1988 yamaha pro50LG hard cold starting

[Collinsje308]

This is where i found a new CDI box.....https://www.outboardignition.com/


Thanks,

[panasonic]

Glad you got it fixed up.Where did you dig up a replacement CDI for that engine?

[99yam40]

I would not have thought killing spark to just #2 would shut down the motor
good to hear it is running well now

[Collinsje308]

It had good peak voltage coming into the CDI but had an intermentant no spark condition coming out going to the #2 coil. That caused the whole motor to just shut down just like you switched off the key.

[99yam40]

Interesting, what did you find wrong with the CDI?

maybe Good peak voltage into CDI and bad coming out of it to the ignition coils?

[Collinsje308]

Hey everyone,

I wanted to add an update here, I also had a faulty CDI box. Replaced that and now she starts and runs like a top!!!! Thanks for everyones help.

[99yam40]

good the hear,
report back if it gives trouble again

[Collinsje308]

Hey all,

Thanks again for your help. I got the chance to take the boat out over the weekend. I bought a new battery for it and installed it. I made sure the motor was level with the water, pumped the bulb, pulled out the choke and cranked the motor for 5-10 seconds and she popped right off. So i dont know if it was the fact that it was 70 degrees out this time, or the new battery or the motor being level before i pumped the bulb. but either way i am happy to say that i think this issue is resolved. Thanks again.

[panasonic]

Take the airbox off,get a bit of mixed gas in a squirt bottle, open throttle, spray a small amount into each carb throat, close the choke and try to start with throttle at start position. If it fires right up, as it should, then you know you have a fuel problem.

Careful spraying gas around....have a small fire extinguisher handy.

[Collinsje308]

I didn't get a chance to work on the boat yesterday due to the snow storm we had come through. I will hopefully get to it today or tomorrow. Thanks again guys.

[boscoe99]

Still working until April 20, then forced vacation for Two months...at least. We are still flying 10% of normal schedule. Airplanes parked all over the place. Small number of mechanics will be kept on to do the storage maintenance...which is going to keep them very busy.

Hopefully this will start to turn around in a few months...need a vaccine for this dirt sooner rather than later.

Everybody please be smart and safe!!!

ps. Boeing is to big to fail.

Yes, Boeing is too big to fail. Gonna be interesting. USG has hammered Airbus for getting European government support. Now the USG will support Boeing. The worm has turned. Methinketh governments are hypocrites.

Check out this video of parked aeroplanes all over the world.

https://www.avweb.com/multimedia/bes...airline-fleet/

[Collinsje308]

Hey guys thanks for the advice.

I would prefer to exhaust all other options before I have to take the carbs apart. I am no stranger to single carb motors but this one has three and I am afraid that I will never get them linked and synced back together correctly. And I can't find any information online as to how to adjust them. I think I know what the air/fuel screws are but I can't find what they should be set to anyway.

99yam40, my compression numbers were 110,112,110 in that order from top to bottom. And as far as timing goes I don't have the correct tools/meter to check timing on it so I have to trust the tech that worked on it and he said the timing is right. As far as the battery goes I actually bought a new battery for it today thinking that that might be the problem as the battery I had was up there in age and was my deep cycle battery out of my other boat. So I bought a new interstate Marine 800 CCA starting battery today. I am going to put it in tomorrow and try in out with the muffs in the driveway.

Will post back with the results.

Again I appreciate your guys help.

[99yam40]

I checked to make sure the throttle plates move/open some at the start position and they do.

Anybody else have any other ideas i could try or things I could look into?

OK back to the thread.

for a motor to fire up, it needs good compression, good spark at the correct time, and the proper fuel to air ratio.
you said the compression was OK, but never said what the reading were.
It is a very old motor
something is lacking, just need to figure out what it is.

are you sure the motor is spinning fast enough?( good battery and starter?)

[panasonic]

Hey Pan, how you doing up there?

Air line industry is in the toilet. Whole economy is looking grim. Read that global commercial aviation is down 96%. Only way Boeing can survive IMO is if the USG props them up. They were hurting before Covid. Covid should be the final nail in their coffin.

Take care and be well.

Still working until April 20, then forced vacation for Two months...at least. We are still flying 10% of normal schedule. Airplanes parked all over the place. Small number of mechanics will be kept on to do the storage maintenance...which is going to keep them very busy.

Hopefully this will start to turn around in a few months...need a vaccine for this dirt sooner rather than later.

Everybody please be smart and safe!!!

ps. Boeing is to big to fail.

[boscoe99]

Hey Pan, how you doing up there?

Air line industry is in the toilet. Whole economy is looking grim. Read that global commercial aviation is down 96%. Only way Boeing can survive IMO is if the USG props them up. They were hurting before Covid. Covid should be the final nail in their coffin.

Take care and be well.