87 50HP johnson need some help

[beto]

Will a bad water pump cause it to sputter at low speeds? At high speed it seems to kick in and water flow looks fine.

 

[smallboatlover]

Re: 87 50HP johnson need some help

i have the same problem with my motor only 2 years apart i got a 85. 50 hp i was told they always run rough when low speeds but when running it goes great

 

[Nathan k]

Re: 87 50HP johnson need some help

when did you replace the impeller?
also it would need minimal cooling anyway at a low speed

 

[jigngrub]

Re: 87 50HP johnson need some help

Do you know when the last time your impeller (water pump) was changed? Puting a new one in won't hurt a thing, or at least inspect your old one. Better yet, if your old one looks ok just save it for a spare and go ahead and put the new one in.

You can get help on how to change it in the Johnson engine repair forum.

 

[beto]

Re: 87 50HP johnson need some help

I bought and have had the boat in the water since April. I had some issues in the with the fuel system, but have since replace all the fuel system including removing the vro pump and modifieing a bracket for a regular fuel pump. It had been running great the last three or so months till last Sat. I was heading out full throttle and it just startd sputtering. I noticed it was not spitting the same amount of water that it usually did. So I figured it could be the pump. At full throttle it sputters a little but then gos and water seems to flow right. At low speeds pulling in to my slip or just crusing speed it sputters and water does not flow right.



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