Hi every body, just buy a new WR400 1998 the bike run great at hi RPM but it dont keep his idle I have clean the carb. put everything at the shop manuel specs needle at position 4 the main jet is 168 and air screew at 1 3/8 I cant turn more my idle ajustment it at is maximum !!! Any idea ??? any help will be appreciate. If I put the chke the bike run very fast maybe 4000rpm. MY TPS IS BUSTED AND IT'S DISCONNECTED.