Well they certainly did, must have been their first odd fire twin engine... The 130TD had dual carbs with the spit fence between the two carbs... was a menace inside the J3 cowling, I ended up extending the spit fence back to the firewall and up to the inside top of the cowl to stop each cylinder from ingesting the others standoff.... Clarence didn't go into to much detail with his review on the 80T.

Ign timing can be advanced when run on glow fuel, I run the boxer 34-36 degrees, but when you do that with the stock ign, you advance the idle timing as well... on gasoline with that compression ratio, you'll have to retard it some, around 28 degrees.

What oil content are you running?... what propeller?