Yamaha F100AET 4 Stroke regulator CDI fire/meltdown

[Mattacraft]

So, worst nightmare really. In the Helford river in Falmouth and the motor conks out on my Ribtec. Didn't restart so I removed the hood to be welcomed with plumes of thick grey smoke. Panic stations and fire extinguishers deployed it eventually died. Looking at the damage the regulator has lit up the CDI. Now, I've had a quote for £1800 to source parts and repair. Firstly, does this seem accurate?

Secondly, I'm fairly handy with a spanner and know my way around outboards on a basic level. Is this something I can undertake myself?

The cause has been suggested that the maintenance free calcium battery has slowly fried the regulator and it was a ticking time bomb, the motor is 8 years old.

All advice and help is very much welcomed.

[phantom 19]

The rectifier is a known problem on F80/F100 and they all seem to burn out after 10 or so years, probably changed ten or so but never had one take out a CDI unit. The replacement rectifiers are a revised parts.

Dead easy rectifier and CDI are just held on with m6 bolts.

If it's any consolation the same thing seems to be happening to Suzuki DF140's

[A1an]

Originally Posted by phantom 19

If it's any consolation the same thing seems to be happening to Suzuki DF140's

ah ffs don't say that!

[spartacus]

Sorry to hear your news.

Roflhat is breaking a Yammie F100. He may sell the electrics separately.
http://www.rib.net/forum/f10/yamaha-...ing-68828.html

[Mattacraft]

Thanks all for the replies. It's only after the event that you learn of the F80/F100 woes. So, the rectifier and CDI are just plug in and play?? Does anything need setting up?

If the chap isn't willing to break these parts where would you suggest buying new from?

Thanks chaps 👍🏻

[Mattacraft]

Thanks all for the replies. It's only after the event that you learn of the F80/F100 woes. So, the rectifier and CDI are just plug in and play?? Does anything need setting up?

If the chap isn't willing to break these parts where would you suggest buying new from?

Thanks chaps

[ribber]

Past post might help

http://www.rib.net/forum/f36/diy-rec...tor-53512.html

[Mattacraft]

That's very helpful, the regulator looks a doddle. It's just the CDI I can't be sure of. More research required from me!

[ribber]

As I have F100, glad to know future problems - as mine is getting to that age.
Another post quite interesting

yamaha f100 rectifier/cdi meltdown - The Hull Truth - Boating and Fishing Forum

[Mattacraft]

Yeah, I read that! It's a b**tard really because you don't tend to find these things out until it's gone up in smoke. There's been a suggestion that it's down the maintenance free batteries but that could just be speculation... So unlucky it fried my CDI. I need to try and get this done by next week for when I'm away. It only lasted 2.5 days!......mind you it was impeccable in that time...

[Davie]

Originally Posted by spartacus

Sorry to hear your news.

Roflhat is breaking a Yammie F100. He may sell the electrics separately.
http://www.rib.net/forum/f10/yamaha-...ing-68828.html

Nae use, Fuel Injection against your carb engine. You cant even retro fit all the fuel injection parts to the carb block. HTH.

[Mattacraft]

So it looks like I'm digging deep for a new unit for £800? I guess I have to if I'm looking to repair this week.

Would you crack on yourself or throw it at the engineers and pay the £1800?

There is another part needed, I haven't identified it yet. I'll take a picture and post, see what you chaps think.

[phantom 19]

Do it yourself. 1/2hr to do it.

Other potential problems in future to look out for - leg bushing really needs changing. They corrode and can end up rotting the leg out, changed two legs on f80/100 now and that's not a cheap job.

Keep an eye out for metallic debris in gear oil - the gears may not be man enough long term to cope with torque- had a few stripped teeth now.

[Mattacraft]

I've recently done a full service. Gear changes are great, gear oil looked okay. Runs perfectly, very impressed. I'll take a look at the leg bushes. The hood is in good condition but a little faded so I'll refurb I think.

Have a look at the pic of the burnt out plug. It goes back into the loom. Suggestions for a fix?

Parts are going to cost around £1000. But needs must, it's better than £1800. Boating.

[jambo]

Originally Posted by Davie

Nae use, Fuel Injection against your carb engine. You cant even retro fit all the fuel injection parts to the carb block. HTH.

Jesus Davie I was just about to suggest he gave you a call to see if you had anything!


Sent from my iPhone using RIB Net

[Davie]

I had a merc f100 burn out loom and rectifier last week so used a Yamaha loom etc on it. I know I have another F100 it that was under
water for a day. I will see what's good on it when I get a minute.

[Mattacraft]

I've purchased a new CDI and a new RR. The guys at BHG Marine suggested I can get the plug
from an electrical type shop. What are your thoughts on that? I'm going on the hunt tomorrow. The parts are coming Wednesday and I'll get it done for Friday in time for my 10 Days in Wales!

[Superjetjim]

Count the number of pins on the plug and search online for 'Female ECU plug 32 pin' and you should find it (32 pins is a guess but you get the idea)

[Portholme]

I had the same issue but didn't take out the cdi. Rectifier job is plug and play!!!

[phantom 19]

The plug is available from better Yamaha dealers - BHG should be able to supply. I have a complete set of plugs and terminals from Yamaha if you are stuck. You will need an AMP type crimper to fit the terminal.