engine bogging

[curtis1979]

Re: engine bogging

Ok thanks I did go buy a inductive timing light but I really don't know how to use it. I want to make sure all the coils are working. Can I use the light for that?

 

[willy007]

Re: engine bogging

When I took the other three off it did bog a little. (1) The carbs have been took apart and cleaned. I really don't know how to adjust the floats or get to them. The guy I bought this boat off of cleaned the carbs for me so he says.(2) I just don't wanna start taking the carb apart and never get it back together right. (3) If I had some thorough instructions I would attempt it. Thanks

A couple of things...

1. If 3 cylinders cause it to bog and 1 doesn't than you have at least narrowed your search.
2. How much to you trust the guy that you bought it from? I know a LOT of people who run a can of fuel system cleaner through the gas and call it "clean"... if it hasn't been completely disassembled and soaked than it has not really been cleaned.
3. Those carbs are VERY easy, great for someone who has never done them before. I did a pair this past Saturday/Sunday (1 day soak) and they are very self-explanatory. Check for carb cleaning in the top secret file here on iboats and you'll have all of the direction that you need plus the adjustment for the float and the check to make sure that it's set correctly. All of the jets are fixed and don't have any adjustment on them. Get the carb rebuild kits to replace the needle, gaskets, and screw seals. I'd fork over the money for the special orifice tool as well... part #317002... You can try a modified screwdriver but it works so nice and than you have it.

 

[CaneCutter79]

Re: engine bogging

That’s a good idea about removing plug wires one at a time. I’ll have to try that myself.
I think you’ve already eliminated the carb as the issue anyway. When it made no change on the one cylinder when you disconnected your plug wires, I think you found your problem. Could be a bad coil or a bad spark plug. I’d look into that going forward.

As I was browsing in my repair manual earlier looking for the compression spec, it advised to look for vacuum and air leaks. According to the manual, older engines suffering from hard starting should be checked for pressure leaks. Reason being, the motor essentially needs uninterrupted fuel supply and air in the correct proportions, proper ignition at the right time, and adequate compression to function properly. If anything is lacking, the motor will not run or not run correctly. It may not show up on the compression tests. Use a soapy liquid in a spray bottle and spray around the following: crankshaft seals, spark plug threads, cylinder head gaskets, cylinder base, carb mounting flange, crankcase joint.

I forgot I had this manual as I usually use a hardcopy that’s original from 1979 and the PDF version I have is more modern and full of good info. I recommend it. You can buy it online as a downloadable PDF. I believe I bought it from iboats. I can’t remember but a quick search should result in what you need.

 

[CaneCutter79]

Re: engine bogging

Ok thanks I did go buy a inductive timing light but I really don't know how to use it. I want to make sure all the coils are working. Can I use the light for that?

I was told to connect the clamp to a plug wire and watch the light (don't stare into it! LOL!) on the floor and see if the light flickers or flashes out of sequence or dims. Should be a steady flash with a constant rhythm. From what you said earlier, I'd test that bad cylinder first. The one that made no difference. If it's a coil issue or upstream from the coil, it will show up. If it doesn't, could be the plug. Re-arrange the plugs and then try your plug wire pull test again. Then you HAVE found your issue.....swap out the bad plug and try the motor.

That easy........

 

[CaneCutter79]

Re: engine bogging

I'll help you with the carb kit if it comes to that. I'm more worried that you have a failing cylinder like I did........crossing fingers for you.

 

[curtis1979]

Re: engine bogging

Ok thanks for all the info. I will check the spark with my timing light. I will keep you updated on everything. I'm going to order the carb kit and try it. Whats the best stuff to soak it in.It's good to have help like this. This site is the best thanks again

 

[CaneCutter79]

Re: engine bogging

Per the manual, do not "soak" or submerge the carb. Use an aerosol based solvent (Gunk carb cleaner) with a brush and clean thoroughly. There is a sealant around the metering tubes on the casting and soaking in a hot bath of carb cleaner will damage the sealant.

 

[curtis1979]

Re: engine bogging

What type of carb kit do I need for this engine?

 

[CaneCutter79]

Re: engine bogging

I'm pretty sure the Evinrude/Johnson outboards are interchangeable for this era. They are essentially the exact same thing.

Go to Evinrude.com and look up your year number and model number of motor. Should be able to find a carb kit there. MUST have your model number. It's located on the transom mount I believe. There's a plate somewhere that gives the model no.

 

[TraskRiver]

Re: engine bogging

You mentioned it ran good on the "separate tank you hooked up" But when switched back to the old tank it ran funky again. Then you replaced the lines and still the same problem.
How about checking to see if that particular tank is venting properly. Without a properly working vent it will starve for fuel, then pick up and run ok for a bit, then starve etc...

 

[curtis1979]

Re: engine bogging

It ran really good with a separate tank with sea foam. The next time I went out after I cleaned out the permanent tank it ran good for 5 minutes. Then it started acting like it was running out of gas. I hooked up the other tank and the same. I stopped for 5 minutes and it won't go past 10 mph. It just acts like its nnot taking the gas. To run really fast but sputter then in 5 minutes to not go over 10 mph is really frustrating. I can hold it wide open and it just won't pick up when it does start doing it. My vent is good on both tanks too. I can't figure it out at all. It does idle pretty good and goes slow good.

 

[curtis1979]

Re: engine bogging

It ran really good with a separate tank with sea foam. The next time I went out after I cleaned out the permanent tank it ran good for 5 minutes. Then it started acting like it was running out of gas. I hooked up the other tank and the same. I stopped for 5 minutes and it won't go past 10 mph. It just acts like its nnot taking the gas. To run really fast but sputter then in 5 minutes to not go over 10 mph is really frustrating. I can hold it wide open and it just won't pick up when it does start doing it. My vent is good on both tanks too. I can't figure it out at all. It does idle pretty good and goes slow good. What can I do.

 

[curtis1979]

Re: engine bogging

Ok I took carbs off and cleaned thoroughly. One thing I saw was the float was way too high and tilted. I set it like it is supposed to be. Will this cause this type of problem? Its raining out so I will update on how it goes.

 

[CaneCutter79]

Re: engine bogging

Have you pulled your new spark plugs? Take photos of each plug according to which cylinder and post. I'm betting fouled plug or bad coil. If excessive carbon build up, you have ignition problem.


My motor ran great yesterday other than loading it as my motor issues occur when trying to load the boat on trailer or starting and idling forward or especially in reverse. It also did not want to get on plane yesterday about 3 times. Would not run past 2,000 rpm I believe. Same issue as yours right?

Well after about 8-10 seconds, something kicks in and the motor takes off like someone slapped a horses behind! Lol! So......in my mind, float settings is not the issue. I won't rule it out and good for you for finding it. I hope you set it based on a manual?

I have a timing light and hope to take mine out to get it warmed up. I only have the issue when its warm. I was told that's a sure sign of a failing ignition component. Could be as simple as a bad plug or possibly a bad coil. Worst case is power pack or worse, magnet trigger on flywheel. If failing trigger, it wouuldnt run right at all in my mind. I think its a coil, plug wire, or spark plug.

The new aftermarket coil design is STUPID in my opinion. The plug wires come disassembled and the wire is only connected to the plug clamp by twisting wire around it. No soldering, mechanical fastening, etc. Just twisted around by hand. Seems like its begging for issues to me. I have two newer coils vs. the 34yr old coils from factory. Amazing they lasted this long. I was told they are like light bulbs......they go out without warning.

 

[CaneCutter79]

Re: engine bogging

I found this in my manual today. Might be worth looking into.