Engine serial number help

[doscientosX]

I have tried to be self sufficient however I cannot find the serial number on a 200x motor. Any help?

[ironchop]

Way down on low left side under the shifter shaft

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[doscientosX]

Ok in the stamped box between the shifter shaft and the oil drain plug?

[207RIDER]

example of mine on my 200x motor... this is the left side view under the shift lever.https://uploads.tapatalk-cdn.com/20170405/cbd65b52fb22c6a2dd0fecf6bd11b27a.jpg

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[ironchop]

Ok in the stamped box between the shifter shaft and the oil drain plug?
Yes

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[doscientosX]

Well it is that easy but in my case not. I saw the box and cleaned it well and looked with a flashlight, nothing. Took a piece of sand paper and cleaned off the paint, nothing. So I am assuming the numbers have been rubbed off for some reason. Got this motor in a trade a few years back, don't know the history. Guess I'll do the best with what I know on seeing it is the same as my 84 and using the jug off it in my rebuild.

[ironchop]

Take a pic of it and post it up.

Only reason I can think of for there to be no numbers is that perhaps it's an OEM replacement case half. I know some MC and small engine manufacturers sometimes left the serial pad blank on replacement case halves.

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[doscientosX]

241710

This is what I have

[yaegerb]

Yeah that sucks, it's been removed

[doscientosX]

242006

Well it ment something to someone at one time. Not a stock piston and a copper head gausket. I wonder it's true story......

[350for350]

It also looks like it dropped the exhaust valve.

[shortline10]

A new replacement case from Honda wouldn't come with any numbers . Not that uncommon.
I went threw a half dozen left side cases while racing back in the day .