thanks for the replies. The general consensus is that this is not a good spot to 4 bet light.
I did 4 bet all in though and it got through adding about 25% to my stack. My thinking was that the SB thought I"d steal light given that the BB was a sit out. I thought he could easily 3 bet light here. As george said, the stacks do fit here and the SB had left himself plenty behind to fold to a 4 bet. Coupled with the fact that I had hardly played a hand (was I getting bored?) I thought that the SB would fold a lot of better hands here and would think he was dealing with QQ+ or AK.
It was quite a big buy in for me as well (22 euro) and a lot of the deadwood had gone by then, so I thought most players left would be able to lay down to a 4 bet there....In hindsight, I can see that I would need a stronger read to do this again (I didn"t try it again!!) and a stronger hand if I did it for all my chips.
I just remember thinking at the time "this is crazy" and just because it worked this time, wanted to know if it was a profitable play in the long run. I was definitely influenced by the sit out BB and would not have tried this if he had not been sat out.
I did manage to FT this tourney which was pleasing ( came 10th though
)
thanks again for your thoughts. Any others are of course appreciated