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    What caused this????

    Re: What caused this???? It's ok to mix a new oversize piston with the 3 originals. The top ring let go on the piston. That's from an overheat. Either the piston was not cooled properly or ran on a lean fuel mixture (overheat.) In any event, it got hot enough to break the top ring and that...
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    89Johnson 150 Overheat

    Re: 89Johnson 150 Overheat Here is a pic of how a properly-installed deflector should be positioned.
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    performing the 2.6 gt mods on a block

    Re: performing the 2.6 gt mods on a block You can't get the factory pistons anymore-NLA. I bought some replacement Bombardier big bore 235 pistons and had a machine shop cut the skirts to match the original factory pistons. They run just great. Likely your problem will be cutting them and the...
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    79 johnson 100TLR79S 100 HP lost compression and this is piston help ?

    Re: 79 johnson 100TLR79S 100 HP lost compression and this is piston help ? Looks like the walls in the coolant chamber are separating. Like the paint inside the water passages is coming off/delaminating in a sheet. Does not look normal. I've attached a pic of what a normal block should look...
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    Performance parts for 79 135hp?

    Re: Performance parts for 79 135hp? This is a picture of a 135 block with the special 140 cutout added to the lower exhaust chest.
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    1985 235 overheat problem, need some help guys

    Re: 1985 235 overheat problem, need some help guys I am not sure from your description, but you may have meant that you pulled the head covers off the heads, and that they were clear. If that's what you did, that's a solid inspection. You have not yet said that you removed the heads, esp the...
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    confused.com thought i had 115 hp turns out its a 140 hp

    Re: confused.com thought i had 115 hp turns out its a 140 hp You have two threads going for the same engine. Best to keep all your comments on just one thread so the folks that are trying to help you can do that. It's not to your advantage to scatter your questions on two threads. It's a 78 or...
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    Johnson v4 115 hp two stroke what year ?

    Re: Johnson v4 115 hp two stroke what year ? It's either a 1978 or a 1979 140 hp Johnson. The model plate will tell you for sure. Though it's old, that engine was very desirable in it's day. If the serial/model plate is missing, look for a casting plug on the top of the block. It may be painted...
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    johnson 85ESL73M

    Re: johnson 85ESL73M The 140 hp engines started in 1977. The block was changed that year. An exhaust divider was was removed from he exhaust chest, permitting an extra 5 hp. This is a 135 block with the modification.
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    1991 Johnson V 90 overheating at idle

    Re: 1991 Johnson V 90 overheating at idle Dargel makes a great point about checking the valve body to make sure the bleed hole is open. I believe on your model, the valve body is the later design. It has a larger, single oval hole instead of the two pinholes. Anyway, check to make sure it is...
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    77 Johnson 115 won't hole shot without choke

    Re: 77 Johnson 115 won't hole shot without choke The engine is a 1973-1977. Could be a 92 cubic inch 85/100 or a 99.6 cubic inch 115. It has the belcrank shift system on it as well as the single vernatherm thermostat system. Someone has put 83 or newer carbs on it. While it may run with them...
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    Serial # 1990 Evinrude XP150 HP

    Re: Serial # 1990 Evinrude XP150 HP I'll attach a pic of the core plug from an XP block. As I recall it was around a 1985.
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    Johnson GT 150

    Re: Johnson GT 150 Not all the crossflows had serial/model numbers on the casting plug on the top of the block. The factory also stamps that information on a tag and puts it near the swivel bracket, just below the powerhead. You are looking for a special model code with an "S" added. For...
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    150 johnson-water damage #6 cylinder

    Re: 150 johnson-water damage #6 cylinder What year is this engine? Is it a crossflow or 60 degree looper? Completely different blocks. From your compression readings, I will guess it's a late 80's crossflow flatback. If so, it is possible to get water into the exhaust chest from the inner...
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    79 140 head rebuild questions - water in lower port cylinder

    Re: 79 140 head rebuild questions - water in lower port cylinder The head gasket is usually a likely suspect for failure and permitting water intrustion into the cyls. Sounds as if that may not be the case on your engine. That engine can also ingest water in the (usually lower) cyls from leaky...
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    Correct height on the jackplate?

    Re: Correct height on the jackplate? Work on your setup. At 5800, that's not bad. This big bore looper will still make good hp up to 6000 rpm-it's max factory rpm range, so you have room to fiddle with your setup. I'd make sure you have the engine running as high on the transom as possible...
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    1985 GT 150. Fuel pump question.

    Re: 1985 GT 150. Fuel pump question. Here is a pic of a typical (pre VRO) dual pump installation. 1983. You may find the original factory exploded parts diagram helpful. Check out this website: epc.brp.com After reviewing the factory list, I note that the pumps don't really mount flush to the...
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    johnson 115 please help

    Re: johnson 115 please help The telltales came out in 78. All the crossflow blocks up through 77 had the same powerhead bottom/exhaust adapter configuration. That bottom/exhaust adapter configuration changed in 78 when OMC went to the dual thermostat housing. Your powerhead has the single...
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    Johnson serial number help!!

    Re: Johnson serial number help!! Usually on these older models, the factory stamps both the serial number (which is what you have given) and the model number-which is the number which tells the year-on the casting plug. As an example, see the attached pic of a 1975 engine. Any chance your plug...
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    Help with poor running 1989 Johnson 90...

    Re: Help with poor running 1989 Johnson 90... The last production year for the dual power packs was 1987. Somehow it seems unlikely that the prior owner would have gone to all the trouble to replace the 89 engine's wiring harness with an 87 vintage electrical harness. But it will work on your...
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