way?

Thanks,

Mitch...
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Old 08-28-2007, 10:23 AM
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Default Re: Yamaha Pro V 150 (1990) Issue

Do you have a leak down test tool? Put each one at TDC and check them that way. Make sure the engine is warmed up before doing so.

Off the top of my head.........I am intimently familiar with that engine. I would have to find a manual from back then to see how it is setup.

Andy
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