Haro sold scores of models, maybe over 100. Bob Haro got his start in bikes with freestyle bikes in 1978.
serial number decoding:
K=November
7=1997 (or 2007) (late year production for the next season)
KY = model Model codes don't always match the model name.
The rest of the numbers are a sequence number so the 2,494th frame in that month, or model or particular frame. You never know if they used separate numbers for each model or for the entire factory. 2500 per month is a lot of bikes for a small company.
I don't see any similar frames in the 1997 catalog.
2007/2008 catalogs do have the Z1 with a similar frame and colors. 3 colors in 2007, 4 in 2008. The Z1 was listed in 2007 2008 2009. The 2009 had 3 bright colors only.
1 piece cranks oem. So yeah, someone changed out the cranks for something better.
Z1 was an inexpensive general purpose kids bike. not a freestyle or race bike. for "Tearing the sidewalks".
2007
View attachment 279967
2008
View attachment 279968