Tohatsu 9.8 2 Stroke sparks different

[WolfmanAndy]

The tohatsu 9.8 2 stroke seems to only run one one cylinder. I have cleaned the carburettor and put in new plugs. I get a strong blue spark on the lower cylinder but a weak yellow spark on the upper cylinder. Could the HT bottle be faulty, or a suppressor cap, or what?

 

[racerone]

??-------How old is this motor ?---------Swap the ignition coils around and report the results of your spark test.

 

[tommarvin]

CDIelectronics.com is the king of ignition parts. They have troubleshooting and testing, below each part ,scroll down.

Free factory service manuals at www boatinfo.no/lib/library.html click your make,find your motor,find your part.

 

[pvanv]

The M9.8B has a combination CD and siamese coil. You could have a bad plug wire or connector, or rarely, and bad CD/coil.

 

[Sea Rider]

Internal plug's cap contacts must be in shinny looking state, replace if ain't so, once rusted are hard to clean to immaculate cond. OTOH, you could have already one of the internal siamese coils with electric issues.

Happy Boating