You assumed it was okay instead of using the alignment tool per service manual instructions before installing drive.
Drive does not get installed until proper alignment is verified using an alignment bar made to the specifications for your drive system.
If you had major transom rot or issue...
To the OP, make sure it's not a very bad outdrive system before you go and buy the replacement engine.
OMC Cobra/King Cobra sterndrive has limited parts support but one can get along if you don't break something not available.
Yamaha Sterndrive. Don't bother with this. Change to Alpha One...
If your outboard is running correctly and not misfiring or running excessively rich, then it is either upgrade to a late model 2 stroke fuel injected outboard which will cut down on a lot of that smoke or 4 stroke fuel injected outboard or switch to an inboard & I/O powered boat.
Some premium...
Do only what is necessary to get it to look as good and properly running as you are willing to financially accept in case you need to sell it later on. As you will likely will have to eat all the costs that exceed the price you paid for it and the materials you used to restore/repair it versus...
Combustion engine fundamentals do not change whether inboard or outboard. If you significantly overload an engine either the transmission and/or engine is going to prematurely fail earlier or accelerate wear and tear to unacceptable levels rather quickly versus the expected lifetime.
Have you...
If the carb rebuild was not checked AFTER the engine teardown based on your cylinder damage, you might want to re-think that and double check it.
It could have been mainly overheat damage but you could have a lean issue masked by the primary issue.
That engine is only one WOT run away from...
Issue #1 spotted on the first video. If the parts schematic for your model's carb does not show the thick washer/gasket for the needle seat, do NOT put one on it.
The motor is going to starve itself for gas because there isn't any way to get the float level horizontal without seriously messing...
One thing I didn't clarify, the steps to install the cable also means you have to put the controller shifted fully into forward at wide open throttle position.
You won't be able to install the cable with the given instructions without doing so with the gearcase shifted into forward with shift...
It sounds like you either have the shift cable improperly adjusted or a shift cable that is out of spec with too much slack where the slack cannot be taken up to the amount needed.
I know on the V4 crossflow engines, you are supposed to remove the shift cable, shift the gearcase fully forward...
+1 to this. It's no different than a 1999 or later Chevy 1500 truck running the 5.3L V8 LS series engine.
Non-adjustable timing because of the crank & cam position sensor. Timing is handled by the Engine computer module.
Please do buy the service manual for the setup you have. This likely...
I'm afraid I need to convey the serious situation you are in now. Yamaha no longer makes parts for that sterndrive system anymore because they lost a lawsuit for patent infringement and was ordered to stop making the drives.
No part company hardly wants to touch Yamaha sterndrive either...
I suspect the dolphins know fully well that us humans swim in a smaller fish bowl than them, so remember they are watching us going around in circles in that small bowl/tank, not the other way around.
Driveshaft splines are completely different. Have to change driveshaft on lower unit to match powerhead.
I would seriously pull that lower unit off and verify those splines very closely and not run it any longer until that is verified.
For lower units made 1992 and afterwards for V4...
The least drama free version is the CDI version hose/barb assembly part # 551-34PV.
Mityvac and the Harbor Freight Maddox kit are probably the most chosen units for pressure/vac combo unit.
Yeah, there is already a conversation thread about the motor here in this forum.
I would recommend discussing it here: https://forums.iboats.com/threads/brp-reveals-a-new-style-of-outboard-rotax-powered-horizontal-crankshaft.759425/
This one really belongs in the Other outboard category as BRP...
To the OP, the first thing you should be doing for mercruiser when asking for help is provide the full engine/drive name, the model, and the serial number on the identification plate of the engine.
Example:
Mercruiser 4.3LX Gen+ Alpha One Gen 2
Serial number: OF803000
If that is a balanced...
This website provides a service manual part# cross reference and you can buy from them.
https://www.outboardbooks.com/manual/J115TLEO/Johnson/
This is the only BRP/Evinrude authorized entity to re-print 1996 and older OMC manuals and sell them to the public if this company does not have them...
