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I have a engine on a jhon boat its a jhonson sea man 1 to 2 hp 1970-1990 and it runs good for about a half hour then it cuts off and still will run but not for long is it 2 cycle or do i need to put oil in it if so where

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Mix 16 oz ooutboard motor oil in the gas appox 5 gals, 50 to 1 ratio If you run it with out oil in gas you may have burned up the piston, take a compression test you should have 80 to 100 lbs Jim F

Posted on Jun 19, 2009


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I have two Evinrude 200HP.2 stroke engines on my boat. I have 1056 hrs on these engines should I be considering changing these engines. A J Moore

new models have more torque and are more economical to run and are 4 strokes ( 2 strokes are now ******* to sell from dealers )
That gives you advantages over the 2 stroke versions
However depending on your financial situation, having the sacrificial plates replaced, a compression test done , and a full service on the fuel system may give you more hours of reliable operation
Talk it over with reputable dealers as there are deals that can be made and possible trade-in offers that can be enticing

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Looking to repower 1997 Four Winns bowrider with newer outboard engine. What max HP is boat rated for? Found Yamaha 150 XB 2016 for a good price . Will boat work with a 25 inch shaft? Thanks,Kathy

there should be a manufacturers plate attached to the hull of the boat with a number of passengers it can carry and the max hp motor allowed to be fitted
talk with boat shops as they will know the approximate hp for each make of boat and length
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Ive got a 110 jhonson.on land it runs great.when i put it in the water it dies when i attempt to put in gear and will not run when trying to throttle up

It sounds like you have a pieces of dirt in one of the carburetor jets. When you load the engine it can't get enough fuel to stay running and stalls out.

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My 1992 4.3l volvo boat engine has spark and fuel but wont run

I had this issue on my 1988 Sea Ray 4L. Spark may be too weak if your boat has old school points and condenser - gently clean the points contact surface with fine emory sandpaper - see if this works. Otherwise back to basics- Have you checked spark timing? Compression? If those are good would suspect fuel flow ain't what it seems. Good Luck!

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My 1985 4-winns mercruiser 4 cylinder boat runs great for twenty minutes to a half hour then the motor misses and stalls out. After about thirty minutes the boat starts back up and runs great for anot

Check the torque on the head bolts. I can't tell you what it is, been a long time. If they are good, run it till it dies. Then check for spark at the plugs or coil/s. No spark replace the coil/s. My guess would be coils. But I have seen the head loosen up.

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I have a 2000 suzuki df 15 hp 4 stroke and when idleing it runs perfect when you give it half throttle in gear it dies ,ive replaced the diaphram in fuel pump and cleaned and retuned carb it still doe

the culprit is the CDI is receiving a signal from the coolant temperature switch indicating the engine is overheating and has switched the ignition over to LIMP HOME MODE.
because the engine is cooled by lake/sea water the thermostats brass plunger becomes gummed up with salt / moss / algae buildup preventing it from opening fully or even opening at all

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No fire to the plugs looks like the man owned it befor me put the 100 hp evinrude on it it should of been a 175 jhonson..jhonson plug has 2 extra wires.. can you please help

You will need to compare both engines wiring diagram. These engines would bolt to the same intermediate housing over an astonishing wide range of powerheads.

You may have completely different ignitions.

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Cuts out

15 minutes is a reasonable time for a low cost RC boat. Is it cutting out because of low battery voltage?

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Engine won't start after running at cruise for 2 hours.

verifica la precion de gasolina es el regulador de precion.

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Hard start wont run more than a few minutes

sounds like the air bypass valve may be stuck ,try pulling off a small vaccum line. the valve is used instead of a choke plate. when engine is cold it bleeds air around the throttle plate raising the idle.

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