by Arkie » Sun Aug 28, 2022 11:14 am
Yep, Zama plus other have started the no kit available thing, but you can USUALLY find a kit if you have a part number, but when flogging one recently I could buy a clone carb and get a tune up kit with spark plug, fuel filter, tygon tubing, air filter, and primer bulb for less than I could get and install a kit. (around $15 with free shipping in USA) I seen a Zama carb cross reference to kit and parts on-line awhile back that was good for getting the correct kit cross reference. The NLA available kit thing for carb kits is going to cause the price of kits to be jacked up soon or not available.
Both of them plugs you mentioned I suspect should allow it to rev up. (the 6 and 8 as I've used both with good results, but I do not trust any Champion small engine sprak plugs, especially the J6 and J8 areas)
I'm little concerned about the straight gas you mentioned. I would probably see if I could get the muffler off to take a peek at the side of the piston before getting any parts or spending any more time. (might be whipping on a dying horse)
I had a Poulan Pole Pruner/trimmer with a Zama that was acting similar to your described issue awhile back also and first found the fuel filter off in the gas tank so I pulled the pump side plate of the little Zama and give it a cleaning, cleaned the filter and installed new fuel line and it took off. Was starving for fuel, idled good but the H jet would not adjust.
I did not have to pull the metering side of the carb due to finding debris on the pump side.
Carb was easy to get off/on in case I needed to go back to the metering side was another reason I did not disturb the metering diaphragm side.