3. INSPECTION/ADJUSTMENT Mongoose/KXR 90/50 Cylinder Head Cover VALVE CLEARANCE (Mongoose/KXR 90): Inspect and adjust valve clearance while the engine is cold (below 35). Disconnect the oil recycle tube at the cylinder head cover. Remove the four bolts and cylinder head cover. Bolts Cooling Fan Cover Screws Remove the two screws and two bolts, then remove the fan cover. Turn the cooling fan clockwise so that the "T" mark on the flywheel aligns with the index mark on the crankcase to bring the round hole on the camshaft gear facing up to the top dead center on the compression stroke. Bolts Inspect and adjust the valve clearance. Tappet Adjuster Valve Clearance: IN: 0.1mm EX: 0.1mm Loosen the lock nut and adjust by turning the adjusting nut Special Tappet adjuster E012 · Check the valve clearance again after the lock nut is tightened. Round Hole Punch Marks CARBURETOR IDLE SPEED · The engine must be warm for accurate Air Screw idle speed inspection and adjustment. Warm up the engine before this operation. Start the engine and connect a tachometer. Turn the throttle stop screw to obtain the specified idle speed. Idle Speed: (Mongoose/KXR 90): 1700100rpm (Mongoose/KXR 50): 2000100rpm When the engine misses or run erratic, Throttle Stop Screw adjust the air screw. 3-8