yz250f upgrades

[Grensjos]

i bought a 2004 yz250f this june, obvioulsy used
i am looking for some suggestions on upgrades
where should i start???
i plan on rebuilding my top end this winter>>> any suggestions as far as upgrades, as long as im in there???

 

[oldguy]

First thing is to get the valves replaced with Kibblewhite stainless steel. This will help ensure the life of the valve train for a couple seasons (as long as you do periodic clearance checks and adjustments). It wouldn't hurt to send the head off to a knowledgable engine builder such as Eric Gorr (altho there are many more in the area- I just prefer his work) to make sure everything is up to spec and maybe have him clean up the porting a bit.
The cam will probably also be pretty close to it's life expectancy so you may want to consider a hot cam.
Do not go cheap and leave the current timing chain in replacing it as long as the engine is apart is cheap insurance.
Waterpump should also get a good looking over as long as you are inthere.

Replace anything that looks at all questionable- nothing worse then putting it all together to have to tear it down a week later for something you thought would make do.

 

[Grensjos]

thanks oldguy...

i will keep this in mind when rebuilding this winter

Quick question>>>what should i look for when looking over the water pump????

also i am looking into aftermarket exhaust. slip on?? full system??? what brand??? looking to spend 3-4 hundred

 

[2 strokes for life]

Grensjos, for the water pump check the seal behind the impuler and check the impuller it self. A boyseen QUICKSHOT will help in keeping your new top end cooler. Also, an exhaust would be great for more power. In your price rang i might think a slip-on is best.