Is the F4i lower fork compatible with 919 upper fork?

[thundertusk]

I'm wondering if the lower section of the f4i fork with fit and go together with the 919 upper section?

[Pvster]

hello and welcome! The short answer is no because the internals of the lowers are different. Mcromo can give you a fully detailed answer.

what you can do is install f4 or f4i forks as everything will bolt right up. You'll then need to relating as the f4/f4i forks are super mush.

feel free to ask questions and search since you've come to the right place! Tons of info here.

[thundertusk]

I know the lowers are different but uppers look same. I have both sets of front ends just f4i uppers look worse for wear and not sure the uppers are salvagiable. My 919s is in great shape.

[Pvster]

thundertusk, if the f4i uppers are pitted, you can try to buff them out or take the forks apart and take the tubes in to be sandblasted and renickled/chromed (whatever you prefer) or buy a new pair of uppers to replace them.

here is the thread regarding the f4i lowers. it's been tried and tested to no avail.
planning a F4i fork swap.