400ex white smoke..

[Nettles 400ex]

Ok, so after i bought my fmf muffler off of my buddy ive been riding my 400 alot harder then usual. Now whenever i throttle up there is a lot of white smoke coming out of the muffler. If anybody can help that would be great. thanks

[CJM]

Sure its not bluish white? Bluish white means oil, which means rings/worn cylinder.

Compression test, 100psi minimum. Check the plug make sure its not lean and monitor the oil-change it once and ride a few times. It drops a good bit your def gonna need piston/bore job.

Also did you jet it when you put the pipe on?

[400exjoker]

did u rejet after you put the pipe on?

[Nettles 400ex]

I didnt jet. Thats what i think the problem is. and @CJM, i rebuilt it last fall and just started riding it now. Replaced piston, cylinder and new rings so i really hope thats not what it is cuz thats a pain in the ***.

[01boneless]

Originally posted by Nettles 400ex
I didnt jet. Thats what i think the problem is. and @CJM, i rebuilt it last fall and just started riding it now. Replaced piston, cylinder and new rings so i really hope thats not what it is cuz thats a pain in the ***.
if you dont jet it you will be rebuilding it again very soon, hope its not to late how long have you rode it with out jetting it?

[Nettles 400ex]

2 days.. Should have done it right away huh? Lol

[Thomas440]

:facepalm:

[01boneless]

yea like befor you rode it :double facepalm:

[Nettles 400ex]

SO how bad did i **** it up lol.

[Thomas440]

Couldnt tell ya, I'd just jet it properly and hope nothings too bad, hopefully you didnt melt your piston or anything... goodluck

[Pipeless416]

relax, you didn't blow your engine from a slip on and stock jetting, especially with only two days of riding. if you're burning oil, it was probably a long time coming. like CJM said.. do a compression check.

[TheAwesomehonda]

Does it have good power? If so i'd just jet it properly and not worry about the smoke. lol :Thiple facepalm:

[quadmanw]

I rode mine with stock jetting and a slip on for two years before a rebuild.. You're fine lol

[01boneless]

Originally posted by TheAwesomehonda
Does it have good power? If so i'd just jet it properly and not worry about the smoke. lol :Thiple facepalm:
thiple? lol jk
anyhow u dident blow it up but you need to jet it. without it causes a lean condition on your motor and can run hot and hurt the topend

[GAZ-V-21]

Ill be changing my jets this week but i have slip on and k&n filter it dont backfire or nothin with stock jets actualy runs great with some shell 93octane.

[hybridracer686]

check valve seals. slip on is likely spark arrested and a little restrictive any way and shouldn't create a bad lean condition imo.

[Nettles 400ex]

Hey guys, thanks for all the replys. I just took my carburater off of my 400 the other day. Thank god i did because my gaslines were rotting away sum how. I didn't order the new jet yet. I have an FMF powercore 4 with no silencer in it so theres alot more air flow. Can anybody tell me what kind of jet i need and what are the proper settings? thanks guys. Appreciate it.

[CJM]

42 pilot and approx 152-160 main

[Nettles 400ex]

Where could i get those? My local honda dealer?

[finsteratv]

yup or jetsrus.com

[Nettles 400ex]

Thanks alot guys, ur a big help.