EZ GO MCI

Today I was working on customers with EZ Go carts. Every one of them had engine problems. So today we took out five of the MCI 350 engines. Now not alot of people that I have talked with know this but MCI actually stands for motor cost investigation. EZ Go wanted to cut the cost of their pre mci model and that is where mci comes from. Not that it is a bad engine but, I prefer the pre mci 350 model. There are very few differences in the two. The flywheel on the mci lacks a key for it, which actually makes it more easy to remove. But the rocker arms on the mci is what really drives me crazy. Unlike the pre mci, which have a slot in the top for a screwdriver for valve adjustment, the mci has a square top and its smaller than a eight mm wrench so I use needle nose pliers. The easiest way to tell the difference in the two models is to look at the exhaust. The mci exhaust is aluminum in color and is molded with the head. The pre mci exhaust is cast iron in color and mounts to the head with four bolts. You can also tell by looking at the bottom of the blocks on the exaust sides. pre mci blocks will have EH 35C or EH 29C mci will have EH 352C or EH 292C. You can not swap out these engines in carts without a retro kit or by making your own wiring harness! But anyway, we have them torn down so they will be ready Monday. One more thing. When you hear that an engine is bored at 25 over or 50 over, that is in mm. I like to go by inches myself so if you are like me 25 over in inches is .010 and 50 over is .020. Any 350 EZ Go mci or pre mci engine cylinder that is 2.638 in. or more should be bored. EZ Go recommends that the cylinders should be bored if they are at 50% which would be 2.63765 in. I wont let them go to 75% though myself. And ALWAYS bore both cylinders, even if only one is needed.