1998 Yamaha F50 fuel enrichtment system how does it work?

99yam40

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Is that peak voltage, DC, or AC?
what are you using to measure the voltage and where are you placing the meter leads?
was the heater unit connected while testing?
 

robert graham

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Primestart is a Yamaha term for any automatic fuel enrichment system. They are not all the same.

Primestart on an EFI F350 or the latest XF425 direct injection model is completely different than Primestart on two stroke models.
 

Andersen222

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Is that peak voltage, DC, or AC?
what are you using to measure the voltage and where are you placing the meter leads?
was the heater unit connected while testing?
It’s getting 6-7 volt DC in idle.
I unpluged the thermal heater, and measured direct on the cables leading to the thermal heater with a voltmeter, while the engine is idling.
 

99yam40

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trace the wires back to the lighting coil or rectifier regulator to see if it runs off of the DC side of RR or the AC side.

I would think that your battery charging would be having a problem if the RR only puts out 7 V

better yet see what your service manual says the specs are for that heater unit during testing
 

Andersen222

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The voltage is recieved from the lightning coil, should it put out 12 volt the moment the engine is started?
Because it is charging the battery fine?

the problem is, i haven’t been able to find a service manuel for this engine yet….
I can only find the manuel for the model newer, with the primestart mounted on top and inside the carbs…
 

boscoe99

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Aug 22, 2013
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The voltage is recieved from the lightning coil, should it put out 12 volt the moment the engine is started?
Because it is charging the battery fine?

the problem is, i haven’t been able to find a service manuel for this engine yet….
I can only find the manuel for the model newer, with the primestart mounted on top and inside the carbs…
Did you not read or understand post #6?

In what country are you located?
 

Andersen222

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#6 with the picture of the manual i just a empty page when i click on it.
Was hoping to find a free version as pdf to download.

im located in Denmark.
 

boscoe99

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trace the wires back to the lighting coil or rectifier regulator to see if it runs off of the DC side of RR or the AC side.

I would think that your battery charging would be having a problem if the RR only puts out 7 V

better yet see what your service manual says the specs are for that heater unit during testing
Delete.
 

99yam40

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get the manual part number from post#6 and do a web search to see what you can find.
Yamaha's manuals are copy righted material, go luck finding them free
 

99yam40

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look this up online.

YAMAHA OEM OUTBOARD SERVICE MANUAL LIT-18616-01-97​

remove your e mail address from the post above and send Boscoe a Private Mesage
 
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