Synthetic 2 Stroke Oils - Current Minor Engine Issue

Not sure but I don't think you can disconnect the oiler on Yamahas. I was interested in doing this and the mechanic at the repair shop I trade with said no can do on Yammies. But it was a 200 HPDI. If your motor is carburetor that might make a difference, don't know for sure.

What position is your motor in when it get the alarm? Tilted up and it won't get as much water as it will if it's trimmed down. I know that sounds funny but keeping the motor trimmed down has helped me in keeping mine running while idling very slowly.

I use synthetic blend, Pennzoil, which I get from Amazon. Good price, good oil and delivered right to home.

This is a good post with a lot of info for others. You can use a contactless thermometer to check the engine at idle and wot to give you a baseline of the temps the motor is operating. And a water pressure gauge isn’t a bad install on the console for comfort.

Quote:

---

Originally Posted by Speckalator

Not sure but I don't think you can disconnect the oiler on Yamahas. I was interested in doing this and the mechanic at the repair shop I trade with said no can do on Yammies. But it was a 200 HPDI. If your motor is carburetor that might make a difference, don't know for sure.

What position is your motor in when it get the alarm? Tilted up and it won't get as much water as it will if it's trimmed down. I know that sounds funny but keeping the motor trimmed down has helped me in keeping mine running while idling very slowly.

I use synthetic blend, Pennzoil, which I get from Amazon. Good price, good oil and delivered right to home.

---

Tilted down most of the time.

It did it not 2 minutes into running at the courtesy dock warning up the other day.

I'm now wondering if I have some wires shorting somewhere. What stinks is when it alarms it goes into limp mode and i can't get on plane. Get on plane it stops.

I think you can disconnect the oil injection system on it. Some folks have told me to do it. I take good care of the engine and run it regularly (save for dead middle of summer). I haven't had trouble out of the oil system ever and run synthetic 2 stroke oils.

I guess I need to confirm if this is an electrical issue or an oil issue at this point to understand what to repair/replace.

I would get the service manual for your motor and find out just what sensors will trigger the alarm, and under what conditions.

The oil injection on my Suzuki is very complicated, I suspect your Yamaha is similar, it has 4 different sensors that will all trigger alarms and limp mode. One float switch that activates when the powerhead is full of water, a temperature sending unit, an oil flow switch (there is a screen there that will occasionally plug and cause an alarm), and the oil level sensor.

Disabling the oil injection can be as simple or as difficult as you want to make it. Some people just jumper the switches and unhook the throttle rod on the oil pump, others go all out and remove the pump and block off the hole, on some motors that means removing the powerhead.

I would lean toward repairing the fault, you seldom see problems with the oil injection on Jap motors like with Mercs and Evinrudes.

My druthers are to repair the root cause as well.

Waited too long to be able to edit above, but was going to add. I think I have one "buzzer" in the controls. Whether it is overheat or low oil or whatever other alarm functions I have, it makes the same sound. I will dig into my manual and try to figure out what the outputs are (conditions) that are triggering the alarm.

Let's say though it is the overheat alarm. It could be bad sensor - should be eliminated with new one. Could be the actual wires for the sensor shorting together and simulating an overheat alarm. Could be an actual overheat condition - caused by low water flow (I've replaced the impeller and impeller housing and taken the head off to verify the passages are clear. Noticed no reduced flow at the tell-tale. Installed a thermostat where I didn't have one before. Replaced thermostat housing gasket.) Could be an actual overheat condition - caused by low oil flow. (I drained the tank and made sure the level sensor was functioning and screen was not clogged. Maybe I got air in the system doing that? I see there is maybe an air bleed screw that can be utilized to purge air.) Pump runs off of the crankshaft. I will have to dig to make sure everything there is behaving.

