Yamaha 2004 150 carb

[jerryjerry05]

The motor runs great
(mostely) , new impeller, thermo's,plugs,etc
Running for about 1 mi. and then alarm sounds off and goes into limp mode(?)
Back to idle and then it can be ran up again.
Not overheating(tested) pretty sure the oil system is the problem.
Cleaned both tanks and got the sludge out from the bottom.
I figure one of the sensors is the problem(?)
Opinions?? what can I test or just replace the sensors??
Thanks

 

[boscoe99]

Three switches in the main oil tank sensor assembly. If and when the bottom switch closes due to low oil it will send a ground to the CDI. In which case the alarm will sound, RPM reduction mode will be activated and if a Yamaha tachometer is installed a light or icon will illuminate.

 

[99yam40]

The motor runs great
(mostely) , new impeller, thermo's,plugs,etc
Running for about 1 mi. and then alarm sounds off and goes into limp mode(?)
Back to idle and then it can be ran up again.
Not overheating(tested) pretty sure the oil system is the problem.
Cleaned both tanks and got the sludge out from the bottom.
I figure one of the sensors is the problem(?)
Opinions?? what can I test or just replace the sensors??
Thanks

backing off resetting something letting it run back up makes no sense too me.
when does the alarm shut off?
do you have gauges that indicate ?
have you watched the level in oil tank?

 

[jerryjerry05]

The gauges are unreadable
The alarm shuts off when you bring it back to idle, then it can be ran back up to speed. Something resets in the system and the alarm stops and it can be ran fast again. The motor slows down then the throttle is pulled back then the alarm stops and it can be sped up again,
The oil pump is working keeping the 2nd tank filled like it's supposed to.
The tanks were cleaned and full with new oil.

 

[99yam40]

you will have to do some trouble shooting to figure out what is happening, but nothing I know of normally would do that.

since low oil and overheat are the only things that should set the alarm that I know of it should be easy to figure out which of the switches or wires is doing that.

seems like I have read low voltage on some motors would set the alarm and RPM limit

if you get your gauges to working it would help point a direction to case
here is a place that can recondition your gauges

Home - GaugeSaver

Specializing in restoration of aged, sunburnt, or faded Liquid Crystal Displays. Holiday Hours Closed Dec. 23rd – Dec. 27th and Jan. 1st Current Turn-Around Time: 3-4 weeks, thanks for your patience Request Service We Service More Than Just Gauges Marine electronics, Chartplotters, VHF radios...

gaugesaver.com

 

[jerryjerry05]

thanks