Generac Power Systems R100 Operator's Manual page 16

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When testing the spark plug, never hold the high- voltage wire of the spark plug with a wet hand.
•
Make sure there is no spilled fuel outside the engine and that the spark plug isn't dipped with fuel.
•
To prevent fire, keep sparks far away from the spark plug mounting hole.
2. INSUFFICIENT ENGINE POWER OUTPUT:
TROUBLE
Air in fuel line or fuel line clogged
Main oil flow hole is not adjusted properly
In carburetor, needle valve hole and main oil flow
hole clogged.
Fuel shutoff is clogged up.
Too much carbon deposit in combusting chamber.
Too much carbon fouling in muffler and exhaust
pipe.
Air filter is clogged up.
Intake pipe is leaking
Piston or cylinder or piston ring is worn
Air leakage from the surface where the cylinder block
contacts the cylinder head.
Too big or too small valve clearance.
Valve tightness is poor.
3. ENGINE NOT RUNNING SMOOTHLY:
TROUBLE CAUSE
Piston, cylinder or piston ring is worn excessively.
Piston pin and piston pin hole are worn excessively.
Tie rod small head is worn excessively.
Roller bearing for crankshaft main shaft is worn.
Engine is too hot
Too much carbon deposit in combustion chamber
Improper gasoline brand or low gasoline quality
There is water in float chamber
improper spark plug electrodes clearance
Something wrong with induced coil or related parts
®
GENERAC
16 R100 ENGINE
CAUSE REMEDY
Exhaust air or dredge fuel line
Readjust
Clean and blow to get through
Clean, replace damaged part
Clear away
Clear away
Clean air filter paper element
Repair or replace
Replace worn parts
Replace cylinder gasket
Readjust
Repair
REMEDY
Replace worn parts
Replace piston or piston pin
Replace tie rod
Replace roller bearing
Troubleshoot reasons for hot engine
Clear away
Replace with qualified gasoline
Clean
Adjust
Check and replace damaged parts