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Top End Rebuild

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When it comes to motorcycles, i think im really slow. I cannat for the life of me even begin to understand how to rebuild the Top End on my 2004 crf250x.

The problem is, i want to, really bad, there isnt anything more i would like to accomplish then to learn how to work on a dirtbike, my dirtbike. I have posted at least 5 different threads with similiar topics, and for this i am sorry, but i just dont get it. So first off, i think i need to stay away from "any info will help", because random info just confuses me. Secondly, if anyone wants to give me a detailed list of the parts i need and the procedures to follow go right on ahaed, but i know this is unlikely. So most of all, i am just asking for any possible sites or links anyone knows of that has deatailed procedures of a top end rebuild, even more specific, for a 2004 CRF250X.



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I hope this helps: http://www.thumpertalk.com/forum/showthread.php?t=603090

Yours will be a little different because Honda's and Yamaha's differ in design, but the basics are the same. The biggest difference is that Honda's have one cam instead of two. Other than that they are pretty much the same. A good manual specific to your bike is key to working on a bike as well.

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Here is a detailed parts list that I have posted in a different thread that a few people have found useful

FactionMX SS Intake Kit: as low as $154

OEM Exhaust valves: $75

4 Stem Seals: $22

2 Spring Retainers: $13

2 Exhaust Springs: $11

8 Valve Cotters: $22

Valve Seat Recondition: $65 (mxtime.com)

Head Gasket: not sure

Total: about $360

You may also need new valve guides but let them check before you buy them.

Also you may need a new piston and at the very least new rings. You can get an entire piston kit on ebay for $86 which includes the piston (12.9:1), rings, wrist pin, and cir clips. http://cgi.ebay.com/ebaymotors/PISTO...hippingPayment

Another thing that is a wise idea to replace is the timing chain which is about 25-30 bucks

When you get the head back bolt it on, shim it up to spec and your good to go

Here is a link to instructions on how to do a top end


Here is how to check and shim your valves


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