Don't know what cogs are on it - though I keep meaning to check as I got some spare ones with the bike.

180kph ~ 11,000 rpm.

At the moment it is doing almost exactly 10mph / 1,000rpm. ie. In 6th gear 112 kph on the speedo = 7,000rpm = 70 mph. I quite like it though like that as then I just read the tacho for speed in top gear - 7,000rpm = 70mph .

I thought if it was restricted then it would stop pulling at a given speed - 112.5mph or 180 kph ?

As mine keeps going I thought it wasn't restrcited.