XR400 cam is LOUD

[alping45]

I just put an XR400 cam in my 400ex and I love the gains it gives but I HATE the noise it makes! It taps so loud it is very irritating, I honestly don't know if I can put up with it. I knew hotcams made noise, but is it normal for this cam to be this noisy? Is the XR400 this noisy? Is there any way to quiet it down?
Also, I thought I read that the valve clearances with this cam are the same as stock, .004 for intake, .005 for exhaust, can anyone confirm this?

[alping45]

Anyone?

Is it a stock XR400 cam? Been wanting to do this for a while, but don't know if the gains are worth my time.

[alping45]

Yup, stock XR400 cam. I got it off ebay for $27 shipped and it looked almost new. I am very impressed with the results. Just what I wanted, a little more low and midrange oomph, and throttle response is definately crisper. Definately the best bang for the buck yet. I noticed it the most the first time I went to pull up the front end, it came up just as easy, but it held it up MUCH easier than before. So I would say go find yourself an XR400 cam and throw it in, that is IF you can stand the "TICKTICKTICKTICKTICK" that almost turns to a whine at high rpms.

[Bill Fuller]

Double check the valve lash to make sure you didn't set the valves on the decompression stroke.

[ish416]

I have an XR cam in my 416 and it sound terrible. The constant ticking is annoying, but I have been running that setup for over 5 years now and still not had a single issue. Seen a few others running the XR cam all ticked, some louder than others but still very noticeable.

[Ruby Soho]

check your valve's. ill bet there out of adjustment.

[86 Quad R]

what procedure are you guys using to set the lash? and how are yall breaking in there cams?

[RideRed02400ex]

thanks guys,
my good friend has a white bros e-series on a 01 400ex. and u guys are right they sound bad-a**. but, i don't want to "copy" so maybe i'll look into the HMF, i still like the looks of the pheonix though and its reasonably cheap $214, I really appriecate everything guys, and i'm definatly gonna look into the HMF, White bros, pheonix, and maybe
big grinthe Sparks (i want to go new though)

[RideRed02400ex]

whoops, my bad, wrong thread....lol :ermm:

[bbender85]

as said, check your lash, even if you adjusted them when you put the cam in (as you should have). i did a top end build this summer with a hotcam and adjusted the valves. checked them a few rides after and one was a little loose already.

here's a how-to:

How to adjust your valves (http://www.atvriders.com/articles/valveadjustment400ex.html)

[alping45]

I did reset the valve lash after I put the cam in. I left all the plastics off so I could get to the valve covers easily then rode it naked for about a 1/2 hour and checked them, they were still on. I will check them again since its seen quite a few hours since then. But it is just as noisy as the first time I fired it up. It looks like I'm just gonna have to live with it.