Finally got it done.Use a 10mm reversible ratchet wrench.Work from right side to remove left side horn and vice versa.Ironically, I want to do the same thing, and replace my stock horns with a trucker horn. I had one on my FZ1 before I sold it, and WOW was it louder than hell. Pep boys has one for like $30 I think right now, and it's compact, like the size of 2 cells put side by side. The pain in the neck I'm trying to figure out is how do you get at the stock horns to remove them, and if you have to take off all the cowls and fenders and all that.
I feel your pain!
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