9.9 Evinrude. Why God, why?

[mutiny]

I've recently acquired an evinrude 9.9. Model number is 10824M. I've done everything I know how to do within my power and she still won't fire up. Compression reads 100 x 2. The fuel system is spotless, new fuel lines everywhere, and all new electronics. I've checked the flywheel key and nothing is out of order there. The electronics under the flywheel has been changed since they were pretty inexpensive. I've got a crisp blue spark across my spark board at over 1/2 inch. Spark plugs have been changed and I'm getting almost 250 volts out of the coils. The carb has been removed and a new rebuild kit installed even though it was spotless. It won't even try to start, even after getting desperate enough to use starting fluid. I've used starting fluid into the carbs, and removed the plugs and gave it a shot right into the cylinders. I know this isn't ideal for the cylinders, but I was grasping at straws. I've been at this too long and am reaching out for help. Any suggestions?

 

[tpenfield]

Plug wires reversed? If they are on the wrong cylinder, they will be firing the bottom of the stroke instead of the top.

 

[Crosbyman]

first things first… you need fuel oxygen fire to make a fire….

if you remove and ground the plugs while installed on their plug boots do they fire yes- no ?

if no…. work backwards to the ignition cct…

If yes did you try as suggested to reverse the plug wires ? yes no ??

if starter fluid won't make it pop I suspect dead ignition …. any kil button on this thing… disconnect it


patience brings joy …. Don't give up lots of help here and aomci site

http://www.leeroysramblings.com/Johnson 9.9_15.htm

 

[thatone123]

I have seen this in the 9.9/15 when the engine is flooded. There is no real proof that Ether (starting fluid) used in moderation is bad. I havd done it on dozens of outboards with no negative results I can see. Taking off without reaching operating tempeture is worse than a gallon of Ether and most don't bother, they just hit the accelerator. I mean a gallon used on hundreds of engines, not one, or you might go up in flames and explosions.

 

[oldboat1]

Could be a case in which the ignition output is good, but the plugs aren't firing. Maybe the plug gap is set too wide(?) Believe the oem plug is a Champion L78V, gapped at .030.

 

[Crosbyman]

we need answers to questions ?

"

if you remove and ground the plugs while installed on their plug boots do they fire yes- no ?"​

I doubt any gap would be to wide for the plugs not to fire ​

…​

 

[mutiny]

we need answers to questions ?

"

if you remove and ground the plugs while installed on their plug boots do they fire yes- no ?"​

I doubt any gap would be to wide for the plugs not to fire ​

…​

Sorry. I was at work for the night and couldn't get back to you guys. Doesn't a spark board accomplish this same test? I haven't tried grounding the plugs yet.

 

[mutiny]

Could be a case in which the ignition output is good, but the plugs aren't firing. Maybe the plug gap is set too wide(?) Believe the oem plug is a Champion L78V, gapped at .030.

I have a shop pack of L78V that are gapless plugs. I thought the same thing as well but after doing some further research, some called for the plug QL77JC4? I'm using the info from the service manual which states L78V.

 

[mutiny]

I have seen this in the 9.9/15 when the engine is flooded. There is no real proof that Ether (starting fluid) used in moderation is bad. I havd done it on dozens of outboards with no negative results I can see. Taking off without reaching operating tempeture is worse than a gallon of Ether and most don't bother, they just hit the accelerator. I mean a gallon used on hundreds of engines, not one, or you might go up in flames and explosions.

Engine is not flooded thats for sure. I have used my fair share of ether on other engines as well. And I agree with your thoughts on it. If its used to just get the engine quickly started, the mixed fuel is waiting to do its job almost instantly if primed properly.

