Start hunting then, go find the spacers and next time keep them on the axle.
Your bucket's chamber design looks very similar to my Ol' DT175 chamber. It seems to peak quite low in the rev range (Correct me if im wrong).
So i doubt your get some real top end by changing the jet's.
Best bet would to make a new chamber if you have the tools.
I would also suggest fixing the carb spring/throttle cable, its not really that dangerous atm, but it's probabaly a quick fix and will let you have more control over you throttle input's and more feel (I couldn't feel when i was at full or not).
Other than that cool bike!
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