2000 Yamaha high thrust FT50BET Prime start

[richfras]

Hi does anyone have a good description of the operation of the Yamaha prime start system for a 2000 Yamaha 50 four stroke? I have checked the manual and it would appear the choke solenoid needs a signal from the thermoswitch to operate? does this mean in a normal condition the choke is on and as the engine warms it goes off? also what is the function of the electrothermal ram and how does it interact with the choke solenoid? Any help would be gratefully received.

 

[99yam40]

Best I can tell,
the start switch, when turned to the start position sends power to the thermal switch 2 with the brown wire .
if the Thermal switch/motor is cold/closed it heads to the choke solenoid

 

[richfras]

Best I can tell,
the start switch, when turned to the start position sends power to the thermal switch 2 with the brown wire .
if the Thermal switch/motor is cold/closed it heads to the choke solenoid

Problem is according to the manual the thermal switch only closes at 35degs? which means it needs to heat up to actvate it?

 

[99yam40]

since it says thermal switch 2, there should be more than one.
you need to make sure you are looking at the proper switch, and test it to make sure the manual is correct.
I have found things wrong in manuals before

 

[richfras]

since it says thermal switch 2, there should be more than one.
you need to make sure you are looking at the proper switch, and test it to make sure the manual is correct.
I have found things wrong in manuals before

Thermal switch 1 is the overheat switch it is set at 85 so sounds correct

 

[99yam40]

Thermal switch 1 is the overheat switch it is set at 85 so sounds correct

I meant check to make sure it is a NO or NC switch,

makes no sense to have the choke only work on a hot motor