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1963 Evinrude Sportwin 10hp Throttle Issue

C

Chadbud

Member
Hi guys! I'm starting a new thread for this issue as I need to have this fixed by my vacation next week so quick advice is essential to me! Thank you in advance to those that take the time to help me with this!




So after doing a tune up on my 1963 Evinrude Sportwin 10hp (SN: 10302E) I've noticed a throttle issue.


I replaced the ignition coils just before noticing this. The issue is that when my hand is on the throttle lever/arm and I turn it all the way to the LEFT (WoT) the throttle roller is only traveling about an inch or so down the throttle CAM. It makes it just barely past the black notch mark on the cam. The carb butterfly itself seems to just barely open. (Maybe you can see in the video).


At WoT like this I seem to reach about half of the max RPMs. I've tried this in all gears and it does not make a difference how far I can throttle it.


I did notice that the throttle butterfly linkage that connects all the way to the roller has some pins that aren't "tight" against other linkages. They have just the slightest amount of give before engaging.. but this is not accountable for the amount of throttle I'm missing. I know this just by simply pressing down on the throttle roller with my finger to reach higher RPMs.


So that's basically my issue! Logic tells me that I need that carb throttle roller needs to be adjusted in some way to move further up the cam.. or maybe the cam needs adjusted to be closer to the roller? Are either of these things possible though?


Let me know what you guys think I should do along with some instructions, if you'd be so kind! I'm a very novice mechanic and only know so much but I can follow direction well! Thank you so much!


Here's a video that I tried to capture showing the issue:


(The video starts with the throttle at WoT and you can see that as I give it less throttle it starts to starve for gasoline) does this look like the normal length the roller cam should travel?:


https://youtu.be/43DMjHe77Xs
 
It has the shift lock that may need adjusting or the gearbox was not installed correctly. You can check the timing with a timing light. On the side of the points plate is two marks and the flywheel has two marks 180 out. Connect the light to any 12 volt battery and check both spark plug wires when running the single mark on the flywheel must be inbetween the two marks on the plate. On the side of the engine with the shift lever is the shift lock lever, that keeps you from going WOT in neutral. On the bottom of the lever you will see three notches the detent must be center of the three notches in all three gear positions F-N-R. To adjust engine sync if necessary there is a set screw for the lever on the throttle shaft on the carb you want the carb butterfly to just begin to open as the mark on the cam passes center of the roller. Do not take it WOT without a load on the prop you will throw a connecting rod or worse.
#1 check adjust engine sync with the engine off make sure the butterfly just begins to open as the mark on the cam passes center of roller
#2 check timing ignition timing is on point gap be sure and torque the flywheel to spec before starting.
#3 Adjust slow needle for the the carb in forward gear I prefer to on the water after running WOT for about 10 minutes.
The water pump seems to be working good is the engine coming up to normal operating temp? Put your hand on the head it should get hot enough you can hold your hand on the head for a slow count to six. You should want to pull your hand away but do not have to. The shift lock is keeping you from going WOT you need to figure out why. The most common cause is the coupler is not installed properly. Pull the little plate with two screws off you will see the coupler. The two bolts need to be center of the notch in both shift shafts.
http://leeroysramblings.com/johnson_QD.htm
 
I watched your video. The motor is not in gear. The interlock on the side of the powerhead is there to limit how far you can open the throttle in neutral or reverse. It is just doing it's job. Put it in gear and you will be able to open the throttle and blow all the water out of the tub in a heartbeat (don't do it).

It sounds fine, is not broke, and does not need fixing.
 
fdrgator said:
I watched your video. The motor is not in gear. The interlock on the side of the powerhead is there to limit how far you can open the throttle in neutral or reverse. It is just doing it's job. Put it in gear and you will be able to open the throttle and blow all the water out of the tub in a heartbeat (don't do it).

It sounds fine, is not broke, and does not need fixing.
Click to expand...


Okay so that makes sense. However, when I turn it into gear, it the prop starts to turn water but I'm still unable to advance the throttle past the point that I show in the video. Does this mean the interlock is still not letting the throttle plate advance all the way? What do you guys think? I'd post more pictures/video but I can't until I get home from work late tonight or tomorrow.
 
kimcrwbr1 said:
Like I said look at the back of the shift handle is a detent that actuates the shift lock lever. Put the gearbox in neutral and look at the detent it should be center of the middle notch in the lever. Shift into forward gear and it should be fully in the forward notch and then same in reverse.
http://www.marineengine.com/newparts/part_details.php?pnum=OMC0303921
Click to expand...


