valve adjustment?

[tonymtona]

Originally Posted by Woody_393

Yes the shims are what adjusts the clearance.

So if your clearance is too tight, you want a smaller shim so it makes the size of the gap bigger.

you are simply measuring the distance between the cam and the top of the valve bucket. When you check it, you can't even see the shims due to the bucket being over the top of them.

i think im gonna try to do it myself i kind of think i have the hang of it, another member gave some charts that said those were the valve and exhaust clearance measurements and i believe the desired shim measurements were on there too but i dont see how...you guys probably think im dumb lol..im going to try to post them up

[tonymtona]

well i cant the chart to upload i dont know why but if you guys get the chance go to this [Only registered and activated users can see links. ] and on chapter 3 pg. 23 is where the chart is at

[tonymtona]

new shim size = (measured clearance-desired clearance)+ existing shim size

example: new shim size = (.12mm-.15mm)+ 1.72mm

wich results in new shim size of: 1.69mm ... so that is the formula ive got in the video you showed me about checking the yz250..but im wondering if its wrong because when you subtract .12 and.15 you get.03 so your not gonna add that with 1.72 your gonna subtract to get the 1.69 right? so thats why im thinking that vid might be wrong...i called my local yamaha dealer ship and said that i would have to buy the shim kit that they dont sell them separate

[Woody_393]

Here this will make your life easier

4-stroke Valve Shim Calculator (Excel)

[tonymtona]

hey woody those links that you posted up there were they suppose to take me to a page or something i didnt take me anywhere but a forum where you put down some sentences

[Woody_393]

There should be a box that will let you download the files that are attached.

[Florida 393]

Tony,
I have the Powersports DVD for Yamaha Genesis head (426 off road) valve adjustment procedures. If you want it it is yours. Just P.M. me where to send it. They were sponsors here for a short while and I got everything they had relared to the 400/426/450 lines. I don't need it anymore since I pretty much have this operation down now. Let me know, please.

Bill

[Florida 393]

Tony,
My DVD (not a VHS as I had thought) got broken. No idea how. If you want I'll order a new one and have it shipped direct to you. Let me know. My apologies for this screw up on my part. I should have checked its condition first.

Bill

[Oklahomarider]

Hey Woody, did you notice who posted the links on the other site that Tonymtona was using for his 426.

[Florida 393]

Those tech posts were/are a part of Garrett's website. TT has kept the site hosted and linked through their portal for all to enjoy and use. Garrett's spirit still guides and helps people.

Bill

[marco250f]

When checking valve clearance does the engine have to be warm? Do i have to warm it up 1st before checking the valve clearance?

[Woody_393]

No, in fact it should be stone cold.