6hp checked everything, won't run, ideas?

[69makinitmine]

I have a 6hp Seahorse, Mod# 6RL76A. I am getting mad at this motor, too simple not to work! Here is a list of what I've done...Set points at .020 3 times, Have GREAT HOT spark w/ new plugs, Checked exhaust passages for insects/blockage w/ none found, cleaned/blew out carb 3 times, no intake gasket leak, set float level with carb edge on 3rd time. Idle needle undamaged turned out 1.5 turns from bottom, compression ck both cyls same/cold/3 times w/ choke and throttle openull #1=30, pull #2=45, pull#3=63psi. With clear fuel line I can verify there is fuel available in bowl and up to pump. No case leak @ pump gasket either. Now, It will start with a shot of WD-40 and Either. when the either runs out it dies even with choke closed. It will not run, start or stay running @ idle/mid or full throttle. This tells me its not the idle circuit alone or the main circuit since throttle position doesn't matter. After all the pulling when it dies I ck plugs and they are clean and dry so it's not flooding OR getting fuel. My shoulder is sore from pulling and I'm out of ideas!

 

[F_R]

Re: 6hp checked everything, won't run, ideas?

OK, tell me that you removed and checked the high speed orfice plug. You did, didn't you? Sounds like it is plugged up.

 

[jameskb2]

Re: 6hp checked everything, won't run, ideas?

You've certainly put some effort in!

Still sounds like fuel delivery to me. How long did it sit with bad gas? Did you use a carb kit, and rebuild AFTER soaking it overnight? I'm still thinking those high and low speed jets are plugged, or the float needle is stuck. Just because you see gas in the line doesn't mean the bowl is full.

Compression is a little low, but could be stuck rings. I'd take a 1/8 can of SeaFoam, add it to a half full squirt bottle of premix, and feed the carb through the front with choke open, throttle closed. Keep it running as long as you can with squirts of the premix. It's gonna smoke, and might foul the plugs. After 5 to 10 minutes of this, I'd let it run on it's own and see if it dies. If it does, then I'd have to assume the carb needs a complete tear down, soak and rebuild with a carb kit. After the carb was rebuilt, I'd follow Tashadaddy's method for a decarb using Seafoam. Search that....

 

[69makinitmine]

Re: 6hp checked everything, won't run, ideas?

The high spd orifice plug, could that be called the main jet with diffuser tube attached? If it is then yes, Removed and cleaned spotless. Also cleaned the well in bowl by plug that feed the main jet. I am a hotrodder so the terms might be different but I did get this carb spotless and ck'd all idle/mid/main and vent passages with cleaner blown through and watched for flow out of all ports/holes. I did not pull lead shot plugs or round metal 3/8" pressed in plate plug.

 

[69makinitmine]

Re: 6hp checked everything, won't run, ideas?

Thanks for the help guys! The bowl is filling verified by pumping fuel through oump to end on line with finger over it, then attaching to carb and by hand pumping in more fuel. Also verified by pulling bowl plug and draining enough estimated to be a full bowl, definitly more than what the line AND pump would hold... Could the reed valves be bad? No corrosion when looking through carb hole, but if they were bad it wouldn't start on ether too, right? On the rings, I have a 4.5hp Evinrude I got to start and RUN on just Top=25psi and Bottom=15psi compression!!!!

 

[jameskb2]

Re: 6hp checked everything, won't run, ideas?

Well, fair enough.

I have no other answer! (I will watch and hope you post your findings when you have it solved.)

 

[69makinitmine]

Re: 6hp checked everything, won't run, ideas?

I keep ending up at fuel too/carb too!!! That's why I spent SO much time making dang sure I was getting ALL the ports cleaned out AND verifying by watching fluid flow out and through them... Wish I had a good spare just to swap out and try...So dang simple, I feel like the kid in "the Breakfast Club" that couldn't get the light to come on in his lamp for shop class!:redface:

 

[jameskb2]

Re: 6hp checked everything, won't run, ideas?

I keep ending up at fuel too/carb too!!! That's why I spent SO much time making dang sure I was getting ALL the ports cleaned out AND verifying by watching fluid flow out and through them... Wish I had a good spare just to swap out and try...So dang simple, I feel like the kid in "the Breakfast Club" that couldn't get the light to come on in his lamp for shop class!:redface:

LOL!

Got an F in shop? Dork! (kidding)

It's gotta be fuel as we all agree. There's a plug there somewhere. Reed valves? Nope...as you said, it wouldn't run or run very poorly.

My suggestion was to see if you could get it running long enough to vibrate / loosen any small varnish plug loose. The suction and vibe from a running motor can shake things up a bit. I've done that on lawn mowers and have had luck. Feeding through the carb throat to get it hot and running and then it'll run on it's own, and start up and work after that. It's just a shot though....no sure thing.

 

[69makinitmine]

Re: 6hp checked everything, won't run, ideas?

