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  #1  
Old 05-02-2004, 10:37 PM
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Question Valve adjustment on the YFZ 450??

Ok, I was reading another thread about valve adjustment (on the Z400) and this made me ask the question;

How often do you need to adjust the valves on the YFZ 450??:
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Old 05-02-2004, 10:41 PM
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Default Re: Valve adjustment on the YFZ 450??

I think alot of guys on the YZ450F adjust them every 6 months or so..or check them every 6 months I should say and adjust accordinling...I don't see why the YFZ would be any different...
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Old 05-02-2004, 10:47 PM
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Default Re: Valve adjustment on the YFZ 450??

I wouldn't touch them unless it's having a hard time with cold starting or are making noise. I haven't adjusted my YFZ that is 10 months old at all and it probably has over 100 hours on it.
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Old 05-02-2004, 10:48 PM
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Thumbs up Re: Valve adjustment on the YFZ 450??

Cool!

Thanks for the info!!
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Old 05-02-2004, 10:49 PM
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Default Re: Valve adjustment on the YFZ 450??

Well there ya go 2fun...if anyone knows...Woody does.
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Old 05-02-2004, 10:50 PM
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Thumbs up Re: Valve adjustment on the YFZ 450??

Quote:
Originally posted by MATTXR250R
Well there ya go 2fun...if anyone knows...Woody does.
Right!

Always good to hear from the guys here, and Woody especially since he owns so many!!
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Old 05-03-2004, 12:19 AM
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Default Re: Valve adjustment on the YFZ 450??

Once a year should be fine while you are doing your anual tune up.
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  #8  
Old 05-03-2004, 10:05 AM
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Default Re: Valve adjustment on the YFZ 450??

Quote:
Originally posted by MATTXR250R
Well there ya go 2fun...if anyone knows...Woody does.
Or he just makes it up. LOL
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Old 05-03-2004, 10:37 AM
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Default Re: Valve adjustment on the YFZ 450??

LOL Woody..I doubt that
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  #10  
Old 05-03-2004, 10:53 AM
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Thumbs up Re: Valve adjustment on the YFZ 450??

Quote:
Originally posted by hardlydangerous
Once a year should be fine while you are doing your anual tune up.
Thanks Hardley!

Always good to see you pop in for tech questions!


Woody;
You've already gone there and done that for many aspects (especially on the YFZ), so I trust your opinion on many ATV's.
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  #11  
Old 05-03-2004, 11:05 AM
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Default Re: Valve adjustment on the YFZ 450??

The better the oil and jetting the longer the valves will stay in adjustment.
I've got over 70,000 km on my VLX and has never needed adjustment since it's original adjustment after break in. I check it every year when I change my coolant and sync my carbs.
I have several friends that have me check there valves every 6 months or year on everything from dirt bikes to ATVs. The only ones that need adjustments are the guys that don't change their oil regularly or can't be bothered use a good synthetic. Or the guys running with the jetting out of wack.
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  #12  
Old 05-03-2004, 11:08 AM
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Thumbs up Re: Valve adjustment on the YFZ 450??

Quote:
Originally posted by hardlydangerous
The better the oil and jetting the longer the valves will stay in adjustment.
I've got over 70,000 km on my VLX and has never needed adjustment since it's original adjustment after break in. I check it every year when I change my coolant and sync my carbs.
I have several friends that have me check there valves every 6 months or year on everything from dirt bikes to ATVs. The only ones that need adjustments are the guys that don't change their oil regularly or can't be bothered use a good synthetic. Or the guys running with the jetting out of wack.
Thanks Bro!

When it actually comes time to adj the valves, I will be asking some questions here as I am a 2-stroke guy, and have never had to perform this task!:
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  #13  
Old 05-03-2004, 11:24 AM
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Default Re: Valve adjustment on the YFZ 450??

Well don't worry about it , it's an easy job.
Every engine is different but the procedure is always the same.

All you got to do is find TDC on the compression stroke.
Remove the valve adjuster cap on the head and the timing plugs on the engine and rotate the engine until the "T" lines up with the index mark. If either valve is open, rotate the engine until the mark lines up again. (With the engine at TDC on the compression stroke both intake and exhaust valves must all be closed and the rockers loose.
Now find out the specs of intake and exhaust valves, and check that the clearance is ok using a feeler gauge. If it's not simply loosen the lock nut and adjust the rocker so you can feel a slight drag on the feeler gauge. Then tighten the lock nut and move on to the next valve.

The most important thin about the job is, make sure the engine is cold. Let it sit over night and adjust the valves the next day

Just be thankful you don't own a Honda V4 or inline 4. The V4 Magna I just did has 4 valves per cylinder. The inline 4's use special thickness shims that you need to replace for every valve :
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  #14  
Old 05-03-2004, 08:45 PM
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Thumbs up Re: Valve adjustment on the YFZ 450??

Cool!

Thanks again bro!
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  #15  
Old 05-03-2004, 10:21 PM
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Default Re: Valve adjustment on the YFZ 450??

Right on. That's excellent information.
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  #16  
Old 11-02-2008, 07:53 AM
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can one of you guys help me out and give me the specs. i dont have a service manual
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  #17  
Old 11-03-2008, 12:43 AM
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Quote:
Originally Posted by chrisluke View Post
can one of you guys help me out and give me the specs. i dont have a service manual
Go here and you can download one for yourself.

[Only registered and activated users can see links. ]
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  #18  
Old 02-07-2009, 09:35 PM
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You've got to be kidding? I thought It was every 50hrs or mabye that was
after the first 50hrs. Anyway, what are some symptoms when it does start to need an adjustment?
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  #19  
Old 02-09-2009, 01:03 AM
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Quote:
Originally Posted by stillridin View Post
You've got to be kidding? I thought It was every 50hrs or mabye that was
after the first 50hrs. Anyway, what are some symptoms when it does start to need an adjustment?
If you start hearing noise coming from the valve train, or if it becomes hard to start when cold are a couple of symptoms that your valves may be out of adj.

I checked mine after about a year of use when doing the cam mod, and at that time, they were still ok.
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  #20  
Old 02-13-2009, 08:31 AM
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The YFZ does not need adjustment quite as often as the bike since it doesn't rev quite as high. I think 50 hours is probably sufficient unless symptoms mentioned above show up.
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