anyone too lean?

[papaw]

is anyone out there too lean and can't find the problem?i recently found out that the vent hose that goes into the heat shield is sucking air and its not supposed to.its causing a lean condition, so right now its plugged but it needs to be free to exhale so to speak.i'm thinking maybe the air cutoff valve,but haven't done anything yet.any input would be appreciated.

[mikeboone]

PAPAW--How you like the carbon wheels? They are high priced but superlight. Where did you purchase from?

[400exRacerX]

what heat shield, the header heat shield, huh?

I believe I saw a check valve on a website once to prevent the vent from sucking air and only letting it, well, vent! If I find it again I will post it if your interested.

[Winged Warrior]

He means the vent tube comming out of the upper part of the carb going into the white plastic shield under the gas tank.Please guys help him out ,wish i could, this is a tuffy .:huh

[kat400ex]

recently found out intake boot on the 400ex's 1999,2000.....are cracking causing it to suck air leaning motor out and eventually there goes the motor......2001 are fixed*** bought mine from MARCUMS ATV......But the damage was done.....its in shop having a 416 kit installed with vortec basket and barnett clutch and xr 400 cam....cant wait to feel the power!!!! good luck

which boot is cracking. before the carb or from the carb into the motor and how much is it to fix

[kat400ex]

it s the intake boot goes from carb to motor.....there about 35 i think please dont quote me on there just email terry (marcums atv ) he keep s them in stock......theres no way honda would recall them because then they would have to replace everyone motor too.......best thing to do is email terry and he can give you a price....good luck