problem 1967 evinrude`

[shipwreck]

1967 EVINRUDE SPORT FOUR 60 HP MODEL 60733

I WRITE ABOUT HEAVY SHAKE OF THE MOTOR, IN LAST WRIT UP.
I SINCE, HAVE CORRECT MANY PROBLEMS
REPLACED CARB GASKET , TURNED DOWN LOW SPEED NEEDLES(adjusted right)
and cleaned up plugs and disturb, points set and gap , lubed Bendix spiral shaft, note this helped the boat start much easy, replaced pack or jam nuts for low speed needles , this made noticeable difference in tightness of needle when be turned, before vary loose. Cleaned all +, - connect connections. pressure checked 90 all cylinders cold motor / not warmed up ...ya 90 psi...

So after all that, run the motor ...
The motor still has a heavy shake will shake to starboard side.

note , when i turn the flywheel by hand clock wise , 180 degrees the is vary little resistance and the other 180 degrees vary stiff.
i work on the thought that all piston are cycled in 360 degree turn of flywheel ?
Is this normal?

The same thing happens when motor's running , sounds good for a couple seconds then drops out like dieing (can keep up) and comes back.

my thoughts: on bad engine running
bad spark wires
bad spark ground ..they have heil coils installed
bad point

I am going to pull all plugs and check to make sure the are all cylinders are getting fuel mix. That should kind help rule carb no fuel problem.

Can lower unit be removed and the engine ran with damage if hook water up to inlet tube?

 

[Evinrude Boater]

Re: problem 1967 evinrude`

Maybe you have a broken motor mount

 

[shipwreck]

Re: problem 1967 evinrude`

Good Thinking

 

[shipwreck]

Re: problem 1967 evinrude`

I Have Been Battling To Just Get The Boat To Start.
It Has Been Fuel Issue, I Found Bad Fuel Hose To The Fuel Pump.
I Got It Started To Night , Return Back To The First Problem I Had Post Before Has Become Clearer.

It Is Backfiring Through Lower Exhaust Port Or The Water Outlet Pipe Near The Prop (located Just Above Prop...i Am Not Sure If This Is Exhaust Or Water Outlet Port. That When The Engine Slow Down Then Surge Back Up.

The Run On Muffs At Idle For A Little While The Lower Got Pretty Hot In Neutral , Slide In Forward And Reverse Great With A Backfire And Shake.

THE BACKFIRE IS WHAT IS MAKE JERK , NOW WHAT is CAUSING IT ?

 

[F_R]

Re: problem 1967 evinrude`

Spark plug wires on wrong plugs?

 

[shipwreck]

Re: problem 1967 evinrude`

checked that one , i wish it was the problem!

 

[shipwreck]

Re: problem 1967 evinrude`

dose i rebuilt carb need to be primed , or do you just put on and go?

 

[steelespike]

Re: problem 1967 evinrude`

Pull one plug wire at a time ground it and run motor note any difference.
May have a bad distributor cap or rotor.Parts for some of these V4 distribtors can be difficult to find and expensive.Check for worn,cracked or rubbing plug wires.Plug wires may be screwed into the cap don't attempt to just pull out.
Maybe a bent drive shaft.Pull the lower unit and turn motor by hand note 360 degree rotation. Turn drive shaft.

 

[Evinrude Boater]

Re: problem 1967 evinrude`

The engine will shudder or jerk when adjusting the slow speed needles. It's at that point that you turn the needle out a quarter turn then do the other one. Did you adjust the slow speed needles?

 

[shipwreck]

Re: problem 1967 evinrude`

yes i did exact what you said, it run good and then start the problem

 

[shipwreck]

Re: problem 1967 evinrude`

i replace all wires and boots ,plus screw end all new
check with contitunity meter , all came out good.
checked lower turned good.


could bad point breaker cause this ?

 

[steelespike]

Re: problem 1967 evinrude`

how are the cap and rotor?Check both for carbon tracks indicating a crack.
Back firing is sometimes caused by a lean condition.

 

[shipwreck]

Re: problem 1967 evinrude`

Checked cap and rotor good shape.
What else could cause this type of backfire
It dose not backfire through exhaust port below engine only at low unit exit port, That only happens when i adjust low speed needles.

I am going to take one plug off at time and check engine reaction.
If can't find problem there, i will readjust needles.

thanks to all!

 

[Evinrude Boater]

Re: problem 1967 evinrude`

A back fire comes out the carburetor. I'm not sure if that's possible with a reed valve 2-stroke. You might be experiencing a mis-fire where one of the cylinders doesn't fire causing the engine to shake for a second. My car did that when one of the plug wires was dangling on the spark plug.
If you can get four spark testers, you can put them on all four spark plugs and watch the sparks and see what happens when your engine gets the shakes

 

[Kettler]

Re: problem 1967 evinrude`

Backfires are a result of to lean a fuel air mixture.

 

[Evinrude Boater]

Re: problem 1967 evinrude`

Yes, when you turn the low speed needles clock-wise you're adjusting leaner and it will get to a point where it coughs, sputters, jerls, shakes....any of those symptoms. That's when you turn the needles back a quarter turn.

Shipwreck, are you seeing flames or smoke coming out somewhere during the backfire or does the engine just hesitate for a second?