I make gap at .028 and it's normal 10mm plug so 11-12ftlbs on torque, and it doesn't say anywhere for plug torque until back in 09 8V motor and that gives an 18ftlbs carried over from other manuals AND is wrong. Looked in Aprillia's books at 10mm plug, it said 11ftlbs
Just throwing it out there, because getting it wrong is a major PITA (not to say expense). NGK has a website here that says 9ft lbs for 10mm plugs into Alu heads, but there are lots of factors involved i'm sure and I'm not claiming any knowledge other that what's listed here
https://ngksparkplugs.com/en/resources/spark-plug-installation
Having said that I've noticed that my plugs have a tendancy in the 1400 to work their way loose if not done tight enough