Question for Joe Reeves

tbeaun

Seaman
Joined
Jul 16, 2005
Messages
59
I just purchased & installed an OMC tach for my 1974 115 hp Johnson. It has an 8 pole stator. I set the pulse to 4 & got an idle read of 1200 RPM. Wouldn't that be about twice idle? I have a Johnson service manual but idle RPM is not specified. You expert advice would be greatly appreciated.
 

Hunky Dory

Petty Officer 2nd Class
Joined
Jul 20, 2003
Messages
102
Re: Question for Joe Reeves

Ever been to Vegas? Some people win big, the others pay for the lights! <br /><br />Friend and I bought early 60's era 14' w/18hp which tried to start on first tentative pull through after presoak with lube. Ran perfectly after some effort and $9.95. The Seafoam did its magic, spark plugs smmothed the idle and I radically adjusted the mixture for this altitude. The boat was absolutely, perfectly, 100% dry, and after we redid the varnish -- jackpot! <br /><br />Bought a seemingly beautiful old baysponge I/O on eBay. Arrived moss covered on a green trailer, with a scuffed-through chine, roller broken keel, fool's-gold patches and rusted starter. <br /><br />At least the floor was firm, the transom strong and the motor and I/O were good inside. The intermittant complete electrical shutdown was entertaining. Fortunately it was not experienced on the maiden voyage at 39 degrees in the wind when I discovered the engine petcocks were not "tightly closed" but rather frozen-open. The bilge pump worked! <br /><br />Eventually found corrosion in a full-harness connector hidden inside shrinktube in the dankest corner of the boat. Of course!<br /><br />'Twas a "learning experience". I had a lot of fun going through all the systems and the next guy got quite a bargain (and loves the boat). I I lost my keister on the deal because I did the systems before the hull. And I was overmatched on the hull. Craps!<br /><br />But lately I've heard of an old 30 horse Merc halfway for sale at a negotiable price. Am watching for an old boat to match. Should be fun, but could be another disaster...<br /><br />After all them smatta pills I've eaten I'll be looking at: Keel (telltale is vertical crease in hull, could be faint - see reflection), transom, floor, dry rot, lower unit oil (as in not goo, not "too" sparkly), free spin in neutral, no spin in gear (both F&R - it might be normal to click/spin one way in F, the other in R as if attached to ratchet wrench). I'll listen for equal "thump" on pull-through, or better yet, see equal and reasonable gauged compression on all cylinders. I'll check prop condition, battery, and what the Coast Gaurd doesn't call "extras". <br /><br />Anything ahead of the prop on this list could double the moving-under-its-own-power cost. The beauty of it is -- if you love it enough, that's not too much!<br /><br />I might have dumpstered the baysponge and sold the motor, I/O, trailer and especially the tilt mechanism for twice what I got for the whole leaky kaboodle. Couldn't do it -- it looked great on the water and the new owner was more than glad to fix whatever I hadn't at the price I set. And I still get to see it on the lake!<br /><br />BTW: Our big 'ol outboard pontoon is ideal for casual use and leaves plenty of time for other adventures...
 

Hunky Dory

Petty Officer 2nd Class
Joined
Jul 20, 2003
Messages
102
Re: Question for Joe Reeves

Help! :eek: :eek: :eek: <br /><br />I was posting a reply to an inquiry about buying a 68 Evinrude! Somehow my response landed here and makes me look like a magnitude 3 dufus -- I only admit to magnitude 1...<br /><br />Further, the target post seems gone -- did I just step into the Twilight Zone? :confused: :confused: :confused:
 

tbeaun

Seaman
Joined
Jul 16, 2005
Messages
59
Re: Question for Joe Reeves

Originally posted by Hunky Dory:<br /> Help! :eek: :eek: :eek: <br /><br />I was posting a reply to an inquiry about buying a 68 Evinrude! Somehow my response landed here and makes me look like a magnitude 3 dufus -- I only admit to magnitude 1...<br /><br />Further, the target post seems gone -- did I just step into the Twilight Zone? :confused: :confused: :confused:
ROFLMFAO!!!! Thanks for the laugh.
 

tbeaun

Seaman
Joined
Jul 16, 2005
Messages
59
Re: Question for Joe Reeves

Thanks, Joe. I'll change 'er first thing in the morning
 

Hunky Dory

Petty Officer 2nd Class
Joined
Jul 20, 2003
Messages
102
Re: Question for Joe Reeves

Still trying to vindicate myself! :eek: :eek: :eek: <br /><br /> The other guy's post! <br />
1968 evinrude model #58593 A, serial #EO5899. This is another attempt, my first post was lost somehow.
It was the Twilight zone! Any way to edit these things?
 

