Forgive the newbie question, but I'm headed out to a local bike salvage yard on Friday to pick up an engine for my F2.
What I'd like to know is if there's a way to tell an F2 engine from an F3 engine. I just want to know what the yard is giving me when I fork over my dough.
I'm going to ask for an F2 engine, but if all they have is an F3, I'll probably take it.

It probably won't have the carbs or air box on it, so besides that, is anything different?
Or is there a specific range of Part numbers maybe? Like 001 - 010 = F2 and 101-110 = F3?

Thanks for any help!

 

as far as ive read the f3's had a fuel pump and manual cam chain tensioner

 

Thanks!
I went and picked up the engine, they assured me it's an F2.
I sat it next to my old engine and it looks exactly the same, so I hope that's cool.

I swapped everything over & put the engine in the frame, just have to wire it all up, swap the flywheel, fasten the hoses, add fluids, etc. and hopefully I'll be starting it up tomorrow.

 

the biggest difference to note is the f2 does not have a speed sensor in the top of the block and the f3 does. other than that they are basically the same motors, the f3 has a little more compression though.