J18-15 written on back of engine?

[Tom85]

I was changing the gear lever bearings in my rearset today wen i dropped one of the bolts, it landed on the inside of my fairing. To get a better view i flashed my torch in there which is when i saw this (J18-15) written on the back of my engine. I'm curious what it could be if anyone as any idea, my bike is a c1h zx6r by the way.

[MarJay]

[Tom85]

Looks like marker or paint pen.

[Chriss]

I'd suggest that engine's been through a breakers at some point.
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TheShaggyDA: I've got 3 or 4 pairs that predate my wife, so at least 11.5 years old.

[MarJay]

[Tom85]

I've got paperwork from early on in the bikes life with the same engine numbers and the bike had less than 5k on when I bought it, surely wouldn't of had an engine swapped so early on. Suppose it'll have to remain a mystery.

[DrDonnyBrago]

[tatters]

I,ve come across a few kawasaki,s that have pen/paint numbers and letters on engine parts including inside the engine they appear to be from the factory to ID parts. All on oringal untouched engines.
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

[deleted111]

[tatters]

You would think they would be japanese characters but there always latin, even on the old ones that were still assembled in Japan.
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV