400 smoking. What now

[Zakradu398]

I noticed the quad is smoking just a small bit. The only time it dOes it is when you hit rev limited then let off it will puff a few. What are the possible problems. I already plan on a new top end and valves. What else could it be? Thanks!

And also what service manual is recommended for a 400 and where can I get one.

[trx250xtim]

Originally posted by Zakradu398
And also what service manual is recommended for a 400 and where can I get one.
Clymer, google it and you can find it for free.

[CJM]

Honda manual can be found for free as well on google.

If it smokes check compression, 100-128psi is normal

[Baileygunns]

http://www.4shared.com/document/7ct1lhkS/Honda_TRX400EX_manual.html

You're welcome

[Zakradu398]

Going to check compression here in a few, will post up what it is.

[Zakradu398]

118 psi and i adjusted the valves, they were very close though to being in spec.

[CJM]

Then its ok for now, could just be some valve seal leakage or sometimes your running a bit rich and it looks like blue smoke when infact its black.

[Zakradu398]

Originally posted by CJM
Then its ok for now, could just be some valve seal leakage or sometimes your running a bit rich and it looks like blue smoke when infact its black.

It is black smoke and I just went from a 152.5 to a 155 main.

No indications of running rich on the plug though, It was a nice light brown and dry.

[CJM]

If your not losing oil, comp tests fine and the plug looks ok Id leave it alone for now.

[Zakradu398]

Cool. Saves me a couple hundred