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View Full Version : when to repack exhaust



bigbad400
08-10-2008, 02:22 PM
just that, when do you know to repack? is there any symptoms? less performance, or anything.

my buddys got a z400 and its just kinda weak, my 400ex smokes all over his and its only got a pipe and filter basicaly, hes got a pipe, filter, and cam. what could cause it to be weak? its a 2004 and he dont ride it but 20 hours a year, i cant see the rings being bad, and compression seems good. filter has an outerwears and a outerwears lid too so its not a dirty filter. any thaughts on what it could be. i heard that the carbon build up can severly decrease performance, should i recomend he cleans his pipe? repack the tip or is it something more internal. oh its a big gun pipe too.

hardtrailz400
08-15-2008, 07:57 AM
Is his jetting set-up right? I would look into that with the mods he has

hardtrailz400
08-15-2008, 08:11 AM
Is his jetting set-up right? I would look into that with the mods he has

bigbad400
08-19-2008, 09:06 AM
all the mods are the same as last year and it ran fine then, and it ran fine at the beginning of the year. its definatly not jets. maybe the valves are out of adjustment some.