you can try this
This is a general OS issue, not just an OSx86 (hackintosh) issue. here is your fix:

CODE

sudo nano /System/Library/LaunchDaemons/com.apple.syslogd.plist


after line #23 add two additional strings (these make sure that the syslogd logger only write emergency errors to the system log.

CODE

#23 <string>/usr/sbin/syslogd</string>
#24 <string>-c</string>
#25 <string>0</string>


Optionally you can also cap the log file to a certain file size using:

CODE

#23 <string>/usr/sbin/syslogd</string>
#24 <string>-c</string>
#25 <string>0</string>
#26 <string>-db_max 2500000</string>