A few weeks ago I hit 65mph for a second and was pretty excited. Indicated speed, stock gearing. Last week I noticed I could hit 65 consistently and actually hold it there. Today riding home, I touched 67mph before settling back to 66mph and holding there! I commute 23 miles a day (11.5 each way) and half of that is WOT going dead arrow straight. I think all the WOT runs are making my Grom faster.
Also, a few weeks ago I was running 91 octane out of habit. Last week I ran 89 octane and hit 65 consistently, so this week I ran 87 octane and hit my fastest top speed ever.
I was going so fast today I had a guy chase me down because he said he couldn't believe that little bike was doing 65mph haha. He wanted to know what it was so he could get one :D
Anyways, totally stoked! Never thought I'd get those speeds on a stock Grom. Only performance mods I have are full exhaust and minor airbox mods.
Also I'm 6'3" and 235lbs, and still hitting those speeds!