Yeah the fg33r3 carb will also fit directly to the ft160 manifold and will definitely be a good starting point for testing..i wont even bother with the fg21 carb ..as like you said its a tad large for the given cc,s ....
damn saito for not doing a better job of producing a decent intake system on the radthes..well i wasted some bucks on a mmm intake for the fg19r3...its simply just a larger cup inside of the manifold..does make a difference..but when the engine sits idle for a minute or more it builds up a rch mixture..sure it never dies just a bit of spluttering then it clears up well in no time..yeah saito radials sound great, little fiddling to get them running well enough to enjoy..price is fair enough too..

im trying to decide between saito fg41ts or another dreaded r3 radial..but a 60cc ..bout 500 grams between these 2 engines for my peashooter ..well a little extra weight may reduce slow flying capacity