1974 Evinrude 25hp wont run.

Dalejam

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Jul 3, 2009
Messages
109
is the plate vibrating a wear issue ?
I had to replace the coil on those old engine evinrude/johnson ..1965/75
so i orderd a locating ring so i can set the coil properly, i did order a new driver coil, not saying it is bad, but it is original. so to elimanate issues before i go back and look at the carb again. ill change those parts and see if it improves.
thank you all for the help.
Dale
 

j cat

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Oct 13, 2015
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100
so i orderd a locating ring so i can set the coil properly, i did order a new driver coil, not saying it is bad, but it is original. so to eliminate issues before i go back and look at the carb again. ill change those parts and see if it improves.
thank you all for the help.
Dale
well the coils have a smaller defect on the very old coils ..the steel laminates have rust , coil lower voltage on the spark plugs.
also the old carbs have a float change , and the carb ports that clean out ..
 

Dalejam

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Messages
109
So I got the ring to set the driver coil properly. Also adjust the linkage to the carb that goes to the cam roller. I am attaching some videos and pictures the first picture , when is the cam roller to move ? On the 2 little dots or the 2 lines. The video shows the motor running but I can’t get the idle any lower with out stalling. So I think I need to know what the two dots and line are for and when to set the cam Roller. I took the ignition system apart and ohmed out the coil. Disconnected the wires running to the coils nothing shorted to ground . When running at night no electric shorts showing up.

One last thing I am using gas from last year. 50:1
Motor smokes a lot . Yes I know get new gas. But could that also be a issue ???? About not running at lower speed .
As usual thank you all 🙏
Dale
 

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hardwater fisherman

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Mar 19, 2010
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The throttle plate should start to open in between the 2 dots. The 2 lines are for timing the ignition. The adjustment of the cam roller is for acceleration and not for idle.
 
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Dalejam

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Jul 3, 2009
Messages
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The throttle plate should start to open in between the 2 dots. The 2 lines are for timing the ignition. The adjustment of the cam roller is for acceleration and not for idle.
How do I get the idle to come
Down . Is it after it is running adjust the low idle speed needle ? How do you adjust timing with the 2 lines ?
 

hardwater fisherman

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You adjust the points with a timing fixture or with the flywheel and a volt meter .
 

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racerone

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We are now at post #69 and counting.------Idle issues are not always carburetor related.---And this carburetor has been cleaned a few times.------I am thinking there is an issue with crankcase compression.-----Not easy for a novice to diagnose.----Sorry ,----some inspection needs to be done.----Picture in post #67 is for earlier magneto.
 

Dalejam

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We are now at post #69 and counting.------Idle issues are not always carburetor related.---And this carburetor has been cleaned a few times.------I am thinking there is an issue with crankcase compression.-----Not easy for a novice to diagnose.----Sorry ,----some inspection needs to be done.----Picture in post #67 is for earlier magneto.
I know I asked about the idle. But what I was looking for how to adjust the roller cam. So when the roller cam touches the 2 dots ? Is there a way you can point me to see if crank case is the issue or a test I can try to give me some answers to why I think I have a problem…
Thank you for your help
Dale
 

hardwater fisherman

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We are now at post #69 and counting.------Idle issues are not always carburetor related.---And this carburetor has been cleaned a few times.------I am thinking there is an issue with crankcase compression.-----Not easy for a novice to diagnose.----Sorry ,----some inspection needs to be done.----Picture in post #67 is for earlier magneto.
I was just showing him the timing method. Are you going to tell me that you can't set the points on a 1974 model using the timing fixture?
 

racerone

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No I am not.----I believe bottom becomes top , and top becomes bottom if you use the earlier ( 1970 ) fixture.
 

hardwater fisherman

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We are now at post #69 and counting.------Idle issues are not always carburetor related.---And this carburetor has been cleaned a few times.------I am thinking there is an issue with crankcase compression.-----Not easy for a novice to diagnose.----Sorry ,----some inspection needs to be done.----Picture in post #67 is for earlier magneto.

No I am not.----I believe bottom becomes top , and top becomes bottom if you use the earlier ( 1970 ) fixture.
Okay. I just use the flywheel when timing points. Never used the fixture. My Service manual shows a fixture being used for that ignition. Maybe there are different fixtures.
 

racerone

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The fixture is identical looking to earlier ones.----I believe key way is changed by 180 degrees.----I have misplaced my fixtures and use the flywheel. ---As you know those fixtures are a " dummy flywheel " and a shop time saver.
 

clemsonfor

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I know I asked about the idle. But what I was looking for how to adjust the roller cam. So when the roller cam touches the 2 dots ? Is there a way you can point me to see if crank case is the issue or a test I can try to give me some answers to why I think I have a problem…
Thank you for your help
Dale
Did you figure it out? You have to adjust the linkages and such so that roller it between those two dots or right at the first one when the butterfly in the carb starts to open. That is when the timing is starting to advance and you can use the increased fuel for power so the two have to coordinate together...the timing advance and the opening of the butterfly.
 

Dalejam

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Did you figure it out? You have to adjust the linkages and such so that roller it between those two dots or right at the first one when the butterfly in the carb starts to open. That is when the timing is starting to advance and you can use the increased fuel for power so the two have to coordinate together...the timing advance and the opening of the butterfly.
So last night before it got to dark out, i loosend up the red arrow ( picture below is the refrence) then i turned the handle till the blue arrow cam roller touched the 2 dots the yellow arrow. then i tightend up the red arrow. so when i turn the handle back to off will say it does not touch the plate , nor does the butterfly in the back move. so in this setup motor starts right up i can get it to idle ok at a higher rpm. but i am new to this and seem to keep going back to the carb. so to eliminate the carb i need to set it up properly first.
so if i turn the handle back to shift mark, wont that make the butterfly close for the cam roller is not touching the plate. so in theroy from what i read, the brass , dont know what to call it picture below , Doesnt that allow the draft fromo the intake to suck up fumes to keep motor running.
hope this is said correctly.
i am new to this so i am putting in words taht make sence to me.

thanks for taking the time and helping me
Dale
 

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racerone

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Where is the gasket that goes around the nozzle?-----Fuel must all come through the high speed jet.----That item is hidden inside the carburetor bowl.-----When throttle plate is closed there is still a calibrated amount of air and fuel allowed into the engine.-----It must be so , since an idling engine needs OIL to keep running.----That lubricating oil is brought into the engine via the gasoline !
 

Dalejam

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Where is the gasket that goes around the nozzle?-----Fuel must all come through the high speed jet.----That item is hidden inside the carburetor bowl.-----When throttle plate is closed there is still a calibrated amount of air and fuel allowed into the engine.-----It must be so , since an idling engine needs OIL to keep running.----That lubricating oil is brought into the engine via the gasoline !
is this the gasket you are refering too. i did replace that when i rebuilt the carb.
 

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Dalejam

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Correct , that is the one.
so the next question is this part circled i know it stops you from turning the handle to a slow speed that it will cause the motor to turn off. question is what is the starting pont for this to be, how many turns out to start off.
next question alot of people put there own into this answer......
at what RPMS should the motr be in to shift into a gear. and how do i tell how many RPMS the moter is running at. a device or tool
thanks
Dale
 

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