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ncsmash
06-16-2007, 12:56 AM
Allright i just did a whole topend rebuild and have maybe about 3 hours on bike for break in and took it to the the track tonight to further the breah in process and noticed that when its warmed up if i rev it, it blows out a small puff of white smoke could this be a jetting problem or what please help me out.
ncsmash
06-16-2007, 02:28 AM
sorry i forgot to add that i have a 400exthat is bored to a 406 with a HMF slip on and an aluminium airbox with no lid and a twin air air filter and my elevation is about 4000 ft in arizona so its kinda hot. any suggestions on jetting would be greatly appreciated
JW450R1
06-16-2007, 08:21 AM
I think if it is a jetting issue it would blow black,orblueish smoke.
It kinda sounds like a head gasket.How is the oil.(clean).
Did u torque every thing down>?
ncsmash
06-16-2007, 12:18 PM
yea brand new oil everything was torqued but its weird because it only does it when i do quick revs and when its warm there is absolutely no smoke on start up and after its warm if i turn it off for a couple of min and turn it back on it doesnt smoke so i am kinda stumped.
krt400ex
06-16-2007, 03:35 PM
its just runnin a little rich. mine does the same thing. dont worry about it. its nothing thats going to hurt the engine
ncsmash
06-16-2007, 03:56 PM
ok sounds good maybe i will try to tweak the carb a little and see if i can fix it
Eviltanker
06-20-2007, 08:36 AM
Did you replace the valve seals? you could be getting a little blowby on decel. Not a huge problem, just keep an eye on it . if it gets worse you will want to replace them.
ncsmash
06-20-2007, 03:59 PM
Yea all valves and seals were replaced thats why i was so confused
skragg
06-21-2007, 06:57 PM
leave it it sounds as though its running rich in a hot climate and if u run in high stress situations running a tiny bit rich is a good thang
ncsmash
06-21-2007, 07:46 PM
Yea i am in arizona and it,s been in the 100's lately but i noticed it at the track during the night races and it was probably in the 80's and i really dont think i stress it that much but who knows i do trail riding and mx and desert rcing but havent put that much stress on engine since rebuild the most stress is at the track
skragg
06-21-2007, 08:00 PM
yeah going hard at the track and in the hp sucking sands of the desert can put a bit of stress on te motor
krt400ex
06-22-2007, 07:29 PM
Originally posted by skragg
yeah going hard at the track and in the hp sucking sands of the desert can put a bit of stress on te motor


got that right...alot of stress