Running rough

Small Engine Running Rough: Fuel or Jetting?

Separate old-fuel symptoms from carb setup changes before you chase jets on a trimmer, blower, saw, or small engine.

When to check jetting

Rough idle

Starts then stalls

Only runs with choke

Field rule

Old ethanol fuel and dirty carbs are common first checks.

Jetting changes make sense after fuel and air filter basics are known good.

Jetting guides

MixMate by SGN Technology

fuelmixmate.com