Okay guys so last night I grabbed a quick video of the entire throttle process as well as took a look at the shift bar to see if the motor being in gear would change anything. I've now noticed something new.. the throttle plate does not advance regardless of what gear the shifter is in. It doesn't even go far enough to reach the shift stopper (when it's in neutral) as you can see in the video.

when I'm turning the throttle in the video I'm advancing it all the way to the left (more throttle) and then all the way to the right (no throttle).

From what I can see, it appears that the issue may actually be INSIDE my tiller throttle handle? Towards the end of the video I take a video display the gear movement in the tiller handle and you can see the cogs not advancing all the way. Let me know what you guys think!

Video: https://youtu.be/hkPZx9MRDrQ
 
Take a look at my most recent reply on the other forum where you asked this same question.

(F_R over there)
 
Last edited:
Disconnect the points plate and see if it moves smooth the full range in forward gear then work your way back to the twist grip. Sounds like it is binding up top somewhere?
 
Im sorry for your engine you need to loosen the two screws that holds the throttle cam on the points plate line up the mark center of the roller and then tighten the cam bolts. You can get that adjustment exact using a alligator clip with a wire just clip it on the throttle shaft and as you advance the timing the wire should move when the line passes center of the roller.
 
racerone said:
Motor has to in gear to get full throttle travel.
Click to expand...


Hey guys!

I disconnected the small silver clip from the throttle rod that connects it to the mag plate swing arm. I then tried to rotate the mag plate while the motor was in forward gear.. to my disappointment the problem still exists.. I cannot advance the mag plate any further than before. So it's definitely not the tiller handle/throttle I did try turning it "Extra" hard to see if it budges at all and for a moment it did begin to move slightly.. I immediately stopped doing this to prevent any possible damage. I also took apart the tiller handle and everything seemed fine in there so that's not the issue.

What do you think this means? At this point, I'm frustrated and have no idea what could be holding the mag plate up. Could I have done something wrong when reassembling the mag plate after replacing the coils? I did make sure that the wires were out of the way and tucked underneath the coils as best I could before putting the top piece of the magneto back on. Is it possible that they slipped back in the way? It would still surprise me that a small wire like that would cause this issue even if it was close to the shaft. Is there anything else I could have done wrong that would cause this issue?

Only have 3 more days to fix this before vacation! I hope I find the solution! Please let me know what you guys think I should do now?
 
With this information, there's no getting around it. You are going to have to pull the flywheel off again and take a looksee the find the problem. Unless you can look up from below the plate and see it banging into something.
 
fdrgator said:
With this information, there's no getting around it. You are going to have to pull the flywheel off again and take a looksee the find the problem. Unless you can look up from below the plate and see it banging into something.
Click to expand...


Okay thats what I figured. I can't see anything obviously blocking it underneath the whole thing. I did not remove the entire magneto plate when replacing the coils.. just did it with it still attached.

K here's the plan.. gotta take flywheel off and top cap of magneto off.. then check coil screws, see if there's wire getting stuck, and/Or perhaps remove bottom half of magneto plate too?

also, I didn't grease anything.. was I supposed to? Or do you mean the little oiler pad for the magneto? That's replaced too.

it couldn't be anything down the shaft right? Because otherwise the propeller wouldn't spin at all right?

let me know if you guys think of anything else I should check with the flywheel off! Thank you!
 
First off you did not install the coils properly. You must remove the plate, coils and wires then clean the friction points up good with acetone. Taker note of the #1 wire has a metal band for the top cylinder. push the wire fully into the coil and then slide the boot up tight then install the coil. Pull the mount bracket and ring and clean them as well. Use a high quality lithiun marine grease and grease the ring and plate and get the screws for the bracket nice and tight. Put it back together and adjust engine sync. You want the carb to just begin to open as the line on the throttle cam passes center of the roller. Make sure the points are exactly .020. Tighen the flywheel nut to spec and go fishing. It should take you about two hours if you milk it.
 
Chadbud said:
Hi guys! I'm starting a new thread for this issue as I need to have this fixed by my vacation next week so quick advice is essential to me! Thank you in advance to those that take the time to help me with this!




So after doing a tune up on my 1963 Evinrude Sportwin 10hp (SN: 10302E) I've noticed a throttle issue.


I replaced the ignition coils just before noticing this. The issue is that when my hand is on the throttle lever/arm and I turn it all the way to the LEFT (WoT) the throttle roller is only traveling about an inch or so down the throttle CAM. It makes it just barely past the black notch mark on the cam. The carb butterfly itself seems to just barely open. (Maybe you can see in the video).


At WoT like this I seem to reach about half of the max RPMs. I've tried this in all gears and it does not make a difference how far I can throttle it.


