I am no expert but I gotta respond.

You say that "the piece that is moved by the throttle servo and determines the amount of air to the carb has fallen out a number of times. It seems to just be held in with a small gasket". Moki has a name for it, I think the exploded view calls that the "drawbar" and we call it something else. Like throttle barrel. I included (I hope) an image with this post.

The Drawbar is held in place by a bolt and cap nut that screws into the carb's body. The bolt goes/sets into the black groove you see in the attached image.

It could be that the black rubber O-rings have worn themselves to the point that they no longer provide a good seal. They are found in the Low Speed Disk. Just pull it out.

Also, my Moki has a "99" stamped on the exhaust side engine mounting lug, and I bought my 1.35 in 2000. I don't know if the "99" means the year of manufacture. What does yours have stamped on it?

My engine turns an APC 16X8, has large fuel tubing from clunk to carb inlet nipple, no fuel filter, 16 ounce tank, Bisson Pitts Style muffler with the 1 exhaust tube, OS F 4 stroke plug, and running on 5% PowerMaster fuel. What have you got? Don't leave any info out.

I think that I sill have the original instructions from Gerard Enterprises that include break-in procedure. If you need a copy, I don't think that Mr. Gerard would mind.

The Low Speed Disk does not require much movement. It should be about 3-5 notches to the right of the marking. Get the High Speed needle valve taken care of first. Hopefully, your tank is centered to the center of the needle valve or no lower than 3/8".

Also, I hope that all the bolts are tightened. It's got a lotta bolts, don't it?

Let me know how it does.

SA Flyer