Anyone know what kind of gearbox it has?
unfortunately NO..
I've seen several karts (the junior 911, the 'newer 500SL and others ) with the exact same layout..
a G120 (G140/160 sometimes) Honda with an attached gearbox ... but I cannot seem to find any information about said gearbox, who made it,
if it's actually made for the karts or taken from some industrial machinery... NOTHING!
But I have some "under the hood" pics... maybe you can find some more info with it.
it's a transaxle and IIRC a 3/4" axle, no differential and it has an internal chain (again IIRC)
other than that.. I have found no information
I had more.. but again.. migrating computers, finding my files is a real pain ATM...
[
EDIT]
Oh look.... the Lorinser is actually different!
http://www.classicdriver.com/de/car/children-s-car/engine/1985/142332
(yes.. german, but the pics are worth more than words anyways
)