Re: Yamaha CDI Unit failures

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Re: Yamaha CDI Unit failures

Posted by jack coulter on July 21, 2003 at 13:02:00:
In Reply to: Yamaha CDI Unit failures posted by Roger Ford - Kokomo on July 15,
2003 at 04:46:00:

Hi Roger: Check the stater plate(under the flywheel). I've replaced both of mine
on my 9.9s (450 hours). Same symptoms, turns over strong, very weak spark but
won't start. My flywheels were very rusted underneath. Easy to install once you
get the flywheel broken loose, don't drop the flywheel key out of the slot. Unit
wholesale are $185 each. Best/ Jack/ "MOJO" 36078

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Re: Yamaha CDI Unit failures

Posted by Bob Johnson on July 15, 2003 at 09:24:00:
In Reply to: Yamaha CDI Unit failures posted by Roger Ford - Kokomo on July 15,
2003 at 04:46:00:

According to my Clymer manual all you need do is disconnect the wires and
unbolt.All leads are color coded and have male or female connectors to help
identify them.

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Re: Yamaha CDI Unit failures Chet White 17:47:14 07/21/03 (0)
Re: Yamaha CDI Unit failures Chet White 17:31:48 07/21/03 (0)
Re: Yamaha CDI Unit failures Chris Randolph 11:28:50 07/21/03 (2)

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Re: Yamaha CDI Unit failures

Posted by Chet White on July 21, 2003 at 17:47:00:
In Reply to: Re: Yamaha CDI Unit failures posted by Chris Randolph on July 21,
2003 at 11:28:00:

Hi Chris,
CDI stands for Capactive Discharge Ignition. It is the black box located behind
the wire loom and cover on the port side of the engine. It receives input from
the pulse coil and spark coils (2) located under the flywheel. The spark coils
are mounted on the stator plate along with the charging coils

It then sends electrical pulses to the hi-voltage coil which fires both plugs
simultaneously, one at top of compression and one at top of exhaust stroke

Both the CDI and Stator are common culprits for no spark in the T9.9

If you are having starting (cranking) problems check A)the 10A fuse at the top
of the wire loom, B)the start solenoid located near the fuel connector, C)The
neutral switch buried under the carb, D) The starter itself

I have found good prices at http://www.boattune.com located in Orlando,Fl
Hope all this helps,
Chet
AlleZcat 36010

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Re: Yamaha CDI Unit failures

Posted by Chet White on July 21, 2003 at 17:31:00:
In Reply to: Re: Yamaha CDI Unit failures posted by Chris Randolph on July 21,
2003 at 11:28:00:

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Re: Yamaha CDI Unit failures

Posted by Chris Randolph on July 21, 2003 at 11:28:00:
In Reply to: Re: Yamaha CDI Unit failures posted by Bob Johnson on July 15, 2003
at 09:24:00:

I have the exact same problem with one of my 3-year-old 9.9s. I haven't
investigated it yet (resorted to pull-starting until I had time). What is the
CDI? Is is part of the starter? I apologize for my ignorance, but have never
worked on outboards before. Any additional information (including parts sources)
would be appreciated

Chris Randolph