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Post Options Post Options   Likes (0) Likes(0)   Quote wave warrior Quote  Post ReplyReply Direct Link To This Post Topic: Please help
    Posted: 23 Mar 2013 at 7:20pm
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Johnson 1989 225hp.
Hi guys, was out on my boat today and on the way home going bout 30knots the alarm started going off,i immediately backed off and the motor started shuddering,it would do about 12 knots like nothing was wrong,then when I go a bit faster it starts shuddering and would not go any faster than 15 knots so we limped home,any ideas on problem would be greatly appreciated!thanks guys
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Post Options Post Options   Likes (0) Likes(0)   Quote Durban Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 2013 at 9:50pm
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for the alarm to go off & stay constant bleep , a sign of over heat , the shuddering , could be one of many possible causes  , i would start with a spark tester first & then follow through  the trouble shooting process , & only getting up to 15 knots tells me you are probably not gettin spark on all the plugs , or carb problems
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Post Options Post Options   Likes (0) Likes(0)   Quote Outboard Performance Quote  Post ReplyReply Direct Link To This Post Posted: 25 Mar 2013 at 8:56am
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If you have an alarm sound, the motor will shudder at about 2500 rpm. There is a built in rev limiter when the alarm sounds to avoid doing major engine damage.
Two causes of constant alarm on your motor is 
1 - Overheat
2 - Fuel restriction. That motor has a vacuum switch fitted to fuel system.
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Post Options Post Options   Likes (0) Likes(0)   Quote wave warrior Quote  Post ReplyReply Direct Link To This Post Posted: 25 Mar 2013 at 4:38pm
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Just spoke to the guy I brought it off an yip u guys are right!overheating,it doesn't like that speed,he said it done it 2 him twice at that speed an the shuddering is a safety type thing,reckons it should b sweet as if I take it back out an stick to 20 knots,thanks for your help guys!!!
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Post Options Post Options   Likes (0) Likes(0)   Quote Jet_ski_fisher Quote  Post ReplyReply Direct Link To This Post Posted: 25 Mar 2013 at 4:49pm
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It should not do any thing at any speed. take it back and get them to fix it at there cost...if i was you i would not be using it, till it's fixed....
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Post Options Post Options   Likes (0) Likes(0)   Quote Outboard Performance Quote  Post ReplyReply Direct Link To This Post Posted: 26 Mar 2013 at 10:32am
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Worst advice I have ever heard!!!!

Get the water pump serviced and replace the thermostats. Cost you prob $300

Or you could risk it and need a 5k rebuild.... I'd go the $300 option personally.
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Post Options Post Options   Likes (0) Likes(0)   Quote Durban Quote  Post ReplyReply Direct Link To This Post Posted: 27 Mar 2013 at 6:53pm
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the word " shuddering ",  to me its not just a question of replacing water pump & thermostat ,is not going to make it go faster than the present 15 knots hes getting now i think its more than just this . 
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Post Options Post Options   Likes (0) Likes(0)   Quote Olfart Quote  Post ReplyReply Direct Link To This Post Posted: 27 Mar 2013 at 7:15pm
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For what my opinion is worth ..... I reckon OP is on the money with this one.  Better to spend the three hundy or so he recommends than to just box on and find you are faced with a massive bill later which could so easily have been avoided.  If it were me I would be asking OP for his advice as to the best mechanic in your area so you can get this job done correctly.

Semper in excreta sumus, solum profundum variat....



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Post Options Post Options   Likes (0) Likes(0)   Quote wave warrior Quote  Post ReplyReply Direct Link To This Post Posted: 29 Mar 2013 at 3:04pm
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Took the boat out for a run this morning to c if the shuddering was gone now it had cooled down,it went sweet as,will do what op said before i go out again thanks 4 your help guys much appreciated!
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