I will be buying a spray bottle tomorrow for shooting premix. I hated to use ether and WD! I will post tomorrow after 5pm central sometime (9 or 10 if it still gives probs) with update. I am going to check Johnson/Evinrude site parts diagrams and see if there is supposed to be a lead plug in the open hole on the top, thought it was a vent for diffuser but we'll see! And YES I do feel like a dork!!! Hehehe To F.Y.I. I also machined an aluminum bushing to fix the oblong hole in the upper plastic plate for the pull starter rope hootus, It works freakin awsome and will never wear out again! Something did go right!

 

[69makinitmine]

Re: 6hp checked everything, won't run, ideas?

I will be buying a spray bottle tomorrow for shooting premix. I hated to use ether and WD! I will post tomorrow after 5pm central sometime (9 or 10 if it still gives probs) with update. I am going to check Johnson/Evinrude site parts diagrams and see if there is supposed to be a lead plug in the open hole on the top, thought it was a vent for diffuser but we'll see! And YES I do feel like a dork!!! Hehehe To F.Y.I. I also machined an aluminum bushing to fix the oblong hole in the upper plastic plate for the pull starter rope hootus, It works freakin awsome and will never wear out again! Something did go right! It pays to have a lathe and mill in the garage...

 

[F_R]

Re: 6hp checked everything, won't run, ideas?

The high spd orifice plug, could that be called the main jet with diffuser tube attached? If it is then yes, Removed and cleaned spotless. Also cleaned the well in bowl by plug that feed the main jet. I am a hotrodder so the terms might be different but I did get this carb spotless and ck'd all idle/mid/main and vent passages with cleaner blown through and watched for flow out of all ports/holes. I did not pull lead shot plugs or round metal 3/8" pressed in plate plug.

Now you have me confused. "main jet with diffuser tube attached"?? Say what? I don't know what you mean by diffuser tube attached.
Anyhoo, the orfice plug is the main metering fixed jet. It is deep in the hole behind the hex drain plug in the carb float bowl. It is a threaded brass plug about 1/2" long with a tiny hole through it. Remove the drain plug and you are supposed to use a special screwdriver to get the orfice plug out. All the fuel has to go through that orfice.
I don't mean to dis-believe you when you say you have it spotless, but I just have to ask to make sure.

 

[69makinitmine]

Re: 6hp checked everything, won't run, ideas?

I had the term wrong, "emulsion" tube" instead of "diffuser tube". I did find the correct main jet where you said behind the plug. I assumed the end of the emulsion tube (screws in the post in center of float) was the main jet since it looks like one. That is where the the main jet is on a 4.5hp evinrude I'm working on. Made a screwdriver to fit and removed... 3/4 plugged. I saw fluid flowing through but not enough to let engine run...Cleaned. installed. runs great. wow. Sorry to waste your time. Missed the jet cause it's so well hidden. I should have looked closer and am mad at myself for not! You guy's are the best and thank you!!!:redface:

 

[wavrider]

Re: 6hp checked everything, won't run, ideas?

Glad to hear you got it running

Happens every day onm the carbs, it is so important to get the little jets cleaned out so fuel will flow through it.

 

[Mikekee]

Re: 6hp checked everything, won't run, ideas?

I too have the same problem with this motor. It will not start up. I read about the main jet in the carb, and checked it out. It's clean and free of stuff.
I have put everything into this motor. New rings,head gasket,crank seal,new starter cord and handle,plugs,carb gaskets. I put Gasket maker non hardening on every thing, including the block. Torqued the heads down, and checked every bolt. Re built the fuel pump with the instructions and pics of every part. Installed the pump to the motor, attached a drill to the nut on the fly wheel and gave it a try, fuel is coming out of the hose. So I checked the points, 20 thou each, free from dirt and grim, works and looks great, checked both the plugs are firing.

So I have spark, fuel, compression, and not a thing is running. WTF... is going on here people??? The reeds look good too, they both lay flat on the surface. This is the last part to find to replace these. Is it worth it or not? Why is this not running? Someone help me please...:grumpy:

 

[RogersJetboat454]

Re: 6hp checked everything, won't run, ideas?

I too have the same problem with this motor. It will not start up. I read about the main jet in the carb, and checked it out. It's clean and free of stuff.
I have put everything into this motor. New rings,head gasket,crank seal,new starter cord and handle,plugs,carb gaskets. I put Gasket maker non hardening on every thing, including the block. Torqued the heads down, and checked every bolt. Re built the fuel pump with the instructions and pics of every part. Installed the pump to the motor, attached a drill to the nut on the fly wheel and gave it a try, fuel is coming out of the hose. So I checked the points, 20 thou each, free from dirt and grim, works and looks great, checked both the plugs are firing.

So I have spark, fuel, compression, and not a thing is running. WTF... is going on here people??? The reeds look good too, they both lay flat on the surface. This is the last part to find to replace these. Is it worth it or not? Why is this not running? Someone help me please...:grumpy:

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