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Yamaha VMAX 200hp ALARM ISSUES

Old 12-23-2018, 09:16 PM
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Default Yamaha VMAX 200hp ALARM ISSUES

Problems...
The boat starts, runs, etc....BUT, once i'm on plane making a short run to my next spot, an alarm sounds(it's a constant beeeeeeeeeeeep) and it shuts my motor down below 2000 rpm's causing me to take water due to the abrupt slowing. I shut the key off, the alarm shut off. If i try to restart immediately, the alarm is still sounding. After several attempt at turning on and off and in gear and out of gear(basically anything i can trick it to do), it finally goes away. I then take off, jump up on plane and it will allow me to run a couple minutes or so before it happens again.

My attempt to fix..I read up on some forums and was told to replace the water impeller/pump(in which I did), replace the thermostats( in which i did) and the problem still exist. I also ran the motor at the launch and it still happened. At that point I also removed the oil reservoir under the hood and messed with the float sensor(which did nothing). Alarm still sounded.

Conclusion...NEED HELP!! Problem Still Exist!!!
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Old 12-24-2018, 06:38 AM
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Digital or analog gauges ?
i would start by checking oil level on motor as soon as alarm kicks on
and change oil filter on remote tank
if it's an overheat, bring a handheld temp sensor to see if either side is overheating
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Old 12-24-2018, 06:50 AM
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Sounds like temp to me.
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Old 12-24-2018, 07:15 AM
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I had a similar problem with a 99í 150 VMax, similar story. Mine had a temp sensor that has corroded wires which was intermittently causing the motor to go into limp mode. I would suggest you check it out if you have already donít the impeller and thermostat. Itís a $100 part that is very easy to install, but I would make sure itís a temp issue and not a low oil alarm before throwing parts at it.
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Old 12-24-2018, 10:34 AM
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Analog gauges work as well as it still spits water when this happens.

I just purchased the 2 temp sensor wires last night. Figured sense I replaced thermostats, I will replace those next.

question....I've been reading up on this and some people suggest the kill switch being faulty, but this alarm doesn't kill the motor, it puts it in a safe low rpm mode
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Old 12-24-2018, 10:36 AM
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Originally Posted by wetneck View Post
Digital or analog gauges ?
i would start by checking oil level on motor as soon as alarm kicks on
and change oil filter on remote tank
if it's an overheat, bring a handheld temp sensor to see if either side is overheating
Oil level is fine. It's full in the tank and the reserve as well. I even removed disconnected the float sensor when alarm was sounding. It still sounded.
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Old 12-24-2018, 04:11 PM
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CAREFULLY stick your hand in the pee stream when at normal temp and when alarm goes off to see if its hotter. I had a 150 merc do this with a brand new impeller and housing 1st trip out. It looked like the pee stream was good but sucked air or something. I had a shop do that and they used sierra parts. I bought merc stuff and all good.
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Old 12-26-2018, 12:20 AM
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Originally Posted by Castawaychris View Post
CAREFULLY stick your hand in the pee stream when at normal temp and when alarm goes off to see if its hotter. I had a 150 merc do this with a brand new impeller and housing 1st trip out. It looked like the pee stream was good but sucked air or something. I had a shop do that and they used sierra parts. I bought merc stuff and all good.

My boat did this before and after replacing the water impeller kit as well as the thermostats
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Old 12-26-2018, 09:03 AM
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Does it have the fuel screen reservoir under the cowl? Could it be full of water?
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Old 12-26-2018, 09:08 AM
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On the newer motors it can often be water in the on board fuel filter. That would be my guess.
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Old 12-26-2018, 12:48 PM
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Originally Posted by vandlor View Post
Does it have the fuel screen reservoir under the cowl? Could it be full of water?
it does, but it has fuel in it.
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Old 01-13-2019, 09:00 PM
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**UPDATE**
The weather has been really shitty in the PNW but I finally got it out on the water after just recently changing the sensor wires. Unfortunately, I still have the alarm. GRRRRR. I left the boat ramp and jumped up on plane and went down river about 5 miles. Ran like a raped ape!!. Then i idled for a few minutes checking out my side imaging on a spot I discovered. NO ALARM. I was thinking that I fixed it. Then about 35 minutes later, I decided to head back to launch. Jumped up on plan and ran it back, got about 2 miles into the 5 mile trip and it SOUNDED. rpm's dropped, took water over the back. I was pissed. I went ahead and shifted in and out of gear about 10 times and then it quick. I jumped on plane and headed back.
I was able to get back to the launch and when I slowed down, i heard a few knocks in the engine that didn't sound too pretty, so I shut it down. Started right back up and ran just fine. Need help. The F'n sucks!!
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Old 01-14-2019, 07:27 PM
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Did you drop foot and check impeller. Had this happen few weeks back, steady beeping, it was peeing fine. Checked my sensor wiring, even pulled them, ran fresh water through block thinking clogged channels, still beeped. Dropped the foot, the impeller was stiff. Popped in a new one, no issues.
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Old 01-14-2019, 07:39 PM
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What do you mean by drop the foot? The lower unit?
if so, I had this issue before I replaced the water impeller. It still does it.
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Old 01-14-2019, 08:27 PM
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Yamaha oem parts ?
housing also or not ?
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Old 01-14-2019, 08:38 PM
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Yes. All OEM. It came with a new plate too!
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Old 01-15-2019, 06:36 AM
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Where are you located? If that motor has seen salt water you might have internal corrosion in the water passages. Just a thought. Seen it a few times.
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Old 01-15-2019, 08:21 AM
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Originally Posted by _bassmaster_ View Post
Yes. All OEM. It came with a new plate too!
did you replace the housing
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Old 01-15-2019, 08:30 AM
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Originally Posted by Mrroo View Post
Where are you located? If that motor has seen salt water you might have internal corrosion in the water passages. Just a thought. Seen it a few times.
nah I do live near the coast but not close enough for salt water.
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