Hi all. This is my first post to this group having sold my KLX300 on Monday and buying a WR400 the next day. By the way, the WR is twice the bike the KLX is. I took the WR for a ride at Pozo yesterday and could not believe the power difference between the two. Anyway, could someone please supply me with the part number for a 99 yz400 throttle restrictor? When I checked to see if the previous owner had trimmed it, I found out he had removed it. From reading the information on this forum, I believe it needs to be re-installed and the yz400 model will work best. Thanks.