Ignition Coils

[almetelo]

Hi!

Anyone can give an idea of diference between a F6T509 and a F6T530 ignition coil.

[boscoe99]

What model motor are these coils used on?

[almetelo]

the F6T509 are used on my 30 2strk x3 (seems to be also used on other models of 40 and 50 hp) and F6T530 are used on 40 and 50 2 stroke and many others including Suzuki, Tohatsu, Mercury etc at wide HP range

The F6T530 will work intead of F6T509?
What would be the diference?

[boscoe99]

I can't say what the differences are. A coil as you know is a pretty simple device. But, they can have different windings, internal resistances and so on and so forth.

If they are of the same configuration they may have different output voltages. Or, one may simply be an updated version of the other. F6T530 seems to be the manufacturers part number. Yamaha then assigns its own part number and won't let anyone know from where they get it.

A Google search indicates that these are not the same coils. Different mounting configurations at a minimum.

1989 Yamaha 40 HP Etlf Outboard Ignition Coil F6T509 Free Shipping | eBay

https://www.google.com/search?q=F6T5...tr%3B400%3B300

[almetelo]

Hi Boscoe!

Thanks for prompt reply.

I have both, F6T509 from my 30 and F6T530 from a seized Tohatsu 40 I bought for parts.

I know some guys use the F6T530 on yammy's 25/30x3 and I wish to know what diference would make if any...

[boscoe99]

You can determine the resistance of each coil, both primary and secondary sides, using an ohm meter. That will tell you if they are similar in this regard.

You could then apply a low AC voltage to the primary side of each coil while measuring the output AC voltage from the secondary side. Maybe the number of coils is the same for each. In which case they would both have the same output voltage. Be careful doing this however as we want you to remain around to help Yamaha folks in need.

For low AC voltage I would use what are sometimes called wall warts. 110 AC to 6/9/12 DC volt transformers. You will have to pry the case open to gain access to the low voltage coil however. Then tap into it before the AC is converted to DC by the rectifier. Folks over here have them handy because most all electrical stuff comes with one and when the electrical device craps out we throw it away but keep the transformers. Maybe start with one that has a very low voltage because even 3 or 4 volts stepped up to many hundreds of volts can hurt you.

Or, just install the different coil on your motor and see how it runs.

[almetelo]

I also collect that transformers and have a box with lot of these stuff, will check voltages of these wall transformers I have and decide what to do later.

If doesn´t make clear I can always run with it and check if I can notice any diference ( I doubt)

Have a friend with a 50 2 stroke running with a coil diferent from the other 2 and no issues/troubles

Thanks

[99yam40]

If the mounting is different , that could be a problem.

[almetelo]

since F6T530 just have one bore should no be a problem but use the F6T509 on a suport/block just have one for 2 bores in the coils shoud require some work to ground both bores.

Thanks