Gx160 and gx390 question...

#1
Bought this minibike with a gx160 on it. Will my gx390 bolt right onto it?
i have a 36mm keihin carb on the side, is that too big for the gx390?
where can i get jets for that carb?
Where can i get an intake manifold and spigot for the gx390?
What clutch could i use? Im just gna use it to ride around but need the response when i open her up.
 
#3
a GX390 has a much larger mounting pattern than a GX160 so it will not just bolt in. another thing to remember is that the GX390 has a 1" shaft and clutches for them are not cheap ($100+).
 
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