Hi,
I would replace the bearings while your in there, and that circlip will need replacing, as to the balance shaft it should be as shown in your picture, but you will need to align the gears to refit, just use a small nail in the holes and align the gear teeth this will make it easy to fit back without causing damage. You say the gear shaft snapped so i would check every bearing in the gearbox and make sure there's no metal fragments in there. I'm currently rebuilding my dommie engine with rebuilt crank and rebore and replacing anything i don't like the look of. The dommie engine is easy to rebuild but you might as well do it once rather than putting it back together and then finding something you should have replaced causing problems and having to do it again. Good luck on your trip!
Teedee
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