65Hp Evinrude bogging at WOT

[tr918]

Re: 65Hp Evinrude bogging at WOT

I swapped the coils and checked it at idle and I am not losing spark. Have not had a chance to take it out on the water again and check for spark at WOT. Weather permitting I plan to get it out this weekend and test it. Thanks again for your help. It is greatly apreciated.

 

[fireman57]

Re: 65Hp Evinrude bogging at WOT

I'm waiting on the weather too. The reason you need to check it at WFO is that is where the problem shows up. I'm still betting that one is not assembled perfectly. I "knew" that I had mine together right but still had the problem. I finally marked them and made sure that the pin was centered exactly in the wire and the problem went away. I wish that Bombardier would preassemble and test them before shipping. I would pay them five bucks more. Check it with the coils swapped and see if the problem follows.

 

[tr918]

Re: 65Hp Evinrude bogging at WOT

After dealing with this I would pay them more than five bucks. I did do as you suggested prior to the last full throttle run. I marked the wires and made sure they were seated on the pins. I even bought new terminal boots and replaced the ones that came with the pack. The originals did not fit on the spark plug correctly, they were very loose. The coils are currently swapped from tinkering with it in the driveway and dodging the rain. When I get it out on the water at WOT I will have a chance to verify if they are on correctly. <br /><br />I was going over the engine tonight looking to see if I had overlooked anything obvious. There was a concernable amount of fuel in the bottom of the engine compartment below the carbs. The bottom of the carbs are very wet. It looks as if the carbs are leaking considerably. <br /><br />I need to do some more testing but if my spark checks ok at WOT then I might have to tear into the carbs <br /><br />Sorry for the long post. I will keep you updated. Thanks for the help.

 

[fireman57]

Re: 65Hp Evinrude bogging at WOT

We just to eliminate spark at this point so we know that it is fuel or air. If you have fuel dripping from the carbs it is definitely time to rebuild. You may have a stuck float or stuff in your high speed jet.

 

[tr918]

Re: 65Hp Evinrude bogging at WOT

I finally got the opportunity to take the boat out and test it on Saturday. I wiped down and cleaned the out side of the carbs before taking it out. while it was running there was no obvious leaks/drips anywhere. I think the fuel could have bounced out of the carbs on the way home last time. <br /><br />The problem is still spark. Pulled the plug wires while at WOT and there was no rpm change on the #2 cylinder. Brought the boat back to the ramp in order to swap coils to see if the problem followed. Then down came the rain!! <br />I played with the #2 coil a little the wire still is not seated all the way down. It was centered on the pin though. I will repair the coil and swap them again and try to get it on the water this week.<br /><br />Thanks for your help so far Fireman57. I'll keep everyone updated.

 

[fireman57]

Re: 65Hp Evinrude bogging at WOT

I'm waiting on weather too. When you swap the coils we want to see if the spark fails on the same coil. If it fails on the same cylinder then the problem is before the coil. If it fails on the cylinder that you swapped the coil to then we can almost be sure it is the coil.

 

[rachael]

Re: 65Hp Evinrude bogging at WOT

Dear fireman57,<br />I noticed you said above in a post about getting a nice blue spark. well I am having same problem as TR918 however when I check my spark after bogging down, both plugs only have a very small orange spark. when i checked spark before bogging down it was nice big and blue. I have changed out booster coil and wires. new plugs and also changed out electronics under flywheel. nothing changes situation. I start up runs fine I open throttle it gets up on the plane for about 15 seconds then bogs down. if i let it idle a while it will get on plane again but for a shorter time. it seems like something is over heating. plenty of water cylinder head is not overly hot, none of the other electronics are hot only the flywheel seems a little hotter than it should be. any suggestions. thanks rachael. Oh and my engine is 2000 40hp johnson

 

[fireman57]

Re: 65Hp Evinrude bogging at WOT

If you have a powerpack on this engine then at this point I would suspect it. You have to have a strong blue spark. Something is breaking down under a load. If you had to assemble the coils yourself make sure you recheck them for the wire to be centered in the coil and screwed all the way in tight. Could have just vibrated loose after you plugged them in. When you get them in right and the engine runs good then glue them onto the coil with some good epoxy so they can't back out. Also make sure that the plug end is centered in the wire and is seated well on the plug. You might also check for a sheared or sloppy flywheel key if you didn't torque it down to spec.

 

[rachael]

Re: 65Hp Evinrude bogging at WOT

Thanks fireman57, It does have a powerpack and I will try that next. The coils on this engine don't have any screws or anything so I don't know about that. it just has HT lead from booster coil to plug. HT lead is the kind where wire is soldered directly to the clip. and the coil is a sealed unit with just 4 posts two for spark plug 2 for powerpack. Flywheel key is fine. I will check power pack. Thanks Rachael

 

[tr918]

Re: 65Hp Evinrude bogging at WOT

Rachel, Some of the replacement coils for older E/J motors have HT wires that have to be assembled and connected to the coil. Fireman57 was asking if you had this type of coil and had to assemble the coils yourself. If you have that type of coil the HT wire has to be pushed onto a pin on the coil. In order to get this wire on you have to use a pair of pliers and twist it onto the pin and push the wire into the hole....He refered to this as screwing the wire into the coil. Hope that helps clear it up. Good luck.

