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I have both engines in my mowers and only need to keep one. Which one should I keep? Both have been serviced regularly and work just fine. But I know that some motors are better than others, even by the same company. I just don't know enough about them. Thanks in advance.

Is the I/C an opposed twin 20 horse? Personally IF the 20 HP is an opposed twin, i'd keep that one.

Not sure if it is opposed. This is the 20hp engine.

Opposed twin means the cylinder heads are going to be ,well, opposite of each other

Tracking. These are the two motors.

I would keep the 20hp twin.

Thanks. That is what I am leaning towards.

If you have space, I'd keep the non-used engine. One never knows...

If you search for Intek issues you will be flooded with posts and problems. Personally if it says Intek, stay away from them. Any engine that breaks or bends pushrods every 40 hours is junk in my opinion, and to basically keep these running you have to use premium gas and premium oil, and adjust the valves frequently. Look around Intek engines are junk when new.

Everyone's entitled...
Bent pushrods come from walking valve guides usually from overheating the engine. Don't overheat the engine.
Premium gas not needed. Helps nothing.
Premium oil not needed. Any SJ rated 10w30 will work. If has zinc added that is a plus.
Adjust the valves every couple hundred hours.