Cold start?

[DE400EX]

` My brother in law just got a 01 400ex, it came with a stock exhaust, kand n and no lid on the air box... It was jetted stock pilot and 160 main..

So i put in a smaller jet, he got some 10w40 ooil and now it wont start... The plug was black as hell. We also put in a new plug.

It is cold as hell here today, do you think that is why it wont start?

I have a 06 400ex and mine wont run either, it starts but dies, his wants to start but hes got nothing... It gets spark and fuel.

[DE400EX]

IN delaware were 450' above sea level..



Anyone? Ive searched and from my understanding they suck to start in the cold..

[400eXr1d3rZ]

put in a 42 pilot.

[DE400EX]

Yea thats what im telling him to do now.
We pulled it with his truck it started and runs good now... I figured it was the cold that wasnt letting it start...

[Honda#4]

Put in a 42 pilot and bring down the main to a 155, a 160 main is too rich for stock exhaust.

[DE400EX]

I put it all back to stock for now, 38 and 148... And a stock filter.

We got it running and stay running, but i think his valve seals are bad its smokes pretty bad on decel.

[400eXr1d3rZ]

Originally posted by DE400EX
I put it all back to stock for now, 38 and 148... And a stock filter.

We got it running and stay running, but i think his valve seals are bad its smokes pretty bad on decel.

Yeah, that's his valve seals, does it burn oil on start up too?

[DE400EX]

It doesnt so at idle, but once you tap the throttle it does. Seems to do it bad on deceleration..

[Honda#4]

I would suggest not riding anymore so you don't have to pay for a total rebuild too. Don't bother to start it up, take it to the shop right a way.

[DE400EX]

As long as the oil level stays good he can ride it. But as soon as he gets the seals im goin to put new ones in..

[Honda#4]

Good idea