 

[tr918]

Re: 65Hp Evinrude bogging at WOT

Bad news, I took the boat out today and the spark problem did not follow the coils when I swapped them. The problem stayed on the #2 cylinder. <br /><br />The next question is how do I test the power pack and Charge coils with out a m80/s80 neon tester or a peak voltmeter? <br /><br />I mentioned earlier that I resistance tested the charge coils. The charge coils read ~830 ohms. Clymer manual says normal is 870 to 930 ohms. Resistance is lower than the specification. <br /><br />Should I replace the Charge coils or should I go after the power pack? <br /><br />Firman57 thanks for your help with the ignition coils. Without it I would never have been able to assemble them correctly!

 

[fireman57]

Re: 65Hp Evinrude bogging at WOT

It is not your coils if the problem did not follow. Suspect the pack. Teh dealer can test it for you. Do you know someone with the same engine as yours that yo can borrow the pack from to test with?

 

[tr918]

Re: 65Hp Evinrude bogging at WOT

Thanks. That is the problem I ran into when I first started having the bogging problem. I called the local dealers and shops and only one out of a total of 20 dealers/shops said they would even look at an engine older than 1980. And the one shop that would work on it could not get me in for 3 months. This is why I decided to try working on it myself. My original coils were arcing to the bracket that they are mounted on which is why I suspected them first. I now know that it was only part of the problem. I don't know anyone that has a pack similiar to mine. I will call the shop that will work on it and see if they can just test the pack. Thanks again.

 

[fireman57]

Re: 65Hp Evinrude bogging at WOT

You can price a pack and see if you want to try it. Might work or it might be something leading up to the pack.

 

[rachael]

Re: 65Hp Evinrude bogging at WOT

Hi <br />its Rachael again... I am at the end of my wits here. I have replaced just about everything electrical on this engine and still have the same problem. I accelerate get on plane 10 seconds later it boggs down. it sometimes picks up boggs down several times all by itself before settling down into a bogg. The only thing I haven't replaced is the outer electrical unit under the flywheel. there are two sealed units under there one is small and uses the magnet on inner part of flywheel the other is larger and has pickups on the outside to use outer flywheel magnet. Does anyone have any suggestions. I use this boat as my means of transportation and need it running. Any help would be greatly appreciated. Thanks Rachael

 

[fireman57]

Re: 65Hp Evinrude bogging at WOT

Have you checked to see if your flywheel key is sheared or sloppy?

 

[tr918]

Re: 65Hp Evinrude bogging at WOT

Thanks Fireman! I found a pack, not a bad price for a local dealer..~$125. And they had it in stock.(no waiting ) I got the part on and plan on testing it tonight. <br /><br />Rachael, Your problem does sound electrical, but did you check to try and eliminate fuel/air first?(just asking) When you said you changed the electronics under the flywheel, which electronics were you refering to? Have someone go with you and drive the boat so you can pull the plug wires off of the spark plugs one at a time. Do this while the boat is at WOT. If the rpm's of the motor change when you pull a plug wire then that cylinder is getting spark at WOT. If the rpm's do not change then there is no spark at WOT. This should tell you which cylinder is not firing. If the rpms change then your problem may be fuel/air related.

 

[tr918]

Re: 65Hp Evinrude bogging at WOT

Rachael, One more thing if you do not have a manual, I would advise investing in a good factory manual. I have the Clymer manual. It is ok but not as detailed as I would like it to be. Factory manuals are by far better. Good luck.

 

[tr918]

Re: 65Hp Evinrude bogging at WOT

I got fed up chasing the problem alone. I finally got into the one shop in the tristate area that will work on my old engine. They got different compression numbers than me. Cyl 1 - 40psi, Cyl 2 - 60, Cyl 3 - 60. I asked them to check the electronics at WOT for me. They refused at first saying they were convinced that it was a low compression problem. I explained to them that I was getting higher compression numbers (Cyl 1 - 120psi, Cyl 2 - 110, Cyl 3 120). I then re-explained my problem. AT WOT the #2 Cylinder is not firing(no spark). They then informed me they did not have a test tank and it would be hard for them to test spark at WOT under load. Before dropping the boat off to them I asked them if they could perform this test for me and if they could make sure the stator coil and timer base were working properly. They informed me they could. Which is why I took the boat up there. After they informed me of the compression findings I talked them into testing the electronics. They reluctantly said they would. A week and a half later they called back and said they did a spark test at WOT and spark tested fine. The shop still insisted that the problem is compression and offered to rebuild the powerhead for 1300 to 2000 depending on what it looked like when they took it apart.<br /><br />I have now had the boat back for 2 days. I have not had the time to recheck compression. It is first on my list of things to recheck. <br /><br />I am not discounting what the shop said. It very well could be compression. I could have been doing my compression tests wrong or my tester readings could be off. <br /><br />Everything in this post so far has pointed to spark and I find myself now very confused and bewildered!<br /><br />I will recheck my compression and repost. <br /><br />In the meantime does anyone have any thoughts or suggestions??

 

[fireman57]

Re: 65Hp Evinrude bogging at WOT

Sorry that you have been through the mill with this engine. The shop's compression numbers do see a bit low and your numbers seem fine. If you are only losing spark to number 2 cylinder then I cannot blame that on compression as both the shop's and your number two readings were equal to or above the rest. It has to be something fairly simple I think. Have you checked your point gap and cleaned it as well as changing the condenser? Just a thought.