loss of rpm - Another question for Dhadley

[Kerry201pro]

Re: loss of rpm - Another question for Dhadley

Hey guys, Just wanted to jump in here since I am watching and learning and have almost similar problem. My 91' 200XP Rude has lost 500 rpms and about 7mph. I have replaced from Rapair the TB, Ppack and regulator with no luck. Ray @ Rapair is across the street. My coils ohmed out all the same at idle but could br breaking down at WOT.. I had a couple of guys suggest, though may be long shot but these OMC guys had seen similar problems with magent on flywheel possibly being loose or foraward shift linkage may not being engaging all the way. Not to interrupt your process but have almost exact problem so I am paying close attention and testing mine at the same time. Thx Kerry

 

[Dhadley]

Re: loss of rpm - Another question for Dhadley

Welcome Kerry!<br /><br />Good point, if the outside magnets are loose it does funny things.<br /><br />codkiller -- look up under the flywheel at the 6 magnets. They should all be in place tight and evenly spaced. Cant hurt to look.<br /><br />My e-mail is dhadley50@aol.com.

 

[codkiller]

Re: loss of rpm - Another question for Dhadley

4 of the six magnets were lose the rebuilder charged me 150$ to glue them back in, they didn't do it. I glued them in when I replaced the timer base.

 

[james roach]

Re: loss of rpm - Another question for Dhadley

You did not list coils as the items you replaced. If they are originals you probably have a bad one. It will fire fine and test fine until a real load (mid-wide open throttle) is put on them. My 1987 200 Johnson had the same problem as you are stating (500 rpm loss). I bought 2 coils @ 30.00 each and I found the bad one. It takes 2 minutes to switch them out. Keep switching them out if the first time does not find the faulty one. Once I found out it was the coils, I replaced the other 4 and the motor has not missed a beat since. Heat and moisture kill them and if they are originals, they have done their job and need to be replaced. I would be suprised if this did not solve your problem.

 

[codkiller]

Re: loss of rpm - Another question for Dhadley

james roach, You certainly have a valid point. Yes the coils are the originals. They did check out with an ohm meter so I figured they were ok. I guess I need to get out the check book again.<br /><br />Thanks for the input

 

[codkiller]

Re: loss of rpm - Another question for Dhadley

Guys is this the right coil?<br /><br /> http://ebasicpower.american-data.ne...ct_Code=GLM72010&Category_Code=OB-OMCIGNCOILS

 

[james roach]

Re: loss of rpm - Another question for Dhadley

I believe that is it. That is a great price. Just verify the model number with them. I would replace all 6 for that kind of money.

 

[codkiller]

Re: loss of rpm - Another question for Dhadley

6 are on order, should have them by Friday.

 

[RetNav]

Re: loss of rpm - Another question for Dhadley

codkiller<br /><br />I have been following this thread with great interest as I have two of the 90 model 200 hp evinrudes on a 26' Dusky. One of the motors will turn 6000 the other will run 5000 rpms. <br /><br />If you don't mind please post back with the results of the coil change or whatever you find to be the problem. Thanks

 

[Kerry201pro]

Re: loss of rpm - Another question for Dhadley

Guys, Want to pull my flywheel and check magnets. Which is preferred method.<br />1) USing 1/2 drive socket and flywheel holder and break nut loose.(If so is it 1 1/2 or 1 1/16 socket) I know it has to be thin walled.<br /><br />2) Using impact. If so does it need to be in nuetral whil epulling? <br /><br />Sorry for my ignorance on the questions. Just want to make sure. I have a couple different manuals but find th eknowledge by the users on this forum can provide much more.<br /><br />Thanks in advance Kerry

 

[codkiller]

Re: loss of rpm - Another question for Dhadley

Kerry, I think, but am not sure the socket size is 1 7/16" thin wall. I turned a thick wall socket down to fit. I purchased an OMC puller, the best money I ever spent. The pullers you buy in the auto stores are not beefy enough. I use an electric 1/2" drive impact on the nut and braker bar with a bull screw driver held against the flywheel teeth and starter, works great.

 

[codkiller]

Re: loss of rpm - Another question for Dhadley

RetNav, No problem, I will post the results. Should have the coils by Friday and plan to run it on the lake this weekend.

 

[RetNav]

Re: loss of rpm - Another question for Dhadley

Thanks codkiller, I'll be looking forward to your post.<br /><br />Kerry, I just bought a (heavy duty) puller at NAPA and it worked real good. Had to clean the goo from the trigger unit. It kept sticking and not allowing the timing to advance. The nut on the 200 is 1 7/16 or in a pinch a 36 MM will work.

 

[Kerry201pro]

Re: loss of rpm - Another question for Dhadley

Okay guys, Need some help here. I ohmed the coils out and all checked okay there. I guess the more acurate check for the possibility coil failing is to test with timing light. From what I gather from earlier posts on this, I could set boat in water on triler and run half throttle and check one by one to isolate the possibility of loosing fire from a coil. NAy suggestions welcomed. Just wanted to see if I could pinpoint for I have to say the treaded four letter word to my wife "BOAT". She always replies..... What Now!!!! if you know what I mean. I hate having a wife with financial degree Thx Kerry

 

[codkiller]

Re: loss of rpm - Another question for Dhadley

Kerry, I'm not an expert here, but I don't think you want to run any outboard at half throttle unless you have a load on it, you may have more to worry about that a bad coil. I plan on running the boat on the lake in calm water after I replace the coils and check each coil with a timing light at full throttle. Another option is you can take the boat to a dealer and have them put it on a dyno, run it at full throttle and check each coil with a timing light.

 

[Kerry201pro]

Re: loss of rpm - Another question for Dhadley

I had heard threw my last(former) boat mechanic they tested there's while on the trailer while backed in the water.. Said it provided enough resistance to emulate a load. It seemed weird to me or actually that he just didnt want to hastle with removing it from the trailer. He did have a tank though so maybe he was right or wrong, Im just a shade tree looking for some direction. My motor is on a Stratos 201 bass boat so it may me a little hairy sitting back there while buddy runs WOT.... But hey I will do anything to get to the bottom of this issue with my Rude. Thanks for the input and Ill run her on the lake and see what happens. Thx again Kerry

 

[Kerry201pro]

Re: loss of rpm - Another question for Dhadley

Please excuse my typing.... it is primative at times... Also we have a shortage of quality I repeat quality mechs in my area. have not seen one yet with dyno on hand. I know its sad but true..... Kerry

 

[Toontime]

Re: loss of rpm - Another question for Dhadley

question? would moving a tiny tach from plug wire to plug wire identify a cylinder losing spark at WOT?

 

[james roach]

Re: loss of rpm - Another question for Dhadley

I attempted that tese while the boat was backed into the water but I did not feel comfortable doing that. It is so much easier to buy a coil and switch it out after running for a minute or 2. It wont take long to isolate the bad one. The thing is if 1 is bad the rest are not far behind. For 12 bucks you just cant beat it. I paid 23.00 each and I thought I was getting a good deal.

 

[red10]

Re: loss of rpm - Another question for Dhadley

i had a bad coil once that ohmed out good when cold but when it got warm and with a load it was junk, so the resistance will change with temp.