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I’m still ‘cutting my teeth’ on the ‘newer’ 20-25-28-30-35’s, but so far, they aren’t all that complicated, and aren’t all that dissimilar to their predecessors the 18-20-25’s in terms of personalities/set up. If anything, they remind me a lot in terms of design of the 9.9/15hp motors.
I have observed that they generally run their low-speed mixtures at 3/4 to 1 & 1/4 turns out. If you’re running it in a barrel, it probably needs to be run a little richer because the motor won’t breath as well, it also may not idle down as low (at least this is the trend I’m seeing in my 275 gallon tote, I use a fan too to minimize ingestion of exhaust gases both personally and by the motor!).
If it won’t idle down low, you have a fuel system issue, likely the carb needs a going-through, or the usual stuff (check compression…should be 135+ on my gauge…a nice one will run up to 180 PSI when all oiled up..maybe even north of that!). Agree with what everyone else has to say about using the key to give the motor some burps of fuel when first started.
But usually after a minute, it should run fine with a wide open choke.
A late 80’s model has a nice priming system configuration so it should start pretty easily…I mean, fuel into the carb throat, manifold, and cylinders…it would take a seriously low-performing ignition NOT to ignite that much fuel in the air!
A lot of extra mini-fuel lines to save people 2-3 extra pulls on the manual starter…