DR 5.8 HP Operations Instructions download pdf (Page 16)

16 DR

5.8 HP ENGINE

2. INSUFFICIENT ENGINE POWER OUTPUT:

TROUBLE CAUSE REMEDY

When increasing throttle, speed increases

slow or speed decrease and engine stops

running

Fuel supply system

Air in fuel line or fuel line clo

Exhaust air or dred

e fuel line

Main oil flow hole is not ad

usted

erl

Read

ust

In carburetor, needle valve hole and main oil flow

e c

ogged.

Clean and blow to get through

Fuel shutoff is clo

ed u

. Clean

lace dama

art

Too much carbon deposit in combusting chamber. Clear away

Too much carbon fouling in muffler and exhaust

pipe.

Clear away

Air filte

is clo

ed u

. Clean air filter

element

Intake

e is leakin

air or re

lace

Poor

compression

Piston or c

linder or

iston rin

is worn

lace worn

arts

Air leakage from the surface where the cylinder block

contacts the c

linder head.

Replace cylinder gasket

Too big or too small valve clearance. Readjust

Valve tightness is poor. Repair

3. ENGINE NOT RUNNING SMOOTHLY:

TROUBLE CAUSE REMEDY

Knocking sound

Piston, cylinder or piston ring is worn excessively. Replace worn parts

Piston pin and piston pin hole are worn excessively. Replace piston or piston pin

Tie rod small head is worn excessivel

lace tie rod

Roller bearing for crankshaft main shaft is worn. Replace roller bearing

Abnormal

combustion

Engine is too hot Troubleshoot reasons for hot engine

Too much carbon deposit in combustion chamber Clear away

Improper gasoline brand or low gasoline quality Replace with qualified gasoline

Spark

lacking

There is water in float chambe

Clean

improper spark plug electrodes clearance Adjust

Something wrong with induced coil or related parts Check and replace damaged parts

 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.

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DR 5.8 HP Operations Instructions Page 16

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