2-14 ENGINE TUNE-UP - Fast Idle, Throttl e Posit ioner FAST IDLE Fig. 2-48 1. Pull th e choke bu tt on f ully . 2. Open chok e valve w it h a screwd river and start the engine. ~ Fig. 2-49 tJP3 3. Set to the specified rpm by tu rning the fast idle adjusting screw. Fast idle speed 1800 rpm Fig. 2-50 1. Warm up the engine and check th e idle ~ speed. THROTTLE POSITIONER Fig. 2-51 Disconnect the TP diaphragm hose. Open th r ott le valve slightly and re lease it ~ ~ : TP adjusting screw shou ld hoo k on to the throttle valve lever. I ~