Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 116Get this manual

Inspection 1Inspect needle and pi ston valveReplace if worn or damaged

bFloat Pin

aNeedle ValvePiston Valve

6Remove plug, pilot jet, and main jet
2Measure electrothermal valve Replace if out of specification

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives