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engines cutting - out #8308304 12/07/12 01:51 PM
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u-luckydawg Offline OP
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I was wondering if anyone could give me a few pointer to fix a 84' Johnson 75hp outboard , it just started to happen alot more frequently.
I was driving normal on plane at it seem that 2 out of 3 engine would cut- out, and if i shut off the engine wait for 10-15 min and it would plane for a minute and cut out again.
Any tips on this problem ???. Thanks hmmm

Re: engines cutting - out [Re: u-luckydawg] #8309084 12/07/12 05:15 PM
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gary purdy Offline
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Fuel supply-delivery problem


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Re: engines cutting - out [Re: gary purdy] #8309975 12/07/12 09:21 PM
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u-luckydawg Offline OP
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I have changed the fuel line to engine and new bulb, replaced the gas, changed fuel filter and the problem still there. why is it certain days the engine run for hours before couples cylinder cut-out, some days it would be 10-15 min after running ??? hmmm

Re: engines cutting - out [Re: u-luckydawg] #8310333 12/07/12 10:13 PM
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If the cylinders are cutting out,have you changed your plug wires and plugs,any other things to do with the firing system? If its int. like that it could be a high posiblity that there is something that is causing it not to get spark. Gary Purdy would prob. be your man on this one, are try Martin Pro outdoors.


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Re: engines cutting - out [Re: TITANIUM-BACK] #8311583 12/08/12 04:28 AM
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u-luckydawg Offline OP
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Thanks T-B . Do you have the no. for Gary Purdy ?.

Re: engines cutting - out [Re: u-luckydawg] #8311614 12/08/12 04:39 AM
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No I dont,but look under the boats and motor section and he has commented on some other stuff, or I think there is a search on here up top where you could search his name. Sorry for not having the number.


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Re: engines cutting - out [Re: u-luckydawg] #8313147 12/08/12 11:34 PM
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MyWifeHatesFishing Offline
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Might look at the carbs. try to tune the high speed adjustment screw on the carb.

Re: engines cutting - out [Re: MyWifeHatesFishing] #8316017 12/09/12 10:19 PM
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u-luckydawg Offline OP
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Originally Posted By: MyWifeHatesFishing
Might look at the carbs. try to tune the high speed adjustment screw on the carb.



What does the high speed screw do ???
The weird thing about the motor is sometimes it will run for 2-3 hours without any problem and other time it just get on plane for 2-3 minutes and seem like 2 0f 3 cylinders cut-out. Maybe i need a Priest to do Exorcist on that motor ??? nuts

Re: engines cutting - out [Re: TITANIUM-BACK] #8316063 12/09/12 10:31 PM
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u-luckydawg Offline OP
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Thanks T.B. , i was be able to pm Gurdy , and he gave me a good tip to start. Seem like the engine was starving for fuel, i need to check all the fuel connection, because i see a small gas pool collected in the engine housing. thumb

Re: engines cutting - out [Re: u-luckydawg] #8323928 12/11/12 09:01 PM
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Sangelle Offline
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Try replacing the plugs. If that doesn't stop the problem I would check the coils next.sometimes if coil has a crack or is starting to go bad it will do that as it gets hot.

Re: engines cutting - out [Re: u-luckydawg] #8327534 12/12/12 05:08 PM
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txbassnaholic Offline
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Had a friend that had the same problem. He spent about 4k chasing this problem. finally found out the top two cylinders on his motor were overheating. a piece of gasket, (read rubber hose) had moved in the block that routes the water around the cylinders. it actually blocked the water flow. long story short, he opted for a new motor...have someone do a temp check on each cylinder to eliminate this problem for you... good luck

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