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2old4school

From TTR 250 to WR450...

8 posts in this topic

Just switched from TTR 250 to WR450 ('05). LOVIN' IT!! Not mechanically inclined at all, work done by local shop. Leanin' toward performance kit. Any and all suggestions will be appreciated. Also... TT after sitting for days showed oil on dipstick. WR shows dry until ran a bit. Gravity issue? Love this website! S. Cali area (Plaster City, Superstitions, Ocotillo Wells)

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Oil will drain out of the frame when the motor is off (it's only a dry sump when it's running). You are going to have to learn some mechanical skills (at least re-jetting, oil and filter changes, chain adjustment, etc...) but it is good for you. Performance kit? It doesnt really need things replaced to rip, it just needs 'uncorking' etc.

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Thanx Texas and Mouse. Broke out the manual and gonna start learning my way around the "blue meanie". This website gives a non-mechanic like myself the confidence to experiment and learn.

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Almost forgot... could you expand on "uncorking" ? Or direct me to a string that will explain it to me? I've researched the whole "gray wire" thing but haven't been convinced that it will make much diff. I'm not competing, but want the most "bang for my buck" !

thanx

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http://www.thumperfaq.com/sitemap.htm

This gives you info on free mods. Written for the 250 but, are good illustrations for all.

Your '05 will have variances to some of these mods.

In a nutshell here's the way I see it:

1. Throttle stop - when you first get your bike it's half throttle. Can't have that so, we change the throttle stop.

2. Gray wire - now that we have full throttle, our c.d.i. map is still mapped for 1/2 throttle. Can't have that so, we dis-connect gray wire (on the 05 it's in a six pin wire harness under the tank, right side).

3. Exhaust snorkle / Air box - now the bike needs to breath better so we remove the exhaust snorkle (take off the end cap, remove 4 bolts, re-install end cap) and open up the air box (remove seat, take out snorkle behind the battery. some people even cut out the holes on right side of air box, up to you).

4. Jetting/Fuel screw - once you get all this done you find out it's too lean. The 05 needle is non-adjustable and the fuel screw is blocked off and the jets are lean. Change needle to an adjustable type (jd or 04 model) pluck out the fuel screw blocker and change screw to zip - ty or the like. Up the jet sizes (main,pilot,starter, etc) to your elev and temp. Adjust fuel screw approx 1 3/4.

5. A.I.S. removal - lowedog kit - remove ais to rid the backfire on decel (after all these are done)

These are just basic mods to tune your new bike. Theres lots more you can do but this is a good start. Feel free to ask any questions you may have.

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On my 02 wr250 upgraded the cam and went with yz timing. Do I need to do something with a gray wire for the c.d.i. map? I have already changed the throttle stop.

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