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Old 02-12-2019, 06:58 AM   #16
ratsblast
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I didnt realize those engines are real fire breathers; guess the old addage cheap, reliable, powerful: choose two, applies. Good luck with it.
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Old 02-12-2019, 07:13 AM   #17
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I bet if you wanted to run it longer you could get away with a quick and dirty deburr before doing it right at a later date. How much more will the cam chew into journals, the damage is already done. Wonder if the journal could be knurled into spec? Just thinking.
when you do things like that on modern 4 stroke dirtbikes (which an 03 WR450 qualifies as for this), things end up costing you way more than doing it right
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Old 02-12-2019, 07:25 AM   #18
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I didnt realize those engines are real fire breathers; guess the old addage cheap, reliable, powerful: choose two, applies. Good luck with it.
they're fairly reliable if you maintain them right

if you screw up and overtorque a cam cap, I'd expect problems like this on most vehicles
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Old 02-12-2019, 10:22 AM   #19
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Those look absolutely terrible! I'll bet the cam is toast as well.

If you get it machined and repaired, or if you get new replacement parts, BEFORE you put it all together again, burnish the cam journals with molybdenum disulfide or tungsten disulfide powder. Spend some time and really burnish the stuff in well. Same with the bucket wear surfaces, top where the cam contacts, sides, and bottom where it contacts the valve or shim. And the cam as well, all bearings, all lobes.

The two materials (two lazy to type them out again) I mentioned are sub micron size dry lubricants that work their way into the pores and micro scratches in the metal surface and stay there, providing superior lubrication and protection. Both of those materials can take incredible amounts of both pressure and heat. I would never build an engine without the stuff. You can find either on Amazon. You can also make your own paste by mixing the pasted with some quality full synthetic grease. Ratio 60/40 or 70/30 powder/grease. After burnishing the material in, use a quality assembly paste that has moly in it as well.

FYI, machining the caps and then align boring the journals will lower the cam a bit and the cam timing will change a bit. I don't know if this will be a problem. The difference may be minor or not.
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Last edited by ST Guy; 02-12-2019 at 10:24 AM..
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Old 02-12-2019, 11:59 AM   #20
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I took some more photos to shoot to Engine Dynamics.

20190212_070007 by James LaBarge, on Flickr

20190212_070033 by James LaBarge, on Flickr

Here's hoping for a miracle.
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Old 02-12-2019, 12:07 PM   #21
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do I see damage on the lobes or just some dirt?
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Old 02-12-2019, 01:34 PM   #22
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Just take it all to them and let them get fingers on them and they will tell you exactly what is needed or not.
Internet mechanics and photos have gone as far as they can.
Let the pros hold them and check them out and get it over with.
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Old 02-13-2019, 12:45 PM   #23
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There's something going on there, I don't think it is cam holder bolts. More like old oil or the motor got too hot.
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Old 02-13-2019, 02:47 PM   #24
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There's something going on there, I don't think it is cam holder bolts. More like old oil or the motor got too hot.
Could be, but there is a lot out there on the internetz about this exact thing happening to YZs and WRs of this generation.
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Old 02-13-2019, 03:30 PM   #25
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Quick synopsis of the internet search:

A: torque specs are critical to the cam caps, especially with these motors. It was the first time I pulled the caps, but I had to put a solid hit on each to get them to break.

B: the oiling system may be a bit light on the intake cam. According to 1 shop that works on these heads, its the last to get oil.

Engine dynamics hasnt gotten back to me yet, but after considering the potential of lowering the cams and the limit of what they can clean up with machining down is .001". I found a used head off a running yzf450. I am going to install the wr450 exhaust cam and run it.

I am going to take a real close look at the oil paths to make sure they are flowing as best as they can.

I really appreciate all the information that was shared. Everytime i go through the Garage, I get a little bit smarter.

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Old 02-13-2019, 04:20 PM   #26
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I thought that the exhaust cam was the same other than timing, and a very common upgrade on WRs was to swap it to YZ timing
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Old 02-13-2019, 05:49 PM   #27
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The YZ cam is the common swap. The YFZ is a bit different (Typo in the previous post). Built to lug a small car around. With this head, I will have the option to mess with it. But, I am going to start out with the feel that I know to make sure the bike is running again.
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Old 02-14-2019, 07:05 AM   #28
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I interpreted your statement of YZF450 as meaning YZ450F rather than YFZ450

you got a quad head? are the ports the same?
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Old 02-14-2019, 10:39 AM   #29
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did you change your oil often?
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Old 02-14-2019, 06:07 PM   #30
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Yeah, constant oil changes. I haven't dropped the oil yet, but I will post on it's status. I run full synthetic 10-40 in all the bikes.

And the quad used the same motor for 4-5 years. It has been super useful as those guys wreck them left and right!
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