Yep I found the same on my 28. Looks like a backyard mechanic but I think its Honda as my bike was unmolested before I got it.
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1995 A kit TZ 250
1994 Rothmans NSR 300sp SOLD
1998 RM 250 freestyle/motorcross
1998 Meathanol burning CR 500 AF super retard/motorcross/sand dunes/play bike