motor losing power when throttled up?

[Jixxxer]

Well we went out boating today, all is going well for an hour or so and then the motor lost power and the hot light came on. So I stopped the boat and let it cool. STarted it up and it seemed ok until i gave some throttle and it had no power and had a jerky type feeling. It went ok at a real slow speed, its only when i gased it that it had no power what so ever. So i coasted back to the landing and pakced it up. Any one have any ideas? Its a 1999 johnson 70.<br />Thanks!

 

[OBJ]

Re: motor losing power when throttled up?

Might be a good idea to take a compression test Jixxxer....find out if any damage was done to the cylinders. Also check the plugs for any signs of water intrusion. May have popped a head gasket.

 

[Jixxxer]

Re: motor losing power when throttled up?

Well I just got it back from the mechanic. He check compression was good, he changed the water pump and plugs and gave it a "tune up". Funny thing is its worst than it was the before I brought it to him???

 

[OBJ]

Re: motor losing power when throttled up?

Worse, as in, "jerky when applying throttle"? Could need a good carb overhaul. Spark is good?

 

[artburr]

Re: motor losing power when throttled up?

Your experience with "service" is about like mine.

 

[Jixxxer]

Re: motor losing power when throttled up?

I forgot to mention that right before this happened the HOT light came on in the boat and we were hydrosliding.

 

[MCM]

Re: motor losing power when throttled up?

Hi,<br /><br />Does your motor have the S.L.O.W. feature?<br /><br />If so you may have a bad/stuck sensor!<br /><br />Just guessing.<br /><br />Mike

 

[MCM]

Re: motor losing power when throttled up?

Here's an old post, sounds a little similar to your problem.<br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=022708#000000 <br /><br /><br />Mike