yamaha 250 TXRX not warming up correctly

Y

Yama 250 fireman

Cadet
Joined
Jun 12, 2009
Messages
14
From cold motor is not having the higher idle (1200) and then comming down to 600rpm. Motor trys to warm up at 600, have to give it some gas to get going.

replaced- 02 sensor, low pressure pumps, spark plugs, and one spark plug cap that was reading zero. cleaned all filters, except for injectors.

Thanks guys!
 
cousinabe

cousinabe

Senior Chief Petty Officer
Joined
Nov 13, 2001
Messages
765
Re: yamaha 250 TXRX not warming up correctly

check your engine temp sensor/thermo sensor is in spec.
 
Y

Yama 250 fireman

Cadet
Joined
Jun 12, 2009
Messages
14
Re: yamaha 250 TXRX not warming up correctly

I ordered a service manual about 4 days ago, any chance on giving me a run down on this procedure or is it to involved?

Thanks again.
 
cousinabe

cousinabe

Senior Chief Petty Officer
Joined
Nov 13, 2001
Messages
765
Re: yamaha 250 TXRX not warming up correctly

Measure the resistance across the wires at the specified temps.

5c(41F):128k Ohms
20c(68F):54~69k
100c(212F):3.02~3.48k

Do you have a winky blinky?
 
Y

Yama 250 fireman

Cadet
Joined
Jun 12, 2009
Messages
14
Re: yamaha 250 TXRX not warming up correctly

Found one, $96 bucks. Getting it. Should have service manual by then too. Will check some thing out and get back to you.

Thanks alot!
 
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