Does anyone have the standard air cleaner for a A12 engine which they would like to sell? Or is there an after market item that would fit the standard Hitachi carb? Seems the lip around the top of the carb is very thin which would make it very hard to attach a air cleaner to it......Thanks

If its in a 1000, you'll need a 1000 airbox! The later ones foul on the bonnet! I had a neato little filter that held on by a hose clamp off a holden red motor. But that was sold with the ratwagon. Maybe measure the diameter and go search for something at a parts shop

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You say it's for an A12 engine, but don't confirm that it's for an A12 carb.
The carb that was used on the 1200 & all the later downdraught Hutachi's that came on A series engines used a center stud to secure the air filter housing to the carb.
The 1000 caeb, .. however, used a paralell section that projected upward from the air horn & the filter sat over this with a rubber insert to allow sealing.

The whole thing was secured to the carb by a clamp with a long screw that protruded out far enough under the main body to be turned with the fingers via the loop formed in the end.

From your description you have provided, it sounds to me like the 1000 carb.

Grab some carby cleaner from an autoparts store & spray the outside of the carb untill you can find the carb model number. This usually looks to be printed on the main body & can be very faint at times, usually the fuel bowl & will look something like DCG286 [1000] or DCG306 [1200] Other models of this engine, including the 1000 coupe, used different versions of these carbs, but all had similar model numbers.

If you can get that number, we can identify the carb & if it's a 1000 item, then I suggest that you source a newer one as stock air filter housings & aftermarket 'sports' types for the center stud type will be MUCH easier to obtain.

If you do have a center stud type, then have a look at the top. Is the stud broken off in the center,[get it out] or is the thread stripped? [helicoil it]