Advanced timing key?

[BlasterKX]

i found this on ebay and was wondering if it really makes that big of a difference and does it affect how it idles and reliable etc.
Thanks

vito's Degree key yamaha blaster 200 to advance timing - eBay (item 360103235996 end time Nov-30-08 08:37:32 PST)

 

[RobJ]

Price is OK, but they kill you with the shipping and handling. Is a rip-off. Look under DIY there are instructions to do the same thing for free.