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trxex
12-22-2002, 08:46 PM
was hill climbing at night time,noticed my header pipe near head was glowing red after a hill climb.then i took my friends 2002 400 ex up same hill,same glowing red both machines are 100% stock.question is iam shure these machines are jetted on the lean side from honda because of emissions,witch would result in shorter engine life.any one richen up your stock machines,if so what # jets and any performance gain

KAWSAM62
12-23-2002, 06:43 AM
go to a 40 pilot and a 160 main to start with you might get a butometer charge in performance but your engine will last longer:cool: