This is the 21J3-1 Slide Valve Carburetor for the|
21XR-B Version II 1/8 scale Buggy Engine, OSMG2056.
Replaces worn or damaged carburetors
Assembled 21J3-1 Slide Valve Carburetor with Carburetor to Crankcase
O-Ring, key #5
Carburetor Settings, NOTE carburetor is preset at factory and
requires very small adjustments
Needle Valve: Run vehicle with throttle fully open a few times over
long straight course to observe vehicle speed. Close needle valve
15° and repeat run. Gradually close needle valve in subsequent
runs to achieve highest speed taking care not to close needle
valve too far and overheat engine.
Metering Needle: With engine running, close throttle and allow
engine to idle for about 5 seconds then fully reopen throttle.
Turn metering needle clockwise 15-30° to lean mixture if
excessive smoke is observed, or counterclockwise 15-30° to
richen mixture if engine speeds up momentarily and then cuts out
Does not include Reducers, order OSMG2498 for the 7mm Yellow Reducer,
or OSMG2471 for the 8mm Red Reducer.