Basscat 1

Chief Petty Officer
Joined
Feb 11, 2005
Messages
444
Re: Question for Joe Reeves

tbeaun, I think we had this discussion before. You need to pull the flywheel and count the number of poles on the stator. In 1974 the stator assembly is made up of 8 alternator coils and 2 charge coils. With this configuration, the tach needs to be set on 4 not 6.<br />When you asked about the idle at 1200 rpms, was that in the water or out on muffs? The engine will idle higher out of the water on muffs. It should be in the neighborhood of 1000rpms on the muffs, and set at 650 in the water IN GEAR.<br />Take a look at the picture below, it shows what your stator should look like. The two black poles are the charge coils.<br />
alternator.jpg
 

Basscat 1

Chief Petty Officer
Joined
Feb 11, 2005
Messages
444
Re: Question for Joe Reeves

It has 8 poles but it only emits 6 pulses?<br />Why did OMC tachs have different settings on the back if all of them emitted 6 pulses?<br /><br />Would the following statements be true?<br />"As said before the number from 1-6 represents the number of pulses from the stator. A stator will give out a pulse for each pair of poles so for 6 pulses you would have a 12 pole stator."
 

Basscat 1

Chief Petty Officer
Joined
Feb 11, 2005
Messages
444
Re: Question for Joe Reeves

Joe, I thought this board was set up for people to learn. I asked some questions. I am not trying to set up a debate. I respect your 30+ years at OMC. However, you should respect my questions.
 

tbeaun

Seaman
Joined
Jul 16, 2005
Messages
59
Re: Question for Joe Reeves

Originally posted by Basscat 1:<br /> tbeaun, I think we had this discussion before. You need to pull the flywheel and count the number of poles on the stator. In 1974 the stator assembly is made up of 8 alternator coils and 2 charge coils. With this configuration, the tach needs to be set on 4 not 6.<br />When you asked about the idle at 1200 rpms, was that in the water or out on muffs? The engine will idle higher out of the water on muffs. It should be in the neighborhood of 1000rpms on the muffs, and set at 650 in the water IN GEAR.<br />Take a look at the picture below, it shows what your stator should look like. The two black poles are the charge coils.<br />
alternator.jpg
Bass, Ive seen this pic a number of times & also have the Johnson Service Manual stating it is an 8 pole stator. I had it set to 4 & got a 1200 RPM idle read w/ muffs. It may sound weird (& I thought so too) but setting it to 6 pulse put the in-water reading to what I believe is normal. Idle read now is between 800-1000, 650-775 in gear. RPM @ WOT is 6000 with a 13 1/4d x 17p aluminum prop. Looking to get a 21 pitch SSP.
 

Basscat 1

Chief Petty Officer
Joined
Feb 11, 2005
Messages
444
Re: Question for Joe Reeves

I had it set to 8 & got a 1200 RPM idle read.
You had the tach setting on what? 8 or 4?<br />The idle was at 1200 in the water in gear?<br />_________________________________________________<br /><br />Never mind. I see you edited your post.
 

tbeaun

Seaman
Joined
Jul 16, 2005
Messages
59
Re: Question for Joe Reeves

Sorry, tach was set to 4 & put out a 1200 read w/ muffs. Changed to 6 & got 800-1000 w/ muffs out of gear & in water out of gear......650-775 in gear.
 

Basscat 1

Chief Petty Officer
Joined
Feb 11, 2005
Messages
444
Re: Question for Joe Reeves

Here is another question. Does your Johnson Service Manual state you have a 6 Ampere charging system?
 

tbeaun

Seaman
Joined
Jul 16, 2005
Messages
59
Re: Question for Joe Reeves

Originally posted by Basscat 1:<br /> Here is another question. Does your Johnson Service Manual state you have a 6 Ampere charging system?
Why did you ask this question? I'm waiting to see where this is going so I can learn something.
 

Basscat 1

Chief Petty Officer
Joined
Feb 11, 2005
Messages
444
Re: Question for Joe Reeves

I was just comparing my 1974 85 hp Johnson to your 115 hp. Looking at my Johnson service manual, it states I have a 6 amp charging system made up the alternator and rectifier. The alternator is made up of two parts-the flywheel with cast-in magnets and the stator assembly which is made up of 8 alternator coils and two charge coils.<br /><br />Now switching gears a little bit. I am in the military and I have worked on M-1 tanks for 22 years. The tachometer in the tanks are similiar in that they are electrical and read a pulse signal. The signal is emited each time a gear with a hole in it passes by a magnetic charged sensor. This is why I am trying to mechanically figure out how a stator with 8 poles only emits 6 signals? The only logic I can aquire is that the signal is emited between each pairs of poles? However, if thats the case, how come when the flywheel passes by the two charge coils and the other two points a signal is not emited?<br />Anyhow, sorry I didnt mean to open a can of worms, I just want answers too.
 
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