walbro wy carburetor
Anybody familiar with the Walbro WY carb?
This one is used on a Tanaka TCB-160 weedeater. I've got symptoms of lean mixture or starvation but can't seem to find cause.
Fuel flow from tank the carb is OK and I replaced fuel hose. Fuel pickup in tank is OK and flows well. On disassembly, inlet diaphragm and valve are OK, as is inlet screen. Pumping flapper valves are also OK and main jet which is fixed design is also clear.
Carb does not have idle and main mixture screws that I am familiar with on other Walbro's and Zama's. Also has a cam arrangement which lifts the throttle bore and would appear to raise a needle in the main jet. There is an adjustment on top of throttle, but I'm not sure how it works.
I'd appreciate any insight from someone familiar with this particular carb. Spare me general advise such as "spider in the fuel cap", etc. However would appreciate information specific to this Walbro.