I have never adjusted the low jet on any of my 15mm pumper carbs, they all work good, the high jet I run at 2 turns out. Have you adjusted the idle screw on top of the carb?? It helps alot if you crack the throttle a hair when starting. The piston hole closes when the throttle is off, and its hard for it to get air. Sound more like your not getting gas up the main jet tube in the carb bore, or your not gettin enough air thru the carb. That's one of the reasons I put and 813 Walbro cause it has an accell pump like a car carb, when you step on the throttle it squirts gas into the carb bore.
When my 4 stroke X18 runs only with the choke on, it's cause the pilot jet is clogged, but your carb don't have one.
The dripping oil get used to it, there's gas in the oil and it burns, and some gets left in the pipe,lol.
When my 4 stroke X18 runs only with the choke on, it's cause the pilot jet is clogged, but your carb don't have one.
The dripping oil get used to it, there's gas in the oil and it burns, and some gets left in the pipe,lol.