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Yamaha MX & Off-Road Dirt Bikes
'01 WR 250F Questions????
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[QUOTE="wrooster, post: 92869, member: 21800"] [b]wr250f mods summary[/b] the snorkel is not the anti-backfire screen behind the air filter. on usa WR's, at least, underneath the seat there is 1) a "cover" with a square cutout screwed to the top of the airbox and 2) a flanged square "tube" screwed to the cutout of the aforementioned cover. the "snorkel" refers to the flanged tube; but most people, when they say "remove the snorkel", they mean remove the flanged tube AND the cover. this is done in one step by removing the four screws that hold the cover to the airbox. doing so lets you fully see the air filter mounted in it's glory, a la the yz250f. i second the opinion of *NOT* removing the screen behind the air filter, that could lead to trouble (like an airbox fire in at least one case) and besides it's not hurting power. one thing you probably want to do when you remove the airbox cover and snorkel is put on the "rain flap" that came with your bike's kit; that flap will keep water from running down your gas tank and into your airbox. i had to cut mine out a little bit -- i think it was designed for the yz250f and the wr has some additional stuff in the way (e.g. rear coolant reservoir hose and tail light wiring harness) -- but it will fit. for reviews on the wr250f, check the last couple of months of dirt bike magazine etc. (april has a full review) , and online search the archives at [url]www.motorcycledaily.com.[/url] ah heck, here you go: [url]http://www.motorcycledaily.com/03feb01wr250freview1.html[/url] [url]http://www.motorcycledaily.com/04march01wr250freview2.html[/url] for other mods: 1) throttle stop-- all usa wr's come with a throttle stop that limits the carb slide opening, and therefore limits engine power (this is evidently done to meet some noise or emissions spec). wr400f/426f owners know all about this. wr250f owners have to learn. basically the fix consists of cutting off a couple of mm of the throttle stop, so that the length matches the yz250f stop. a couple of months ago i did a "how-to" write up on the throttle stop mod, see [url]http://www.thumpertalk.com/ubb/Forum10/HTML/000207.html[/url] and scroll about halfway down to my post of 03/09/2001. 2) exhaust baffle-- the stock exhaust baffle is very restrictive, leading to power loss (but to give it some credit the stock baffle also *very* quiet). removing the stock baffle restores power but the sound then assaults your and others eardrums pretty bad-- uncorked it's louder than a yz250f. there is a middle ground however, i.e. good flow plus less noise --> the baffle i'm using is the "Vortip" replacement insert from [url]http://www.finelinesuspension.com/[/url] originally it was designed for the wr400/wr426 but it fits the wr250f just right. much less backpressure (=more power) than the stock insert and way way less noise than wide open. it takes 20 seconds to remove the old restrictive baffle and 20 more seconds to put the Vortip in. just 1 bolt on the tailpipe is all. 3) handguards-- so far the only other major mod that i have done is the addition of some "real men's aluminum"(tm) bark busters (actually cyrca pro bends from yamaha GYT-R, including the triple clamp mounts), read up at [url]http://www.thumpertalk.com/ubb/Forum10/HTML/000361.html[/url] and check the notes at [url]http://www.thumpertalk.com/ubb/Forum10/HTML/000458.html[/url] 4) oil-- as for the oil, i too have an '01 wr250f, rec'd in february. i used yamalube 4 (dinosaur oil) for the first two oil changes, then i did one change with yamalube 4R (semi synthetic), and then i settled on mobil 1 15w50 full synth (non-EC, the RED cap). why this trip? i don't know. i figured i'd seat the engine internals with dino oil, then migrate to semi-synth, then feed it pure synth. i have no technical rationale for this except that it seemed like a good idea. i know some people run dino oil forever (castrol makes good fossil stuff) and others who run synthetic from day one (amsoil, red line, or mobil etc). my take is that the frequency of oil changes is far more important than the marginal differences in oil quality. a couple of guys i know have been racing their wr400f's with mobil 1 for a couple of years now and haven't had problems. 5) yzf timing-- soon to come, everyone seems to like it and it appears that it can be done in an hour so no big deal there. check out [url]http://www.thumpertalk.com/ubb/Forum10/HTML/000457.html[/url] for some info from folks who have already done it. in addition, one of the dirt bike rags had a couple of photos on the process, someone can tell you which mag and which issue. the wrooster [/QUOTE]
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'01 WR 250F Questions????
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