Am I doing something wrong? -- Top speed

Reed Hois /
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Ok my 78 Magnum XK is modified like crazy. My goal is to cruze at 40 mph (not risking any bearings or wear). With that, I would assume the top speed should be about 50-55. Currently does 47ish, which i cant complain about, but it has 18x40 gearing, which seems to me, according to forums, is very fast. The takeoff is really damn good, I'm not complaining about the acceleration at all. SO ... what steps should I take... even smaller rear sprocket? Carb tuning? Timing? (BTW the timing seems pretty damn good but im no expert)

Spec list:

E50

Stuffy race crank

Treats CDI

Treats kit 70cc

Hi Comp head

21mm OKO

Techno Bullet exhaust

MLM intake

Thanks!

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