500 Two-Stroke Tech

Hello all.
Does somebody know what is the difference between the 2 alternator versions ?
In the service information manual there only a little difference in amperage beyond 4000 rpm : 15A in 1GE but nearly 16A in 47X.
It's not a noticeable difference.
But it's likely that one can't mix stator and rotor because of mechanical differences.

BTW, you can mix any type of CDI with any alternator version (with stator+rotor of same type).
The 47X CDI has a ignition curve that dramatically falls down beyond 9000 rpm.
Yamaha certainly wanted to limit the risk of breakage due to high revs !
The 1GE CDI has a better ignition advance.
I changed my 47X CDI in the 1990s due to failure, replaced by a 1GE type at the time but didn't notice the different spec.
In these years it was a pre-Internet world...., it's only some months ago that I noticed the different version....

Hi,

There is a lot of talk about the ignition curve on the 47X being restrictive - my 1984 47X has always revved well past 10,000rpm with no problem so I'm not sure what the effect of the retarded ignition curve actually is.

Cheers
Paul

rd84 wrote:Hi,

There is a lot of talk about the ignition curve on the 47X being restrictive - my 1984 47X has always revved well past 10,000rpm with no problem so I'm not sure what the effect of the retarded ignition curve actually is.

Cheers
Paul

That's just a fact, the advance curve is different beyond 9000. But that doesn't mean that you can't go beyond 9000 with 47X CDI. As I mentioned, I didn't notice the difference for many years.