johnson hard to restart after being shut down

[weekendfisher]

Hi,
Just wondering if anyone can help out i have a 55 HP johnson 95 model i have recently had the Carbs re built and it starts first go and runs perfect but it is hard to restart after it has been off for between 1-2 hours usually takes a few goes to get started is there a different procedure to follow when I start from cold I just choke it a bit crank and it starts.
Thanks.

 

[jonesg]

Re: johnson hard to restart after being shut down

Pump the bulb first.

 

[jtexas]

Re: johnson hard to restart after being shut down

Does it help if you lift the hi-idle lever about half-way, without choking?

My experience, the most common cause of a hard warm start is flooding -- carb float valves let a little fuel seep past when you stop. If your rebuild included new float valve needles *and* seats, then I'd re-check the float height. If you didn't replace those items, that's where I'd start.

If the bulb goes soft after just a couple hours, you got a fuel line problem.

 

[weekendfisher]

Re: johnson hard to restart after being shut down

Thanks Guys
The flots were replaced in the rebuild .
I will try without priming the bulb again it doesn't go soft but it is not as hard as it has been.
I think you may be right about it flooding a little i will try starting it with the idle up lever half way and not priming the bulb and see how that goes.
Thanks

 

[jonesg]

Re: johnson hard to restart after being shut down

If its heatsoak , pumping the bulb will fill the bowls with cold fresh fuel.

 

[jz78817]

Re: johnson hard to restart after being shut down

we've found a similar problem on my friend's boat with an Evinrude 115... we've pretty much determined it's flooding after being shut down, 'cos in order to restart it one of us has to disconnect the fuel line, crank until it starts, then reconnect the fuel line and we're on our merry way. the carbs were recently rebuilt with new floats, valve needle and seats.

one thing I remember is that the trim doesn't work properly on this boat yet, I'm wondering if it's due to the engine always being angled/trimmed down. Meaning, the angle of the engine is holding the carbs in a position where the float doesn't seat down to close the needle...

 

[brichbk]

Re: johnson hard to restart after being shut down

I had a similar problem with my 1977 70HP Johnson. The problem was the fuel line from the gas can to the motor, the gas cap was not venting (old metal gas can) and also I was choking when trying to start the engine after it was warm.

I got a new hose, new gas can and stopped choking and now I don't have the problem anymore.

 

[jtexas]

Re: johnson hard to restart after being shut down

...the bulb ... doesn't go soft but it is not as hard as it has been.
...

After you shut off the engine the bulb might be a little less firm than when you started...but "firm" doesn't really mean hard like a baseball, or even a tennis ball; it just means that squeezing the bulb doesn't push any gasoline, because the float valves are shut.

If you can fish all day without having to prime the line, then you're maintaining plenty of pressure.

[note to jz: I don't think engine angle affects properly functioning float valves, at least not at any angle that puts the prop in the water. Once I experimented by tilting the motor while it was running on the muffs. It was about 98% fully up before gas started running out the carbs. I shut it off at that point, don't know if it would have died. Besides which, if that were the case, fuel would pour out our carbs whenever we tilted the motor to fish a stumpfield or park on the beach. Could be possible with improperly set valves, though.]