smoke

[comer400ex]

Hey there im new to the forum, i have a '06 400ex and recently i noticed my engine starting to smoke from mid rpm to redline. it first started when i did a cheap oilchange (valvoline 10-40) i have a full yosh rs-3 system and a dynojet kit so i thought it was just jetted incorectly so i messed with that a while and finally just gave up and put stock pipe and carb settings back on, after that i did a oilchange with honda hp4 it seemed to help no smoke or just not noticeable, well today i was gonna ride for a while so i went out and fired it up, and of course its smoking again. So now i guess i will have to rebuild so i was looking for some suggestions for an engine build up, my main target for a little boost in power is i want some more low end torque. so any comments and ideas are welcome, thanks.

[kawiefan]

416 with a mild cam

[drew416ex]

416, 11:1 piston, stage 1 or 2 hotcam

[Honda#4]

416, 11:1 piston Stage 2 Cam with a ported head, 450 carb and a 14F tooth

[hornetgod13]

My 06' started smoking (white) on start up and quick throttle blips. The valve seals were the main cause but, the compression test numbers were a little low too so I decided it was time to replace the valve seals and at the same time I bumped it up to a 11:1 416cc piston with Stage 1 Hotcam. I also installed a heavy duty cam chain while I had it torn apart.

GT Thunder 452cc conversion and a head overhaul with a port and polish and cam. Mine is quicker than a 450r and I can't ride for sh!$!!

[Phillburt57]

Hey Hornet do you have a part # for the valve seals I can't find them anywhere.

[drew416ex]

Originally posted by Phillburt57
Hey Hornet do you have a part # for the valve seals I can't find them anywhere.

The part # is 12209-KL4-005