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Tohatsu 30 hp 4 stroke runs rough at slow speed

dan_g

New member
"Tohatsu 30 hp 4 stroke runs a

"Tohatsu 30 hp 4 stroke runs a little rough when idling and at low speed, makes chugging or chuffing noise and sounds like it might be missing on one cylinder, but accelerates well and seems to run smoothly at medium or full throttle. Shifting is not smooth at low speed because of this: Engine wants to stall when shifted into gear at low speed, probably because one cylinder may not be firing. Suspect carbs, not ignition."
 
You have two choices: You can

You have two choices: You can either test all the ignition system parts and by doing so eliminate that system as suspect or you can clean the carbs first as that is where 90% of all problems lie.
 
Is there any easy way to tell

Is there any easy way to tell which carb is the problem? Are the low-speed jets easily accessible?
 
"You can carefully pull the sp

"You can carefully pull the spark plug wire off of each cylinder, while the engine is running, to see if one cylinder is dead."
 
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