1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 49Get this manual
9 Wilh engine in neutral, move throttle lever 10 place maxi mum spark advance screw against stopCrank engine with slarler mol or and adjust maximum spark advance screw (Figure 6) 10 align 22 mark on flywheel with timing pointerDu to the spark advance chara cteri stics of thi ignition system, this adjustm ent will resul in spark ad'ance of 20 I3TDC at 5500 HPM 10With engine not running, move throul lever to ",'ide opent hroule (WOT) and adjust fu ll throttle stop screw (Figure 7) to allow full throttle opening at VOTMake sure that throttle shutters do not act as throllle stopMlow .0 10" 015" (0.2Smm 10 .38tn m) clearance be tweell roller and thrott le cam at VOT, as shown in Figure 7Retighten nut on adjustment screwIIRei nstall sou nd box cover to engine and fas ten fuel line co nnector to sound box
12Adjust engine idle RPMas follow5:
ACAUTION
Engine Idle RPM must NEVER exceed 750 RPM in gearaWith eugine in wat er, con nect electrical harness and fuel line to engineSlart engi ne and all ow to warm upa Full Throttle Sl OP Screw Push Throttle Linkage Downward.0tO, to .OI5 (O.25mm 10 .38mm) Clearance