1977 70hp Evinrude flooding

[lightwood38]

Seem to be having a flooding problem after sitting for a while, motor starts first time every time when cold and purrs like a kitten. after sitting on the water for an hour or so its real hard to start.

Once its running it purrs like a kitten again, idles fine and pulls at 5600rmp no probs. Even after towing it home the other nite and hooking up the muffs it took ages to start and blew a heap of smoke when it did. Once it burned the excess fuel it run fine.

I have only had this boat out about 5 times since i bought it so maybe i just need to learn how to start it warm but it shouldn't flood that easily IMO. All fully serviced about 8 weeks ago.

Any ideas?

 

[CharlieB]

Re: 1977 70hp Evinrude flooding

Are you adjusting the motor trim to LEVEL before turning off the motor?

Sometimes this can make the difference.

The better method is to find the source of the flooding.

Adjust the trim to where it usually is when you have the problem, remove the airbox front cover. Since the boat is parked on the trailer and shut off, shift into gear and WOT, watch down the carb throats while you pump up the primer bulb.

Is any carb flooding?

Trim the motor level and repeat the test. Is any carb flooding now?

If it continues to flood then a carb cleaning with NEW kits is in order.

If trimming the motor level stops the flooding you can get by just leveling the motor before you turn it off.

 

[lightwood38]

Re: 1977 70hp Evinrude flooding

Thanks for that, no I didn't trim the motor level when i shut it down or before starting and the way I finally started it was to trim the motor all the way up, let the fuel run out and trim it all the way back down.

But the first 4 times i have had it out it was fine and started straight away no matter where I had the engine tilted, same with at home on the muffs.

The carbs were supposedly kitted with the service.

 

[Vic.S]

Re: 1977 70hp Evinrude flooding

If it really does idle smoothly it is not flooding in the sense that one of the float chamber valves is not seating.

I think maybe it's your starting procedure. It cannot flood as such while it is not running, unless you are over enthusiastic with the priming ball

After sitting on the water for a couple of hours it should start in exactly the same way as it does when cold. Pump the priming ball until you feel resistance choke and crank. No choke if its still fairly warm.

It appears to have solenoid operated flap type chokes. Ugh ... either full choke or none ... not possible to give partial choke when warm!


Will it restart again immediately if stopped when hot.

 

[lightwood38]

Re: 1977 70hp Evinrude flooding

If it really does idle smoothly it is not flooding in the sense that one of the float chamber valves is not seating.

I think maybe it's your starting procedure. It cannot flood as such while it is not running, unless you are over enthusiastic with the priming ball

After sitting on the water for a couple of hours it should start in exactly the same way as it does when cold. Pump the priming ball until you feel resistance choke and crank. No choke if its still fairly warm.

It appears to have solenoid operated flap type chokes. Ugh ... either full choke or none ... not possible to give partial choke when warm!


Will it restart again immediately if stopped when hot.

Cheers, I never touched the ball, I can start it fine 2 days after parking it and dont need to prime it.

I started it the same way as I would cold, throttle all the way up and hit the choke, it's worked fine every other time. But maybe I need to just hit the key and bring the throttle up slow and I didnt try to start it straight after but i will do next time.



How does the fuel pump work on these things, Could it be a bit of crap on the needle thats flowing out when tilted?

 

[lightwood38]

Re: 1977 70hp Evinrude flooding

Well I can't seem to replicate the problem at home, starts first time every time no matter how the motor is tilted.

 

[CharlieB]

Re: 1977 70hp Evinrude flooding

Here in the USA we have a problem sometimes with heat soaking into the carbs causing fuel boil/flooding.

Many times the solution is to idle the motor to cool it a bit after a run BEFORE shut down.

 

[tashasdaddy]

Re: 1977 70hp Evinrude flooding

if you tilt the motor when stopped, the carbs are out of level, thus the carb float is out of level, allowing fuel in. try disconnecting the fuel line before tilting.