Down motor

[Balawson41]

I have a 1985 20hp evinrude 2 stroke has fire but won’t start period sprayed starter fluid in cylinders won’t even hit checked compression top cylinder reads 95psi and second cylinder reads 98psi what could be the reason it won’t start plugs have been changed and gapped 0.30

 

[racerone]

Check flywheel key.

 

[Scott Danforth]

Did you check for spark?

Also, never use ether on a 2-cycle motor

 

[Balawson41]

Did you check for spark?

Also, never use ether on a 2-cycle motor

It has bright blue spark on both plugs

 

[Balawson41]

It has bright blue spark on both plugs

I didn’t know u didn’t suppose to use starting fluid I only sprayed it once but it didn’t work anyways lol

 

[Balawson41]

It has bright blue spark on both plugs

Guess it would be better to use mixed gas in a spray bottle

 

[Balawson41]

It has bright blue spark on both plugs

Check flywheel key.

Is the key also used for the timing cause if u crank it for 4-5 seconds it back fire thru the exhaust

 

[racerone]

The key is the timing control !!

 

[Balawson41]

The key is the timing control !!

I’ll pull the flywheel after work tomorrow and check it any suggestions on a good place to order boat motor parts from

 

[racerone]

If sheared install a factory replacement key.-----Install with tapers clean and dry.-----Torque to the correct value.

 

[Balawson41]

If sheared install a factory replacement key.-----Install with tapers clean and dry.-----Torque to the correct value.

Ok thanks for the info I’ll tare in to that tomorrow really appreciate the info I’ll let ya know what I find again thanks a bundle

 

[Bondo]

Ayuh,..... Welcome Aboard,..... At under 100 psi compression, it's just plain worn out,.....

 

[Balawson41]

Ayuh,..... Welcome Aboard,..... At under 100 psi compression, it's just plain worn out,.....

A normal compression on a 2stroke 20hp is around 110-

Ayuh,..... Welcome Aboard,..... At under 100 psi compression, it's just plain worn out,.....

Normal compression is 110-130 but seen plenty motors run perfect in the low 90’s upper 80’s but could still be the problem hoping not though lol it was running great till it just died out

 

[Balawson41]

If sheared install a factory replacement key.-----Install with tapers clean and dry.-----Torque to the correct value.

I pulled the fly wheel and you was right sheared the key steel replacing it now let ya know if that does it by the way would you know the torque on that but I was thinking around 45 pounds

 

[racerone]

I think 45 FT-LBs is not enough.----Someone on here will have the value.--No manual handy today.