Nitro motors 110cc, Manual

Page: 17 / 33

17
. Remove center hole cap and top hole cap (ignition time observation hole) on left tank cover of engine, as shown in Fig.17.
. Remove 2 valve caps from cylinder head.
Insert T- wrench into center hole cap, clamp on the fly wheel nut, clockwise rota
te fly wheel till alignment of the “T” mark with the mark on top hole of tank cover
and slightly shake the rocking arm. Loosing of rocking arm (gap) denotes that the piston is at upper dead center of compression stroke and the valve may be
adjusted. Tightening of rocking arm denotes that the piston is at lower dead center of exhaust stroke. At that time, T-wrench shall be clockwise rotated for 360°, to
align the marks and then the valve may be adjusted.
. For checking valve clearance, insert the feeler gauge between the valve adjustment screw and valve ram (Shown in Fig.18)
.Standard valve clearance: suction valve 0.05mm, exhaust valve 0.05mm.
. For adjustment, unscrew the set nut of the adjustment screw, and regulate the screw till feeling slight resistance when inserting feeler gauge of specified
thickness. After adjustment, tighten the set nut and re-confirm conformity of the gap.
. After adjustment, re-place valve cap and two hole caps on left tank cover.
.Re-fit other disassembled parts.
-Fig. 17- -Fig. 18-
4.4 Carburetor idle adjustment
Place the car on flat road, start the engine for pre-heating and after rise of temperature make adjustment (idle screw shown in Fig.19)