400ex Timing Chain

[domijam]

I just took my 400 all apart to reset the timing. It runs well now but the Timing chain ticks like crazy, really loud. I dont know why its soo loud now, as opposed to before i had set it. It never used to tick at all. What are the possible concequences from this if i keep riding like this. What are you supposed to do to fix the ticking problem???? New timing Chain? New Cam???

[250X_project]

First check the valve clearance. (.004in-.005ex if cam is stock) If that's fine than you may need a cam chain and/or tensioner. The tensioner is easier, but the 400EX is known for stretching the timing chain. Also make sure you didn't leave any bolts, such as the cam sprockets bolts, loose.

I have heard rumors of a 450R cam chain fitting, lasting longer and even being cheaper. Ask around or even make a thread about that before you try it thought please. I am not sure if this is true, or not.

I do know that companies, such as ProFab ATV, offer stronger chains for around the price of stock, if not less.

[250X_project]

I was wrong. It is $9 more than stock, being $89 rather than $80.

On this site go to "reviews" where you will then see the heavy duty 400EX timing chain section. Pictures are there along with the review given.

Almost 1/8" thicker!:eek2:

[maxamillion]

Its actually a 2002 crf450 (dirtbike) cam chain that fits in the 400ex. I have one in mine after snapping my stock one. It runs great. Youre right about it being cheaper, they range from $26-33.

[250X_project]

Oh okay. Thanks a lot. Are those prices off eBay, or something of that sort?

Did your chain actually break when the engine was running?:eek2:

[maxamillion]

I bought mine through C&d for $33 but I think you can buy it from service honda for a little cheaper. And yes my stock one snapped after I landed a small jump (right after I installed a brand new piston actually). Luckily the piston was fine and they valves were not bent at all!

[250X_project]

$33 is a great deal. You're lucky you didn't get any bent valves, let alone all 4. :eek2: ;)

[vwdriver222]

I have a 2002 bone stock 400ex as far as the motor goes and I was wondering if i need to worry about my timing chain? I have had it since June 2001 and i ride all the time. It runs perfect but always looking to do preventative maintenance, thanx.

[maxamillion]

I wouldnt worry about it to much. But if you ever have the clutch basket off go ahead and throw a crf450 chain in their for cheap insurance. Snapping a timing chain is not a common problem. If it starts to stretch it will make noise and you will know it needs replaced.

[sc400ex_rider]

On this site go to "reviews" where you will then see the heavy duty 400EX timing chain section. Pictures are there along with the review given.
where is the review section?

[250X_project]

At the top of the page where you can click "forums", to get here, go 2 over. It will say "reviews." Also, you can use the quote option at the bottom of each message to show what comment is being referred to (such as mine) ;) :D

[sc400ex_rider]

o.......thx buddy

[sc400ex_rider]

dam that link dont work for me.

[pigpin]

the hd chains are deff worth the time and money!!!!!!!!!!!!!

[jeremy_283]

the only differnce is the heavy duty has one more plate then the others..........

[Norris3710]

a yfz chain is only 13 bucks

[JOEX]

Originally posted by Norris3710
a yfz chain is only 13 bucks
How much grinding is needed to make it fit a 400ex?