The bike should do 70 as long as there is no wind or uphill grade. A strong headwind will normally affect your speed by at least 10mph or more depending on how strong it is. The GZ is a little light on power. Your weight can also be a factor (no insult intended). GZED is right on checking the valves for starters. Don't know that seafoam would be necessary that often unless your fuel supplier's tanks are contaminated. I have yet to need valve adjustment or seafoam for the carb, but I have an '09' GZ with only 15,000 miles on it. I am sure others will come online to give you some other suggestions to check that are better mechanics than I am.
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