Glad you got it running. My '86 V4 did the same, lazy starting, it was the negative cable that burnt out. If you check the length of the cables you should find a hard lump which you can't flex or is crunchy!!
On another point, my motor is old and a bit tatty but it still works, and works well! I spoke to a Suzuki salesman at southampton about replacing it with a newer one and he thought I was mad, He'd rather spend the money on fuel in my V4. I haven't looked at another engine since!!
But if I did have the money......