Cylinder not firing-1989- 200 h.p. Yamaha

oddysea1

Petty Officer 1st Class
Joined
Sep 22, 2011
Messages
201
I have one cylinder not firing on my engine- the coil and wire was replaced and the old one did proved not to be working-Are there any other possibilities that could prevent one cylinder from not firing-all the others are.Thank you Andy
 

oddysea1

Petty Officer 1st Class
Joined
Sep 22, 2011
Messages
201
Is that a visual inspection?Would I pull the spark plug wire and place it 1 cm. from the plug and then run the engine checking for spark?Thank you Andy
 

oddysea1

Petty Officer 1st Class
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Sep 22, 2011
Messages
201
In regards to spark vs. no spark what would be the given possibilities of each scenario?Thank you Andy
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,721
Fact is that you need 4 things for that motor to run , that one cylinder to operate.----Fuel / compression / crankcase compression and spark at the right time.-----You have to figger out which is missing.-----I can not touch your motor from where I sit.
 

oddysea1

Petty Officer 1st Class
Joined
Sep 22, 2011
Messages
201
Thank you for the guidance-I do have compression-I will check for spark-the plug is clean-I will recheck for fuel burn however that clean plug is what caught my eye initially.Thank you Andy
 
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