Walbro WT-990 high-performance carburettor.
This is the carburettor recommended by Zenoah for upgrading your RC-style engine.
Engines with the standard carburettor (WT-603, WT-668, etc) tend to experience a lag in low-end acceleration when tuned for peak power.
Bore: 15.88mm bore
Independent tune-able high and low speed jets.
This carburettor does not have an internal choke.
Note: This carburettor now comes standard with modified throttle shaft, so it will work perfectly in most R/C applications such as HPI Baja, FG Modellsport, etc.
The WT-990 carburettor is the same as the WT-813 WITHOUT an internal acceleration pump.