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Re: DIY XT-225 valve adjust [Re: RickMJr] #80452 04/21/11 04:05 AM
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OK, here's a new link to the PDF DIY valve adjustment instructions:
DIY XT 225 Valve Adjustment.pdf
Enjoy!


I'm so new...I don't know where to begin?
05 XT 225, devilman footpegs, magnetic drain plug, valves adjusted, pilot screw turned out 2 1/2 times.
Re: DIY XT-225 valve adjust [Re: RickMJr] #116888 10/07/13 05:28 AM
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nextlife Offline
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This is great, i'm going to do this very soon just one thing... really sorry for my ignorance but I don't understand one part in the instructions:

"these are the 3 radial groves on the flywheel, the one in the middle is top dead center (TDC), however a four stroke engine may read bottom dead center ( Iím not that sure about this statement). However, it is not important. What is important is to check the exhaust gap while you have the center groove visible. If you can get a .003" feeler gage in the gap your at TDC. If not rotate the flywheel another 360 degrees anti-clockwise and check the gap. This time it will be there. So, you have a 50/50 chance of getting it right the first time. By the way donít use the rachet function on your tool. Once you see the flywheel notches, just spin your tool one full revolution to see notches again!"

When I am rotating the flywheel and the three notches come into view, where am I using the .003" feeler gage? Is the exhaust gap you're talking about the hole with the flywheel? Can someone give me a little better instructions here - like you were talking to a baby. Would really appreciate it

Cheers
D


Be kind to everyone!
Re: DIY XT-225 valve adjust [Re: nextlife] #116968 10/08/13 05:48 PM
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American Greenz Offline
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2007 XT225:Z1,Coleman Seat,M-Wave on Immix Rack,Signal Beeper,127.5m/42.5p,Uni filter, Iridium Plug, Turbo City Windscreen
Re: DIY XT-225 valve adjust [Re: klm4755] #131509 04/18/16 12:39 AM
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Selden Offline
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Thanks to Keith, many years ago, for the excellent write-up. I got tired of chasing down broken links to PDF versions, so I downloaded the entire thing this afternoon, cleaned it up, corrected a few typos, and have made it publicly available as a PDF on my Google Drive space: DIY XT225 Valve Adjustment.

Access is set to anyone with the link, with no restrictions on downloading.

One additional comment: if you aren't practiced with using feeler gauges, a set of Go-No-Go feeler gauges can be a great asset.


Don't fix it if it ain't broke, don't break it if you can't fix it.
Re: DIY XT-225 valve adjust [Re: klm4755] #131514 04/18/16 04:18 PM
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Muniac Online Content
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Selden - Thanks for doing this. I appreciate the time and effort required. It's good to have people put something back into the site's information base. I can put a copy of this on the XT server so it remains permanent.


Evolve & Simplify
Be There or Be Nowhere! A Few Adventures & Video
Re: DIY XT-225 valve adjust [Re: Muniac] #131525 04/18/16 07:02 PM
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Selden Offline
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Originally Posted By: Muniac
Selden - Thanks for doing this. I appreciate the time and effort required. It's good to have people put something back into the site's information base. I can put a copy of this on the XT server so it remains permanent.


Putting a copy on the XT225 server would be great. While I think of my copy as "permanent," I could be run over by a SUV tomorrow. Institutional memory is always preferable to individual efforts.


Don't fix it if it ain't broke, don't break it if you can't fix it.
Re: DIY XT-225 valve adjust [Re: klm4755] #131548 04/19/16 07:56 PM
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OK I got a copy of it on my PC. Now I can upload it to the XT server and setup a link. Just need to know what credits to put there?? Thanks again.


Evolve & Simplify
Be There or Be Nowhere! A Few Adventures & Video
Re: DIY XT-225 valve adjust [Re: klm4755] #132861 06/30/16 04:15 PM
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cogitech Offline
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Thanks to all who have contributed to this set of instructions over the course of this thread.

I checked and adjusted my valve clearances last weekend based on this thorough set of instructions.

I am very glad I did this. The exhaust was at .009" and the intake was at .006".

Sounds way better now, and I am sure it runs better, too.


'06 XT225, 2" hole in airbox, Z1 mod, 127.5 main jet, UNI air filter, Corbin seat, PIAA 500Hz, custom aluminum rear rack.
Re: DIY XT-225 valve adjust [Re: klm4755] #135944 03/12/17 01:34 AM
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justin_lewis Offline
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Quick question. I just did my valve adjustment on a 2006...when you are finding TDC on my flywheel there is an elongated H like this (|--|) and then a space and one more |.

From reading through this whole thread I just want to confirm that TDC on mine is the second |. Not the middle |, which would be the second half of the elongated H.

Just changed the oil, put new valve o-rings in, and adjusted the valve. Hopefully leaving Guatemala tomorrow and heading towards El Salvador. Just turned 19,000 on my xT.

Justin


2006 Yamaha XT 225 - first bike
Re: DIY XT-225 valve adjust [Re: klm4755] #135946 03/12/17 07:47 AM
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patuca Offline
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Hi Justin:

On most bikes like XTs (rotor on the left of the engine) the rotor turns counter-clockwise and there are usually 3 marks.

As you turn the rotor CCW the first mark that lines up is the "full advance" mark. This is the point where the bike would fire at high rpms, and in this case the spark happens early (advanced) and well before TDC because the burning takes time and the piston is moving fast. The full-advance position is usually 20 or 30 degrees before TDC and if you put a timing light on as the engine was running, the light would strobe at that mark (or near) as the engine was revved.

As you turn the rotor further CCW you come to the "Static firing point" (sometimes marked "F" for fire) and this is the point where the ignition is advanced only slightly for idle speed or if the bike was timed not running (static timing) with a test-bulb or meter. This point is the left part of the "H". This mark is usually about 8 degrees before TDC and this is the maximum retarded position and the base setting for ignition.

The last mark (the furthest right leg of the "H") is the true TDC where the piston is at the very top and it is sometimes marked "T".

On CDI bikes the marks are mostly ignored because the timing is set by the stator position and CDI electronics. Most manuals specify setting the valves at TDC because it's an easy referance but anywhere close will work too.

I hope that helps...good luck in El Salvador.

patuca


"this will only take a second..."
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