Axotopia
ArboristSite Member
Idle screw you circled was set all the way in initially, but would not open throttle valve enough for engine to idle. I had to add a plastic tubing to open the valve a little more to idle.
The L needle is exactly what Lone Wolf stated.
It feels like the Farmertec carb may pumping so much fuel that cutting the fuel completely with the L needle fully seated had no effect. This may also explain why I had to open the throttle valve much more to get it to idle, probably needed more air balance the air-fuel ratio.
The exhaust port seems to be very wet every time I run it. So there's probably a lot of unburnt fuel. Piston looks very wet as well; no scoring on exhaust and intake side.
Planning to do 3 things over the next weeks.
1. Try another vac test as Lone Wolf suggested. Already ran 5 tanks of gas through this, so would be interesting to see if it is still holding pressure.
2. Buy and rebuild used OEM carb from Ebay. See how it performs.
3. Fiddle with the metering needle and metering level on the Farmertec carb. Gut metering feeling metering needle/valve is not fully seated and the pump may be pressurizing the reservoir.
