Yam Ft9.9 Igntion

[DHPMARINE]

I'm having trouble diagnosing an ignition problem on a 1988 Yamaha 9.9. It's a FT9.9ELG.4 stroke.

Sometimes it will run fine,but sooner or later it acts up.It is the same as if I were hitting the kill button rythmically.Just like pressing it in and releasing it over and over again.

First guess was the CDI,but the new one does the same thing.

I found the coils and magnets lightly coated with rust,cleaned them up,same thing.

I'm looking towards a new Pulser Coil,but really don't know how to test it. (I know the factory manual will be suggested,but we can't buy the manual
for ever motor traded in here).

Any Ideas ?

DHP

 

[bgbass.1]

Re: Yam Ft9.9 Igntion

I had one doing the same thing it was getting hot but not hot enough to trigger the alarm ended up being thermostat

 

[DHPMARINE]

Re: Yam Ft9.9 Igntion

that's a thought,but this one is running at OK temp.Thanks.

DHP

 

[DHPMARINE]

Re: Yam Ft9.9 Igntion

Anyone else ?

DHP

 

[sdsaw]

Re: Yam Ft9.9 Igntion

This may be a long shot, but try changing your oil and make sure the oil filter is clean.
My 9.8's oil tank corroded thru and dirtied up the oil causing it to lose oil pressure and then the timing will retard (safety feature) causing the motor to run real poorly.

Scott