Hi Neal,
I am not real familar witht he 400, I did have a 650 so I thought I would have a stab at the problem.
It looks to me that the gearing you have is wrong, 5000 rpm at 60 kph is about 12 KPH per 1000rpm and you shoud be nearer 18 KPH per 1000 rpm. I think the peak power is around 6500 rpm. At 5000 rpm you should be pulling around 90 kph.
The ratio you are running now 15 / 40 is 2.66 to 1.
1 tooth less is 2.86 to 1 about 7 % increase, 64.2KPH at 5000 rpm
Can you find out what the standard sprockets should be?
I maybe completly wrong about this.
Steve
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