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My z50 speedometer was off between 5-10mph until I GPS it.
It does 60 mph with exhaust, mikuni 22 carb & a 17/29 gearing.
There's a guy with an 88cc engine who does 60mph but at 10500 rpms on a z50
Not to say your not going that fast as every bike is different.
Either way that's pretty quick.
I need to check my plug after a wide open run in 4th gear to see if I'm still lean.
Also did you change the oil before you rode it?
If not change it before you ride again as that factory oil is poopoo
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