Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
The F1/K carbs and F2 carbs are completely different, even the fitment is different. There is a way somewhere on the internet where you can swap F2 for K carbs but have never seen anything about the reverse. Put simply they don't fit.
Plus the F2 has the godawful pd carbs that are an utter nightmare.DO NOT fit new jets just ultrasonic all the old stuff, aftermarket brass is not always accurate
Your F2 had F1 carbs cos the F2 PD type are abysmal