Its funny how I just crit'd another bike event (MX) but whereas I had a moan about cutting off bits of the bike, in the first image, it doesn't matter so much because you've got his eyes in the image (the look of determination and concentration) whereas in the 4th image, cutting the bike front wheel off a little and most of the rear end, does spoil that one for me because there's nothing to look at much, i.e. no face showing so that image doesn't do anything for me, sorry!
The 2nd image, Im not sure about at all. If the lady was talking to a biker with his helmet under his arms or something that made me think its motorcycle related, I would like the image more, but as it is, its just a lady with her mouth open (are there any photos of women with their moves closed - no, the shutterspeed cant go fast enough to capture that bit hahahaha). i.e. if you posted that image on its own, we wouldn't have a clue what the image represented. I dont mean that to sound horrible - (and apologies ladies, I couldn't resist)
Image 3, I want to see more of the bike, either get in closer so we can see the exhaust or further out so we can see the whole thing. I know some git was in the way, I can see their arm in the foreground so maybe wait until the opportunity arises for you to get a better image.
Apologies for the negativity, I did spend a fair bit of time analysing these to give you some fair critique and it is of course, just my opinion, which mean's nothing.