 

[mutiny]

first things first… you need fuel oxygen fire to make a fire….

if you remove and ground the plugs while installed on their plug boots do they fire yes- no ?

if no…. work backwards to the ignition cct…

If yes did you try as suggested to reverse the plug wires ? yes no ??

if starter fluid won't make it pop I suspect dead ignition …. any kil button on this thing… disconnect it


patience brings joy …. Don't give up lots of help here and aomci site

http://www.leeroysramblings.com/Johnson 9.9_15.htm

Thanks for the suggestions and reply. I overlooked reversing the plug wires. This is a great idea. As far as a dead ignition, I can't see how this is possible. I'm ripping a blue flame across an open spark board at over 1/2 inch. My DVM reads over 250 volts at both spark plug boot ends. I'm going to give the reversing plug wires a shot to see how that may have got switched.

 

[Rook66]

Did you remove the core plugs (expansion plugs) on the carb to clean under them? They are items # 4 & # 5 on the Evinrude carb diagram for you model Evinrude. It shows 2 of them on your model. I didn't remove the expansion plug on one of my Evinrude's when I cleaned the carb and it wouldn't run. I took it back apart and removed the one plug that was in mine and then cleaned it again. I replaced the plug with the new one that was in the carb kit and it ran as good as new. There was some trash under it that didn't get cleaned the first time. If all else fails it maybe worth checking out.

www.*****************/parts/johnson-evinrude-parts.php?year=1978&hp=9.9&model=10824M&manufactur er=Evinrude&section=Carburetor+%26amp%3B+Manifold

Well this site won't let me post the site address to marine engine.c. o. m. where you can click on the Evinrude section and enter your model number to get the diagrams.

 

[mutiny]

Did you remove the core plugs (expansion plugs) on the carb to clean under them? They are items # 4 & # 5 on the Evinrude carb diagram for you model Evinrude. It shows 2 of them on your model. I didn't remove the expansion plug on one of my Evinrude's when I cleaned the carb and it wouldn't run. I took it back apart and removed the one plug that was in mine and then cleaned it again. I replaced the plug with the new one that was in the carb kit and it ran as good as new. There was some trash under it that didn't get cleaned the first time. If all else fails it maybe worth checking out.

www.*****************/parts/johnson-evinrude-parts.php?year=1978&hp=9.9&model=10824M&manufactur er=Evinrude&section=Carburetor+%26amp%3B+Manifold

Well this site won't let me post the site address to marine engine.c. o. m. where you can click on the Evinrude section and enter your model number to get the diagrams.

I am familiar with the site and is where I gather most of my info by diagrams. Thanks for the suggestion however, by spraying starting fluid directly into the cylinders and or carb it should still fire. Even if just for a second or two while the starting fluid burns off.

 

[mutiny]

So, I've switched the spark plug wires and shot it with some starting fluid. It backfired instantly. Twice when I tried pull starting it. It backfired exactly as if the plug wires were on backwards. It won't even backfire when the wires are installed properly. So frustrating.

 

[Rook66]

So frustrating.

I feel your pain. I've been there before. Try not to throw it in the lake.

Good luck to you.

 

[racerone]

Time to check that flywheel key again.----Use only a factory key.-----Tighten nut with proper torque.

 

[F_R]

250V at the plug wires is a false reading. It actually puts out thousands of volts.

 

[oldboat1]

So, I've switched the spark plug wires and shot it with some starting fluid. It backfired instantly. Twice when I tried pull starting it. It backfired exactly as if the plug wires were on backwards. It won't even backfire when the wires are installed properly. So frustrating.

got it to fire, anyway. It might be worth going back through the ignition assembly/reassembly (coils wired to the proper plugs and proper points/condenser assemblies, coils perfectly set on mounting posts and wired correctly to points and condensers.)

 

[Crosbyman]

parts 4-5 are dime size covers on the top of the carb they cover small drip holes used by the low speed section of the carb ...but you engine should pop with a squirt of gas in the carb … even more so with starter fluid

more of Leroy's see section on post 77 engines
http://www.leeroysramblings.com/Johnson_troubleshooting.htm

 

[racerone]

There are no points / condensers on a 1978 model 9.9.

 

[Nick68]

It's possible to install the choke rod upside down causing a very hard start, see Leroys ramblings, might be worth checking.