The Bearing Mod carburettor has been custom modified to accept high quality, stainless steel sealed bearings on either side of the throttle shaft to help support and seal this area from debris ingress and air leaks.
When dust or sand enters the shaft bore area on an unmodified carburettor it causes excessive wear on both the shaft and the internal bore of the carburettor body. When unmetered air enters the engine via the worn shaft, it leads to a lean condition, which then causes an engine failure.
This modification stops 99% of dust and sand from entering the carburettor bore and the engine, thus making it more reliable and saving you from an expensive engine rebuild.
The WT-990 carburettor is recommended by Zenoah for upgrading your RC-style engines. Engines with the standard carburettor (WT-603, WT-668, etc) tend to experience a lag in low-end acceleration when tuned for peak power.
- Walbro WT-990
- 15.88mm bore
- 12.7mm venturi
- Independent tune-able high and low speed jets
This carburettor does not have an internal choke.