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    1991 90HP V4 Cylinder Compression Range

    438556 Yes, the VRO port is plugged with epoxy and the new pump is over the pulse port.
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    1991 90HP V4 Cylinder Compression Range

    I changed out the gaskets and it didn't do a whole lot. The pistons and rings looked good. The rings weren't stuck or anything. When starting it from a cold start, I have to keep giving it shots of gas on the choke to keep it running until it gets hot. Then I noticed that the fuel in the...
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    1991 90HP V4 Cylinder Compression Range

    I'll remove the bypass covers tonight. I just did two of them on the starboard side and the pistons have the normal grooves and the rings look good. I have some gaskets in the pack I bought, so I will stick those in. Is there suppose to be oil sitting at the bottom of each bypass? Yes I use the...
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    1991 90HP V4 Cylinder Compression Range

    They range from 105-109psi. It's tough to start it, and it's surging. I replaced the crankcase seals, all the gaskets for exhaust, intake, heads, etc... Carbs have been cleaned multiple times with no resolve. It surges at every RPM too. It's also a whole new ignition system, since I ended up...
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    1991 90HP V4 Cylinder Compression Range

    Does anyone know the compression range for this motor?
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    Low Ignition Voltage

    An update on this: I replaced the starter because it was pretty **** to begin with. This got my cranking RPM’s up, to where one bank was firing. I swapped the coils to the other bank and the problem followed it. So I concluded the power pack (4th new one) was fine. I replaced the coils and it...
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    Low Ignition Voltage

    Thanks! I sent the stator back to cdi and it came back fine. So I went to the starter and replaced it. It’s much better but still no spark, so I left the battery on the charger last night. We’ll see what kind of spark I get today. If it’s no spark I’ll replace the battery and probably the...
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    Low Ignition Voltage

    How would that produce a no spark during cranking?
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    Low Ignition Voltage

    I did scope them with the powerhead off. The grooves are still there in the piston and the rings look free, although maybe hard to determine with a scope.
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    Low Ignition Voltage

    Hello everyone, I have a 1991 Evinrude 90HP V4 that is giving me some ignition problems. Backstory is the motor overheated and caused a whole bunch of headache. The heads and block were warped, the coils blew, the rectifier blew, the powerpack wasn’t working, and the stator resistance was out...
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    Swelling Powerpack

    How much voltage is acceptable on the black and yellow kill wire? I have 15mV on the wire with the key set to on and the engine turned off.
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    Swelling Powerpack

    No, it was broken. The block and heads warped from the overheat and I had them machined and are fine now. Compression is fine; I checked that, but wouldn’t be causing an ignition coil to blow. The power pack top is definitely swelled though. I just installed that back at the end of August and...
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    Swelling Powerpack

    Yea I replaced the stator and rectifier previous to the power pack. The engine overheated and blew the rectifier up, and the stator resistance was out of spec. Now I have blown coils when things get warmed up.
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    Swelling Powerpack

    What would cause a powerpack to swell? I have a 1991 90HP Evinrude.
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    Cam follower roller

    Ok
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    Cam follower roller

    If anyone else finds this, I have gotten by with using electrical tape when my outer shell of the roller broke. Haven’t had issues while waiting for parts to show up.
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    84 Evinrude bogging full throttle surge

    Any luck?
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    84 Evinrude bogging full throttle surge

    Just check the resistance on your stator. Should be 450-600ohms. Do it when the engine is cold, or the resistance reading will be incorrect. Might help to do it when it’s hot too, since yours happens when it’s under a specific load.
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    84 Evinrude bogging full throttle surge

    Also my engine surged like that. It’s the misfire from ignition that is likely the problem, and if it looks like a wide range of ignition problems, I would say it’s your stator.
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    84 Evinrude bogging full throttle surge

    Something still needs to produce the voltage. There’s likely a stator somewhere, and magnets inside your flywheel. What I had one my outboard was an idle problem, but fine while at mid throttle, and reduced power at WOT. It is pretty hard to diagnose without a Peak Voltage Meter, and you’ll...
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