2012 yfz450 new valves too tight! - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
 
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post #1 of 10 (permalink) Old 05-24-2019, 06:50 PM Thread Starter
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2012 yfz450 new valves too tight!

So I'm at a loss right now. I have a 2012 yfz450 (carburated version). Long story short, my head and cam holders were mushroomed out where my cam journal sits. I replaced the piston, rings, brand new head and cam holders, new valves and springs, new timing chain. I lapped the valves and made sure they were seated correctly. Put the motor all back together, and started out with the smallest shims in my shim kit which is a 1.20. The only valve I can fit my smallest feeler gauge into is my center intake valve which is 0.001 in. I have rebuilt motors and adjusted valves many times. I have checked the timing multiple times and even looked at forums, watched videos just to triple check I am doing it right. I measured my cam journals to make sure they are not worn, but they seem to be within spec, but that's the only thing that is not new on this top end. I am just at a complete loss right now and any help would be greatly appreciated. My next step would be to buy new cans and try them, but really don't want to spend another couple hundred on this motor and that not be the problem!
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post #2 of 10 (permalink) Old 05-25-2019, 08:05 PM
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titanium valves?
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post #3 of 10 (permalink) Old 05-26-2019, 01:05 PM
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Did you make sure the shims are sitting down into the spot they were meant to before you put the caps on? Start by making sure the caps sit lower than where the cam mounts. Sounds stupid but I’ve seen even more stupid mistakes.

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post #4 of 10 (permalink) Old 05-30-2019, 07:53 PM Thread Starter
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They are not titanium valves, I used to race an 06 yfz that had titanium valves and knew not to lap them. These are kibblewhite stainless steel valves.
I had the cams and shims out multiple times to make sure the shims were sitting properly and even cranked the motor over by hand multiple times to make sure the buckets were not sticking to the cam lobes for some odd reason. This isn't my first rodeo....just my first time being completely stumped! Lol. I went and ordered the cams in Hope's that will fix my issue. Thanks for the brainstorming though. Much appreciated!
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post #5 of 10 (permalink) Old 06-15-2019, 04:07 PM Thread Starter
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So if anyone is following along...I finally got my new cams (rocky mountain took their good old time and took 3 weeks to get them to me) installed them, and still no valve clearance. I gave in and removed the head and valves and compared them to my old valves. (All still in baggies and labels where they were taken out of). So my new valves are all 1.7mm to 1.95mm taller than my old valves. I guess I found my problem. I was just wondering if anyone has ran into this issue before. They are kibble white valves
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post #6 of 10 (permalink) Old 06-16-2019, 09:17 AM
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Did you buy cams for a 04-08 or 12-13? The 12-13 models used different cams with shorter valves. The heads are the same but you have to use the right cams with the right valves.
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post #7 of 10 (permalink) Old 06-16-2019, 05:20 PM Thread Starter
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I ordered everything for a 2012 yfz. I'm wondering if they sent me valves for the older version. I threw all the packaging out for the valves, but all my receipts say for 2012. I'm just going to get OEM valves tomorrow and go back to arguing with rocky mountain and try and get my money back for the kibblewhite. I have never had a rebuild take me this long before and it's all due to rocky mountain. Sent me the wrong cam chain, took 3 weeks to get me my cams and now finding out they sent me the wrong valves! Not to mention this huge headache of troubleshooting all of this crap!! Looks like I need to start ordering parts elsewhere. Wish I had a Yamaha dealer closer than 40 miles away
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post #8 of 10 (permalink) Old 06-16-2019, 05:29 PM Thread Starter
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Hmmm... so I just checked the rocky mountain site and compared part #s with 2012 valves vs the 2006 valves and they are the same part numbers. Are you positive they are different lengths? I'll have to rummage through my old parts to see if I have any old valves from my 06 to compare it to
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post #9 of 10 (permalink) Old 06-16-2019, 06:41 PM
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2012-13 steel valves
1PD-12111-00-00
VALVE, INTAKE
19.49 1
2
1PD-12112-00-00
VALVE, INTAKE 2
18.99 2
3
1PD-12121-00-00
VALVE, EXHAUST
29.99 2

2004-08 titanium valves
1
5TA-12111-00-00
VALVE, INTAKE
102.99 1
2
5TA-12112-00-00
VALVE, INTAKE 2
99.99 2
3
5TA-12121-00-00
VALVE, EXHAUST
108.99 2
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post #10 of 10 (permalink) Old 06-17-2019, 10:24 AM
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Xceldyne valves are the only ones that you should consider.

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