It seems odd to me that I have the alarm when the motor is not really warmed up yet. Alarm went off right after launching while running at the courtesy dock. I idle away towards main river channel and it continues. Give throttle it bogs due to the limp mode feature. Eventually it "busts" out of limp mode and I can get on plane. Run WOT no issue, strong stream at tell-tale. Throttle down to idle and have no issues, no alarms. Supposedly you send more oil with more throttle as it "opens" a port wide open to flow that oil.

I can say this; nothing I have replaced (impeller rebuild kit, thermostat, temp sensor) has helped.

Quote:

---

Originally Posted by smashdn

Waited too long to be able to edit above, but was going to add. I think I have one "buzzer" in the controls. Whether it is overheat or low oil or whatever other alarm functions I have, it makes the same sound. I will dig into my manual and try to figure out what the outputs are (conditions) that are triggering the alarm.

Let's say though it is the overheat alarm. It could be bad sensor - should be eliminated with new one. Could be the actual wires for the sensor shorting together and simulating an overheat alarm. Could be an actual overheat condition - caused by low water flow (I've replaced the impeller and impeller housing and taken the head off to verify the passages are clear. Noticed no reduced flow at the tell-tale. Installed a thermostat where I didn't have one before. Replaced thermostat housing gasket.) Could be an actual overheat condition - caused by low oil flow. (I drained the tank and made sure the level sensor was functioning and screen was not clogged. Maybe I got air in the system doing that? I see there is maybe an air bleed screw that can be utilized to purge air.) Pump runs off of the crankshaft. I will have to dig to make sure everything there is behaving.

It seems odd to me that I have the alarm when the motor is not really warmed up yet. Alarm went off right after launching while running at the courtesy dock. I idle away towards main river channel and it continues. Give throttle it bogs due to the limp mode feature. Eventually it "busts" out of limp mode and I can get on plane. Run WOT no issue, strong stream at tell-tale. Throttle down to idle and have no issues, no alarms. Supposedly you send more oil with more throttle as it "opens" a port wide open to flow that oil.

I can say this; nothing I have replaced (impeller rebuild kit, thermostat, temp sensor) has helped.

---

My Suzuki is the same way, it has a monitor gauge that shows the oil level and stuff, and the buzzer is in the control box.

Yeah, you are supposed to bleed the oil system any time you disconnect one of the lines or oil tank.

You should be able to check the resistance of the temperature sender. You could also jumper it with a resistor that falls within the operating limits right at the CDI and rule out all of the wiring and the sending unit.

I checked the wiring diagrams and went out to the barn with a headlamp for a little look-see.

Pink wire and grey wire coming off of temp transmitter. They go into the cdi then to a harness and up to the control. It can throw the buzzer. I have no light.

There are several wires coming off of the oil level sender, one being a pink wire for an alarm that goes to the cdi and then out to the harness to the buzzer.

Temp sensor is brand new. Not saying it couldn't be the problem but I had a problem with the old one and still have the same issue with the new one in there.

I did monkey with the oil level sensor. Had problems before and have same problems now. I will bleed that oil pump though. Also, going to get out of the habit of topping that reservoir off since I see it may also have a high level alarm.

I also have a mystery grey wire that when two connectors are hooked up the alarm goes off at the turn of the key. It was unhooked when I bought the motor and I leave it unhooked. My wiring diagram didn't explain it well as to its true purpose.

Still fighting the issue. Took temp gun with me the other day. I think it is an oil issue. I have a strong stream out of the tell-tale.

When I got home I started by removing the oil reservoir. When I did I noticed that the oil level sensor was not fully seated. Got it put all the way on there and it dropped maybe 3/16" farther down into the reservoir. Perhaps the tip of it and the filter down there were somehow keeping the oil from flowing to the pump correctly? I will run it again and see.

I put the temp gun on the cylinder water jacket as soon as I pulled it out of the water. I could read anywhere from 180F to 140F depending upon where I shot. I am looking around the innerwebs now trying to find the specs for the temp sending unit and the expected temps for the cylinders.