400ex Missing cam parts?

[400exrider36]

So I recently got a great deal on a 400ex because numberous mechanics could not get it to run. Turns out the timing was off and I got in running right away. However and hour later the timing was too tight again. Turns out the headbolt studs were stripped and the head gasket was leaking...

ANYWAYS, the camshaft also slid over and one of the lobes wore at the head. After inspecting the situation, I also noticed holes in the head at each end of the cam in which dowels or something should go in to keep the cam in place... I can't find the part number on any site(such as bikebandit.com) I'm lost :( please help!

[250xfreak]

There is supposed to be a dowel at each end to hold the cam in place. See the link.

http://www.heartlandhondapowerparts.com/pages/OemParts#/Honda/TRX400EX_A_(02)_ALL-TERRAIN_VEHICLE_(ATV)%2c_USA%2c_VIN%23_478TE230-24200001_TO_478TE230-24299999/CAMSHAFT_%2b_VALVE/TRX400EX-02-A/2Y14HN1XHN14E0300AA


Honda part number 91002-MN1-671 BEARING (18X37X9)

[CJM]

Yes dowel pins go on each side of the cam bearings.

Id buy a new cam if its worn too much and put HD head studs in b/c if you helicoil them they will come out.

[jkosakowski]

I have a stock cam if your intrested. Let me know 585-991-3997

[dxcody]

Replace the cam.

When i broke a valve in my old 400ex i later found out one of the lobes were bad on the cam (im assuming thats the reason it happened)

[400exrider36]

Thank you so much! Yea I ordered a cam with my bore kit I just recieved.. However should I break in the piston and rings before I put the new cam in to breakin since it says stay 3000 to mid rpm for the first few times riding?

[250xfreak]

no need to break the rings in prior, just put it together and run it. I have never had any issues.

[400exrider36]

And I would love to have hd studs but at the moment I don't want to go through all the hassle and money to do it. I know it's gunna bite me in the @$$ with the 10.8:1 piston but I'm taking my chances this time. I've also heard of many people with bore kits that haven't had a problem. We'll see how it goes. :ermm:

[400exrider36]

Originally posted by 250xfreak
no need to break the rings in prior, just put it together and run it. I have never had any issues.

Ok will do. Thanks

[250xfreak]

where you from? Wausau here.

[400exrider36]

Up by superior

[400exrider36]

Btw I still can't get the link to work :/

[250xfreak]

just go here

http://www.heartlandhondapowerparts.com/

and find the oem atv parts section.

[400exrider36]

Still can't find it I must be blind. It's the same diagrams from the other site... What category is it under?

[250xfreak]

try this

http://www.heartlandhondapowerparts.com/pages/OemParts

[400exrider36]

Ok finally got it thanks everyone.

[mikey726]

When you put your motor back together, torque the head studs to 40 foot pounds instead of what the manual recommends. If you don't, you'll blow through head gaskets with your higher compression. I had to learn the hard way.

[400exrider36]

Haha I was just gunna ask about that... What's the best way? Two nuts together or what? (if you know what I mean)

[mikey726]

If you're not removing the studs I don't think you need to do anything with them. I have heavy duty studs in mine so not 100% sure. Just torque the nuts that hold the head on to 40 foot pounds. Guess I should have said it that way before.