KX Guru Racing

11001-1317 CYLINDER HEAD FITS 90-94 KDX200 PICS AND MEASUREMENTS
How can I tell if my KDX200 90-94 head is stock or not?
That's a good question.
Since I have used parts only I can only provide the information that I can measure.
However, I do have 4 heads from those year ranges sitting on my desk so we should be able to come up with a reliable number.

Here is the measurements of all the heads as well as the order in which I measured them.
1990 KDX200 HEAD MEASURED
22.81
22.74
22.77
22.81
22.88
22.84
22.88
Average of 22.82mm or .898"

1992 KDX200 HEAD MEASURED
22.86
22.94
22.86
22.83
22.84
22.87
22.97
Average of 22.88mm or .901"

1993 KDX200 HEAD MEASURED
22.92
22.90
22.98
22.89
22.85
22.86
22.94
Average of 22.91mm or .902"

1994 KDX200 HEAD MEASURED
22.79
22.80
22.82
22.82
22.81
22.85
22.81
Average of 22.81mm or .898"

Average of the averages 22.86mm or .900" is very close to stock.

This dimension is very difficult to measure accurately even with a good depth mic so I wouldn't really trust these numbers too much..
1990 .013" = .33mm
1992 .005" = .13mm
1993 .014" = .36mm
1994 .010" = .25mm

Average .011" or .28mm I do not like this number.... It's just not accurate enough..