Nobody had an answer for me so I'll share my experience here.
On the 99 OHV, the throttle position mechanism is in the center of the
engine imediately below the wiring harness leading to the intake. There
are two problems here, 1st there isn't room to work and secondly you
can't find an open end wrench to get in there in a 7/32 inch size.
There may be a way to remove the wiring, but I couldn't find it.
By prying open the plastic case around the wiring, I was able to
increase flexibility there some. After looking all over the area I
found a Japanese tool dealer at a flea market with little box end
ratchets including a 7/32" size. Then, with prying, pushing wrigling
and grunting, I was able to get the cam position sensor replaced and the
service engine light off.
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