[Carolynskiii]

If it smoked before you changed topend the try changing the spark plug.
If that's not it then you're gonna need to check your compression.

 

[Carolynskiii]

Clutch would be a possibility if you didn't use a wet clutch oil.

 

[Carolynskiii]

If timing is a little off it will idle fine.
Lack of power could be due to timing but it would be waaaaay off and poping thru the carb. Could also hear possible piston slap.

After you put the top back on you said it had a "bog". If it was sputtering or had a backfire before you did any adjustments to the carb it's more probable that the timing is off.

 

[Carolynskiii]

Found this on another thread..... something to check. Also was the tensioner engaged when you took the pics?

"look right behind the cam lobe nearest to the sprocket. If there is a small 4mm hole with nothing in it, that's your problem. There must be a pin and spring in it to hold the anti reverse device on the camshaft. If the pin is not there, the device is turning with the cam and your right hand exhaust valve only closes every second turn."

 

[Carolynskiii]

That's it but I just remembered you installed an aftermarket cam which typically don't use decompressors so that's not it lol
Does it rev up and won't move? Like it slipping?
I'm going back to the clutch now but it's weird timing that it would stop working after an oil change unless the old owner used a car oil.

 

[Carolynskiii]

Hard to tell in the pic but are the lobes totally facing down? They look spun a little to the left.

 

[Carolynskiii]

I wish I knew more about the 400ex but it seems your lobes aren't as down facing as the Hot Cam instructions show. I don't know how this can be adjusted or maybe it's possible that they sent you the wrong cam?
Those lobes absolutely need to be down at TDC.

 

[Carolynskiii]

....or maybe you need a new timing chain cause it stretched?

 

[Carolynskiii]

You can't adjust it by losening the sprocket bolts?

 

[Carolynskiii]

Retro it seems to be the same "T" as specified in instructions from the forum on a 99 and newer 400ex

http://www.hondaatvforums.net/forum...-end-400ex-fourtrax.html#/topics/21959?page=1

 

[Carolynskiii]

and here's the pic of it in the manual of this bike is a 99-2002 Honda 400ex
Are there two of these or something?

 

[Carolynskiii]

or setting TDC the old fashioned way by unscrewing the spark plug and sticking a long skinny screw driver in the hole to make sure that piston is all the way at the top.

lol hopefully one us is bound to help these fellas hopefully sooner than later lmao

Something is not right at the cam or sprocket tho because those lobes don't look facing totally down.

 

[Carolynskiii]

Sicknasty can you compare your cam positioning to your other bike that has a hot cam?

 

[Carolynskiii]

Good going Sicknasty....hard to tell what's going on from here lol ....back to the clutch!

 

[Carolynskiii]

Double agree!! Lol this was definitely a head scratcher! Glad you're back to terrorizing the neighborhood again sicknasty!

 

[Carolynskiii]

Dillirgaf you are a prince for taking the trouble and time to do that.