Does your bike blow blue smoke? (Survey)

[fitethesystom]

I have a 2000 Honda 400EX that blows blue smoke but hardly uses oil and I have heard the 400EX is known for burning oil regardless of the wear. Whether this is true I do not know, but my bike has much power and does not suffer any mechanical defects other than the smoke, none the less I will replace the rings & valve seals, hone the cylinder, and maybe put a 416 kit on it. If you know what a 416 kit sells for please let me know. I want an honest number from you guys whether your Honda 400ex smokes, regardless of year. Please complete the poll.
Mike,

[TRX_450]

mike you no mine puts NO smoke...lol

[400EX QUADER]

I bet if ya call that # in my sig tomorrow he will give ya a $165 shipped price for a je 416 10:8:1 piston kit with cometic thin flexsteel gaskets. this is the set-up to go. he's a parts dealer btw.

[stalefish_132]

your jetting could be a bit rich could be part of the problem.
my 440 uses ols buti never seen any smoke:ermm:

[Rico]

Originally posted by stalefish_132
your jetting could be a bit rich :


Very possible. When is it smoking?? at startup, under power, idling, all the time, when shifting gears??

If it's a 2000 and never been rebuilt then it's time for an overbore, valveseals, piston, etc,.

[fitethesystom]

It smokes mainly at higher RPMs more so in gear under load. I'm convinced its rings. Still has much power. I also agree the jetting is probably too rich, because the plug is black as night with dry carbon all over it. I am going to tear it down after I do a compression test... Also the oil was a little overfilled I think.

Mike,

[400EX QUADER]

when i'm in neutral and press the throttle a decent amount, a tiny bit of blue smoke comes out after I let off the gas. I'm doin my 416 in a few weeks tho so i'm not worried...

[fitethesystom]

Sounds like your valve seals. What year? Somehow alot of them smoke. Maybe poor piston ring quality?

Mike,

[400EX QUADER]

mine's an 04...

[fitethesystom]

aint that a beach.... i wouldn't be impressed of my 04 done that! Oh well. It's the nature of these engines. This is my first fourstroke that has smoked! Ever! (Visibly). I plan to ride it for a while and sell it when it's fixed and purchase a YFZ. I may keep it, I am not sure.

[400EX QUADER]

My friend has an 01' and his was doin that for like a year or 2 then it just seized a few weeks ago...:rolleyes:

[bansheemorphine]

i hve a 440 kit in my 99 ex and it smokes some when i rev it up when i first start it but after it wams up it doesn't smoke

[stever25]

I have a stock '99 that has a bagillion hours on it and has never been rebuilt, it doesn't smoke alot.

[400exstud]

it smokes some when i rev it up when i first start it but after it wams up it doesn't smoke

same here:o

[fitethesystom]

Lucky you guys. Some are more fortunate than others. Too bad your bike smokes banshee, I would be some pissed. Their notorious for valve seals. I think all I will do is put a Wiseco performance piston in, hone the cylinder and put new valve seals in and go from there. If it still smokes... out the door she goes. Like I said before, this is my first smoking fourstroke. I'm tearing it down this Wednesday...

Mike,

[GOTFEAR]

I have a 99 and it smoked a little even after rebuilding it (440 big valve full race port stg 2 cam) I think ex motors get verry hot and the cylinder gets out of roun abit. try changing your oil i use kendal 20-50 and lucas oil and mix the two oiles 50-50. this will handle the heet mutch better and the smoke

[fitethesystom]

I have done that, I think the ring's are at the end of there rope on this bike. I have a hard time understanding why these specific motor's smoke like they do. :confused: A fourstroke is NOT supposed to smoke. Must be a major design flaw.

Mike,

[fitethesystom]

took my engine apart today, getting cylinder honed and new rings. cold compression test read 120psi dry.

MIKE!