You could try Adventures own site they have some pdf's although not the one for the solo 210 engine.
I ended up downloading the freshbreese pdf for their solo engined machine instead it gives me the settings and info about the engine I need.
They are good reliable units as long as they have the high energy ignition.
weak point is the cage and when it goes invariabley the prop does as well.
The cage for the Nirvana range of units is almost a straight swap with a huge improvement in material strength that gives a very solid cage that can take a bump or two without turning into crumpled up tent poles.
Well worth doing.
Anyway enjoy and welcome to the forum