Cam Tower Crack?

**Degsy** · 09-29-11, 10:52 AM

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Christian, install the cam caps with no cams and feel the mating surfaces for any lip. You can feel 2thou with your fingers. The aluminum will hone easily if needed. Use 400grit paper to hone with something like a socket or piece of round stock steel. Hone in direction of cam movement. Do the cam install and rotate by hand for feel and then check the mating surfaces for any wear and re-hone. Again, itnisnt rocket science. If the cams rotate smoothly with no binding at all and aren't loose you should be fine.

**Degsy** · 09-29-11, 10:54 AM

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Originally Posted by Marc

Isn't that cam tower a one piece thing that holds the cam, both sides, by sliding it in one end with no caps, just holes? Isn't that a replacable part that you can buy for like $90?

He has a spare can cap. He is trying to avoid buying the disposable head for $250 or whatever it is they go for.

**Marc** · 09-29-11, 11:10 AM

Is this simular to what that is, all one piece?

http://www.powerpartsplus.com/pages/...EB2MEB4E0200GA

**csmutty** · 09-29-11, 11:41 AM

Originally Posted by Degsy

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He has a spare can cap. He is trying to avoid buying the disposable head for $250 or whatever it is they go for.

The tower is one piece, not sure what you mean by cap. And yah, I have $1200 into this head so replacement isnt really an option.

**Degsy** · 09-29-11, 11:45 AM

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When I say cap I mean tower.

**csmutty** · 09-29-11, 11:48 AM

Originally Posted by Degsy

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When I say cap I mean tower.

Ok thanks gotcha.

**csmutty** · 09-29-11, 11:54 AM

And jay this was on my bike not yours.

**nt650hawk** · 09-29-11, 12:13 PM

Is That why your bike would not start?

**Paul_E_D** · 09-29-11, 01:48 PM

call your engine guy, cause we're all just talkin smack!

**Degsy** · 09-29-11, 02:09 PM

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Originally Posted by Paul_E_D

call your engine guy, cause we're all just talkin smack!

Wise words.
I live on the edge. I'd go for it if it were mine.

**Kurlon** · 09-29-11, 02:10 PM

Looking at the parts fiche, I see ball bearing assemblies between the cam and the tower setup. The whole tower comes out...

Just replace that tower with your spare and run it as long as you don't have excessive slop.

**Degsy** · 09-29-11, 02:25 PM

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Originally Posted by Kurlon

Looking at the parts fiche, I see ball bearing assemblies between the cam and the tower setup. The whole tower comes out...

Just replace that tower with your spare and run it as long as you don't have excessive slop.

THANK-YOU!

**Paul_E_D** · 09-29-11, 02:27 PM

Originally Posted by Degsy

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Wise words.
I live on the edge. I'd go for it if it were mine.

I fixed my cam cap with JB weld and have been running it all year!

Of course, it was just the bridge that cracked, not the actual bearing boss. on an expensive head, I might err on the side of caution.

**Degsy** · 09-29-11, 02:27 PM

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Those honda heads are disposable cheap.

**tls25rs** · 09-29-11, 03:02 PM

Originally Posted by Degsy

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Those honda heads are disposable cheap.

Originally Posted by csmutty

And yah, I have $1200 into this head so replacement isnt really an option.

Apparently not this one..................

For what it's worth If it were mine I would try what Degsy and Kurlon are saying. Swap in the spare and make sure nothing is completely out of the ordinary with the cam and give it a go.

Joel

Is the item in question item number 2 on the following micro fiche? I know it may not be the correct year (I took a guess that all the CRF450R heads were similar).

http://www.ronayers.com/Fiche/TypeID.../CYLINDER_HEAD

Part number 12240-MEB-770

If so, then I would definitely try the spare. They sell them individually not as part of the complete Head so they must be interchangeable between heads and the dowel pins on the bottom line them up to the head. Please let me know if that doesn't make any sense.

**Pittenger5** · 09-29-11, 03:07 PM

Buy my Rmz

**csmutty** · 10-01-11, 06:08 AM

Originally Posted by tls25rs

Apparently not this one..................

For what it's worth If it were mine I would try what Degsy and Kurlon are saying. Swap in the spare and make sure nothing is completely out of the ordinary with the cam and give it a go.

Joel

Is the item in question item number 2 on the following micro fiche? I know it may not be the correct year (I took a guess that all the CRF450R heads were similar).

http://www.ronayers.com/Fiche/TypeID.../CYLINDER_HEAD

Part number 12240-MEB-770

If so, then I would definitely try the spare. They sell them individually not as part of the complete Head so they must be interchangeable between heads and the dowel pins on the bottom line them up to the head. Please let me know if that doesn't make any sense.

Yes that is the part. And that makes sense. I will order the dowel pins and put the spare on. The cam bearings are new as of the second race weekend so those should still be fine. Thanks!

And yes Gino, I am thinking that this is why my bike was running like crap and would not start on Sunday, as my valves are in spec.

**Degsy** · 10-01-11, 08:20 AM

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If your valves are in spec with that crack in the cam tower, your valves aren't gonna be anywhere near in spec with the new cam tower.

**csmutty** · 10-01-11, 08:23 AM

Originally Posted by Degsy

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If your valves are in spec with that crack in the cam tower, your valves aren't gonna be anywhere near in spec with the new cam tower.

There is no force on the cam tower when at TDC, so I am thinking it will be the same? I think they would go out of spec when the cam is pushing on the valves right?

**Kurlon** · 10-01-11, 09:43 AM

All it would do with that crack is reduce your lift/duration slightly... I don't think that's why the bike wasn't starting. If anything it'd start easier with more compression...

**Degsy** · 10-01-11, 11:05 AM

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I meant when he puts the new tower on.

**csmutty** · 10-01-11, 11:35 AM

Ok everything is swapped over to the new tower, just have to go get assembly grease, seem to be out.

**csmutty** · 10-13-11, 07:57 PM

Ok just an update I got the bike running. The problem actually wasn't the cam tower. Corrosion and other junk actually made it's way into the hot start in the carb and made it stick open. Cleaned it out and put it back together, and voila! It runs!

Oh yeah. And I brought the bike to my "mechanics" house and he was revving it on the stand to diagnose it when I saw the swingarm bolt backing out. The bolt SHEARED! Like the end with the nut broke right off. The only reason it did not come out while i was racing was because the end hit the rear brake pedal.

**Paul_E_D** · 10-13-11, 08:01 PM

Stay on top of that shit. This is why I carefully cleaned my racebike often. Good chance to inspect and find crap like that. We push these thing to the limit.

**csmutty** · 10-13-11, 08:04 PM

Originally Posted by Paul_E_D

Stay on top of that shit. This is why I carefully cleaned my racebike often. Good chance to inspect and find crap like that. We push these thing to the limit.

Good advice. I will be staying on top of it. Thanks.

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