Yamaha Outboard Parts
Yamaha   Yamaha Outboard Parts
 
Yamaha Outboard Forum Yamaha Outboard Parts Discussion Forum Yamaha Outboard Parts Boat Parts Yamaha Outboard Forum Outboard Motor Parts Contact Us
Yamaha Parts
  #1 (permalink)  
Old 10-27-2007
mowerman
Guest
 
Posts: n/a
Default CDI unit

Just wondering if anyone has had any trouble with or had to replace a cdi unit.

I have a 2 stroke 90hp Yamaha and had the 100hour service done today.
The mech wasnt happy with the motor at idle. Sometimes, not always, the motor seems to running on 2 cylinders at cold start.

So we went for a run off Wello this arvo. Cold start was fine and idled perfect.
Got to the end of the beacons, 2minutes run, and the mech says, turn it off and restart. Restart, runs, stops after 3 seconds. Did this 5 times untill the mech took the cover off , took the lever off the cdi and manually advanced something.

Fired up and kept on running,,, and didnt do it again. After a lot of starts.

Also, if you take 1 of the plug leads off at idle, the revs increase.

The cdi unit apparently controls everything to do with the motor.
Maybe one of the sensors is stuffed.

Has anyone had any of the above problems or had to replace the cdi unit .

Rod
Reply With Quote
  #2 (permalink)  
Old 10-27-2007
Super Moderator
 
Join Date: Dec 2009
Location: Lake Placid, Fl
Posts: 10,382
Default

I don't recall having a CDI causing engine to shut of but have had to replace CDI due to problems with timming advance in CDI.
__________________
Regards
Boats.net
Yamaha Outboard Parts
Reply With Quote
  #3 (permalink)  
Old 10-28-2007
SuB8HaVeN
Guest
 
Posts: n/a
Default

I had the same problems with my 2 stroke Yamaha 40hp 3 cylinder. The same thing where the motor would crank just fine and run for about 15 seconds, then act like it was running on 2 cylinders. You could pull the bottom plug and it wouldn't make any difference at all. I also advanced the timing a bit on that CDI box and it seemed to help.

I solved the problem by replacing the Yamaha with a 50hp Johnson and haven't had a problem since...

Last edited by SuB8HaVeN; 10-28-2007 at 09:15 PM.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


All times are GMT -4. The time now is 03:03 PM.

Outboard Parts

Other Forums
Mercury Parts
Suzuki Parts
Evinrude Parts
Johnson Parts
Honda Parts

Copyright 2000 - 2014, Outdoor Network LLC