Not sure
I think the magneto is the part that produces energy, am I right?
If that's so, I have indeed have some trouble with it.
I havent had big trouble, its a 1995 WR360, and the workshop told me it wasn't generating as much power as it should and so the spark plug is not being able to burn fuel properly.
I understand it was changed last year, but I dunno how many times before that.
The people at the workshop told me I have to open the carcass every now and then to let the water out that goes in when going thru rivers and stuff.
I dont think its a big deal. I rode a 1998 360cc KTM last week, and I'm glad I have my husky. It stands no chance.
Anyway, I hope this helped somehow.