I did notice that the throttle butterfly linkage that connects all the way to the roller has some pins that aren't "tight" against other linkages. They have just the slightest amount of give before engaging.. but this is not accountable for the amount of throttle I'm missing. I know this just by simply pressing down on the throttle roller with my finger to reach higher RPMs.


So that's basically my issue! Logic tells me that I need that carb throttle roller needs to be adjusted in some way to move further up the cam.. or maybe the cam needs adjusted to be closer to the roller? Are either of these things possible though?


Let me know what you guys think I should do along with some instructions, if you'd be so kind! I'm a very novice mechanic and only know so much but I can follow direction well! Thank you so much!


Here's a video that I tried to capture showing the issue:


(The video starts with the throttle at WoT and you can see that as I give it less throttle it starts to starve for gasoline) does this look like the normal length the roller cam should travel?:


Click to expand...
Chadbud said:
Hi guys! I'm starting a new thread for this issue as I need to have this fixed by my vacation next week so quick advice is essential to me! Thank you in advance to those that take the time to help me with this!




So after doing a tune up on my 1963 Evinrude Sportwin 10hp (SN: 10302E) I've noticed a throttle issue.


I replaced the ignition coils just before noticing this. The issue is that when my hand is on the throttle lever/arm and I turn it all the way to the LEFT (WoT) the throttle roller is only traveling about an inch or so down the throttle CAM. It makes it just barely past the black notch mark on the cam. The carb butterfly itself seems to just barely open. (Maybe you can see in the video).


At WoT like this I seem to reach about half of the max RPMs. I've tried this in all gears and it does not make a difference how far I can throttle it.


I did notice that the throttle butterfly linkage that connects all the way to the roller has some pins that aren't "tight" against other linkages. They have just the slightest amount of give before engaging.. but this is not accountable for the amount of throttle I'm missing. I know this just by simply pressing down on the throttle roller with my finger to reach higher RPMs.


So that's basically my issue! Logic tells me that I need that carb throttle roller needs to be adjusted in some way to move further up the cam.. or maybe the cam needs adjusted to be closer to the roller? Are either of these things possible though?


Let me know what you guys think I should do along with some instructions, if you'd be so kind! I'm a very novice mechanic and only know so much but I can follow direction well! Thank you so much!


Here's a video that I tried to capture showing the issue:


(The video starts with the throttle at WoT and you can see that as I give it less throttle it starts to starve for gasoline) does this look like the normal length the roller cam should travel?:


Click to expand...
Hi Chad, I found your post here
Chadbud said:
Hi guys! I'm starting a new thread for this issue as I need to have this fixed by my vacation next week so quick advice is essential to me! Thank you in advance to those that take the time to help me with this!




So after doing a tune up on my 1963 Evinrude Sportwin 10hp (SN: 10302E) I've noticed a throttle issue.


I replaced the ignition coils just before noticing this. The issue is that when my hand is on the throttle lever/arm and I turn it all the way to the LEFT (WoT) the throttle roller is only traveling about an inch or so down the throttle CAM. It makes it just barely past the black notch mark on the cam. The carb butterfly itself seems to just barely open. (Maybe you can see in the video).


At WoT like this I seem to reach about half of the max RPMs. I've tried this in all gears and it does not make a difference how far I can throttle it.


I did notice that the throttle butterfly linkage that connects all the way to the roller has some pins that aren't "tight" against other linkages. They have just the slightest amount of give before engaging.. but this is not accountable for the amount of throttle I'm missing. I know this just by simply pressing down on the throttle roller with my finger to reach higher RPMs.


So that's basically my issue! Logic tells me that I need that carb throttle roller needs to be adjusted in some way to move further up the cam.. or maybe the cam needs adjusted to be closer to the roller? Are either of these things possible though?


Let me know what you guys think I should do along with some instructions, if you'd be so kind! I'm a very novice mechanic and only know so much but I can follow direction well! Thank you so much!


Here's a video that I tried to capture showing the issue:


(The video starts with the throttle at WoT and you can see that as I give it less throttle it starts to starve for gasoline) does this look like the normal length the roller cam should travel?:


Click to expand...
Hi Chad, I found your post here 7 years to late for your vacation. I solved the problem. I had the same problem that you have with not being able to turn the throttle past half throttle. After reading all the replies you got I did some digging of my own, I found that the armature plate mounting screw was a little too long and apparently interfering with armature plate support below. To fix this problem I added two washer below the head of the screw and now I can go to full throttle. (see attached photo) Hopefully you still have the motor and can use it on your next vacation.
 

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racerone said:
Screws holding the coils down too long ?----Aluminum collar under the brass collar upside down ?
Click to expand...
Wrong size screws holding armature plate.,had issue with mine where the holes were incorrectly lined up with plate.long screws in shot hole.bound plate up.couldnt move much by hand
 
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