1960 Evinrude Fastwin Stutter

[JohnnyGuy]

I did a decent amount of work to this motor two winters ago (Feb 2021; New coils, wires, points cleaned and timed, plugs, carb kit, gearcase reseal) Just got the opportunity today to get it on the back of a boat for a test and never left the dock. It was stuttering pretty good. Based on the fact that it would run on choke I'm leaning towards a carb issue. I'm going to pop it out and stick it back in the ultrasonic cleaner and see if that helps. I'll check the sparks on a gap tester to just to make sure that they are both producing spark.

A quick video of it is available here:

If anyone has any other thoughts I'm all ears. I could use this motor in a few weeks time as a second motor for an upcoming vacation.

 

[racerone]

Open low speed mixture 1/2 turn and test run.

 

[JohnnyGuy]

Open low speed mixture 1/2 turn and test run.

I played around with it quite extensively. Started 1.5 turns out from lightly seated. Was worse when turning in. Turning out didn't seem to make much difference

 

[racerone]

There is a threaded bushing inside the carburetor.-----The low speed needle threads into that.----If thread is bad then low speed needle may not move in and out.-----Time to redo the carburetor work.-----Or throttle plate is open too early.-----Throttle plate must be closed for proper idle.

 

[JohnnyGuy]

There is a threaded bushing inside the carburetor.-----The low speed needle threads into that.----If thread is bad then low speed needle may not move in and out.-----Time to redo the carburetor work.-----Or throttle plate is open too early.-----Throttle plate must be closed for proper idle.

Thanks I'll double check those when I pull the carb (hopefully today).

 

[JohnnyGuy]

Also, can anyone confirm how to tighten up the throttle on these motors? Its a little loose and tends to throttle down from the throttle stop when starting.

 

[F_R]

The new coils may be dragging on the flywheel magnets, causing the throttle to back off. A simple matter of adjustment.
There also is a tapered friction block in the twist grip (or supposed to be)

That motor is lean sneezing. Lack of fuel, carb synchronization, etc.

 

[JohnnyGuy]

The new coils may be dragging on the flywheel magnets, causing the throttle to back off. A simple matter of adjustment.
There also is a tapered friction block in the twist grip (or supposed to be)

That motor is lean sneezing. Lack of fuel, carb synchronization, etc.

Thanks F_R. I don't feel like the coils are dragging/rubbing.

I did pop the cowl and I missed reconnecting the linkage between the cam follower and the throttle plate when I reassembled it.
Even still, when in neutral and on the throttle stop the throttle plate is barely open.

I have the carb synced so that the line on the cam makes contact with the roller. It does take the tiniest bit more throttle to see the linkage start to move.

 

[JohnnyGuy]

This is the link that I didn't have connected to the cam follower.



This is a quick video I took of my current synchronization:

 

[JohnnyGuy]

Update:

I disassembled the carburetor again and put it back into the ultrasonic cleaner. When I disassembled this is what I found in the bowl:

I didn't replace the fuel lines originally nor did I take apart the fuel filter on the port side of the motor and clean it.

I replaced all the fuel lines and cleaned the filter housing (in/out ports and the bowl).

I then did a quick barrel run:

Still needs some tuning on the lake but I'm feeling optimistic about it.

Thanks for the comments so far. Much appreciated.

 

[saltchuckmatt]

Update:

I disassembled the carburetor again and put it back into the ultrasonic cleaner. When I disassembled this is what I found in the bowl:

I didn't replace the fuel lines originally nor did I take apart the fuel filter on the port side of the motor and clean it.

I replaced all the fuel lines and cleaned the filter housing (in/out ports and the bowl).

I then did a quick barrel run:

Still needs some tuning on the lake but I'm feeling optimistic about it.

Thanks for the comments so far. Much appreciated.

 

[saltchuckmatt]

Hard to tell exactly what we were looking at but it appears to be water.

 

[airshot]

Yep....when you decide to clean out the carb, everything connected to it must be cleaned as well!! We have all had to learn that a thorough job is the only way to go..

 

[JohnnyGuy]

Yep....when you decide to clean out the carb, everything connected to it must be cleaned as well!! We have all had to learn that a thorough job is the only way to go..

Yup. Was definitely disappointed with myself after the realization.

 

[JohnnyGuy]

Well it was a 3.5hr drive for our holidays but got it to the lake to give it a go and it wouldn't start no matter what. Didn't change anything between the barrel run and the lake.
Was definitely getting gas. Checked spark and THOUGHT I had spark on top, didn't on the bottom. Didn't have too many tools with me to mess with it too much.
Anyways I got it on the stand today and popped the flywheel to find the Woodruff key sheared? This is my first experience with this issue. I always look up the value and torque the flywheel prior to putting them back on.
Looking at the taper it's smooth but had some discolouration on it. Maybe a very light sand or acetone?
Also the breaker cam was extremely difficult to remove and looks like someone else removed before judging by the marks on the bottom.
The key was also stuck in there. Had to tap the bottom of it lightly with a punch in order to get it out.
Being the first time this has happened to me, just wondering what I should double check prior to trying a new key.
Appreciate the input in advance.

Sheared Key photos:

 

[saltchuckmatt]

Well it was a 3.5hr drive for our holidays but got it to the lake to give it a go and it wouldn't start no matter what. Didn't change anything between the barrel run and the lake.
Was definitely getting gas. Checked spark and THOUGHT I had spark on top, didn't on the bottom. Didn't have too many tools with me to mess with it too much.
Anyways I got it on the stand today and popped the flywheel to find the Woodruff key sheared? This is my first experience with this issue. I always look up the value and torque the flywheel prior to putting them back on.
Looking at the taper it's smooth but had some discolouration on it. Maybe a very light sand or acetone?
Also the breaker cam was extremely difficult to remove and looks like someone else removed before judging by the marks on the bottom.
The key was also stuck in there. Had to tap the bottom of it lightly with a punch in order to get it out.
Being the first time this has happened to me, just wondering what I should double check prior to trying a new key.
Appreciate the input in advance.

Sheared Key photos:
View attachment 369570

View attachment 369571

View attachment 369572

View attachment 369573

View attachment 369574

View attachment 369575

Yes, the crank will need to be cleaned up because most likely it got scraped up with the old key...in fact to many times and it's unfixable. There is plenty of places online stuff about how to use compounds to clean it up.

Sorry your running into so many problems.

 

[racerone]

Use valve grinding compound to clean up and match the tapers.-----Fact for you.-----The key lines it up for proper timing of magnets and breaker point opening.-----The flywheel is driven by the matching tapers.----The tapers lock when nut is torqued.-----Assemble the tapers CLEAN and DRY.

 

[racerone]

Is there a seal at the top of the crankshaft ?-----Looks like a " club fisted " individual has been in there trying to remove the seal at some time.----Joint on that collar is slightly " open " for some strange reason.----Usually that joint is not visible.

 

[JohnnyGuy]

Is there a seal at the top of the crankshaft ?-----Looks like a " club fisted " individual has been in there trying to remove the seal at some time.----Joint on that collar is slightly " open " for some strange reason.----Usually that joint is not visible.

Yeah. I don't really like it, there's some sealant goop in there. Was thinking of maybe just tearing it all apart over the winter and fixing it back up.

 

[racerone]

Is the upper crankshaft seal in there ??