1990 Evinrude 60 Rough Idle and Bogging

[Jkelley429]

i had bogging recently, and had at least one clogged high speed jet, cleaned and clear, now good throttle, three other adjustments i made was float level gauge to set correctly( $20 tool), float drop set with in range(1 1/18 to 1 5/8), and tweaked the spring clip that holds the float needle to the float arm, no gap, tight against float arm, this is on a 84" 70 hp

I'll be sure to triple check the high speeds before reinstalling, that seems to be a common issue. Thanks. Now that you mention it, I havent checked the float drop.

What happens when you pump the ball on the fuel line? Is the VRO bypassed or removed completely? Did you try going more on the low speed screws? My 70 likes 4.25 turns out.

No change when pumping the primer bulb. VRO was just bypassed when I bought it, I have since replaced with a non-VRO pump. I have tried going further on the low speeds, once you get beyond 3 turns on mine it stalls.

I'm wondering what the "intermediate orifice" on the front of the carb is responsible for. As I understand, it draws air into the emulsion tube in order to atomize the fuel going into the venturi, is this correct?

 

[flyingscott]

I'll be sure to triple check the high speeds before reinstalling, that seems to be a common issue. Thanks. Now that you mention it, I havent checked the float drop.


No change when pumping the primer bulb. VRO was just bypassed when I bought it, I have since replaced with a non-VRO pump. I have tried going further on the low speeds, once you get beyond 3 turns on mine it stalls.

I'm wondering what the "intermediate orifice" on the front of the carb is responsible for. As I understand, it draws air into the emulsion tube in order to atomize the fuel going into the venturi, is this correct?

Did you use the Pulse limiter?

 

[racerone]

That spring clip is there to pull the float needle down should it be sticky.----I have never tweaked one of those !

 

[Jkelley429]

Did you use the Pulse limiter?

I left the pulse limiter from the VRO pump in place. I see there's a few posts regarding that but no clear answer. What is the verdict on it?

 

[racerone]

The pulse limiter is but a ----FLOW FUSE -----For the VRO pump.----It is not needed / used for a conventional pump !------Have you considered removing the cylinder head ?

 

[Jkelley429]

The pulse limiter is but a ----FLOW FUSE -----For the VRO pump.----It is not needed / used for a conventional pump !------Have you considered removing the cylinder head ?

Could the pulse limiter be causing the issue I'm having, maybe in conjunction with the missing thermostat?

Removing the head is on my list of things to check next if I can't figure it out otherwise. What exactly would I be looking for? Compression is good so I dont expect there to be anything obvious.

 

[flyingscott]

If you have a standard fuel pump you need to get rid if the pulse limiter and screw a nipple in there.

 

[racerone]

Some will argue.---I do not consider 100 PSI to be " good compression " ----So I say again --" head gaskets are cheap "

 

[Jkelley429]

Some will argue.---I do not consider 100 PSI to be " good compression " ----So I say again --" head gaskets are cheap "

I still plan to pull the head at some point. What should I be looking for? Just to clarify, the compression is actually 115-120 on all cylinders. The gauge I was using previously was faulty.

 

[racerone]

Well---- if you had a clogged high speed jet there would be no gasoline and no oil going into one crankcase / cylinder !!----Gasoline does a lot of cooling when it evaporates too.-----It is up to you to do the trouble shooting !

 

[ct1762@gmail.com]

could it be piston skirts are shot, making it impossible for fuel/air in the correct amount to be drawn in? if the fuel pump both in the OMS and conventional are working and not leaking, thats the only other thing left here, save for not enough float drop. as you know, compression is only 50% of the intake/cumbustion process. the other being vacuum. head is super easy to take off on these without removing powerhead!