I agree with DSLBNZ, the 617 is fine at 70 mph. Joe P, I don't think you drove it enough @70 mph. My typical cruising speed on the highway is just under 80. I think that is a sweet spot.

__________________
'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R