Honda 2 hp outboard kicks back violently at pull start.

[longpointer]

Too much oil in crankcase can cause problems. Physically removing carbon build up by removing the head is a tedious job and great care must be used so as not to nick or scratch the metal and if you have to clean the piston head even greater care must be used to avoid debris inside chamber.

[MarkD]

No, I always use regular 87 gas. I'll try SeaFoam first in the fuel and oil then will see if it makes any difference in running and visually on the piston head.

[Gilroy]

No, I always use regular 87 gas. I'll try SeaFoam first in the fuel and oil then will see if it makes any difference in running and visually on the piston head.

Lots of information on here about this topic and even a few talking Honda engines May 20 ...

https://ontariofishingcommunity.com/...able/#comments


Pure-gas.org - ethanol-free gasoline in the U.S. and Canada

[MarkD]

Ok, here is an update on the situation with the motor.
I had put a proper amount of SeaFoam in the oil, some amount in the fuel tank, then even put some in the combustion chamber ... Let it sit for a couple days…
After that it became very difficult to start the motor. I have to pull the rope about a couple dozen times before it would start. Surprisingly, Quick Start does not help at all.
Spark plug seems to fire well though.
I had run the motor with all this SeaFoam in the fuel and then put quite a bit of it in the carburetor through the air vent while running the motor on low and medium RPM.
The problem with this using SeaFoam or similar stuff on this motor is that it is not possible to spray it in through the air intake, because air filter intake pointed downside and the screws holding air filter also hold the carburetor itself, so it is not possible to remove air filter without dismounting the carburetor.
I also could not run it at high RPM because despite the motor itself being air cooled, the lower unit is actually water cooled and gets hot quite fast. So I put the lower unit in the bucket of water but couldn’t run it at high RPM due to water splashing.
I did not see any bit of excessive smoke running the motor with SeaFoam in the gas and carburetor. After that I removed the plug , looked inside the combustion chamber and could see that the piston remained as dirty as it was before. Apparently, SeaFoam helped nothing to the engine.
So I did all of that but the motor is still very difficult to start. I did not change the spark plug as I initially had ordered the wrong ones and am awaiting for the new ones now.
However, after I am able to start the motor it runs quite well even on very low RPM.
As for the kick back problem I’m not sure for now if it became better or not. Last couple times I started the motor I did not experience that but not sure if it is just accidental luck.
Now, if a new plug won’t help me with the difficult start I really don’t know what to do. Ignition timing is not adjusted on this motor: the ignition coil is attached to the motor with two screws and while it is possible to move it closer or further to the flywheel, it is not possible to move it along the flywheel to adjust the timing.
Any suggestions on that?
Thanks!