250-500cc Just bought a 2014 WR300. What carb/jetting?

First off I'd like to introduce myself. I'm a long time MXer and Cross Country racer. I just came across a deal I could not pass up on a 2014 WR300. The bike has never been ridden in the dirt. I have been reading a great deal about these bikes and it seems like the jury is split between the JD jetting kit, Lectro carb, and Kehin Airstriker. I am located in central Oklahoma and my normal elevation is around 1050ft. However, the main reason I bought this bike was for our annual trip to Colorado. While on the trip we see a base elevation of around 8900 and a peak of around 12,300. What would be the best setup to handle both of these changes? I should probably ask: if any of you regularly ride at high elevation, what is your setup and are you happy with it? I don't want to spend the $$ on a JD kit if I will not be able to make the machine happy at elevation. I would prefer to just rejet the stock carb or use the air striker. I have installed an airstriker on a 2003 Honda CR250 with great results so I'm leaning that way currently. Help me change/make up my mind.


I appreciate the help

PD

I was concerned about fitment as putting Keihin on my old Honda CR wasn't very clean. I dunno how JD would do at your elevation but I live at sea level and rode up to 5,500 elevation yesterday. Following JD's guide I was good but a smidge too rich (based on spooge and less than clean off idle). One needle clip higher and problem was solved. The mikuni TMX has a better top end pull than the Lectron IMO but plenty down low for grunting around alpine mtn trails.

I had an 09 WR 250/300 with a modified Mikuni TMX. I could never get to idle right but it did have a good mid range and top but most my riding was just off idle. I ordered a 36mm Lectron and once I learned to tune it my bike ran better than any 2t I've ever owned.My rides start at 1000 ft and go up to 5800 ft ant the bike idles and pulls from a lower rpm than the stock carb. When I sold the bike the carb came off and went on to my new Beta. Even the guy who bought my old bike ended up buying a Lectron for it and is satisfied with the results. I'd put my money on the Lectron every time because that's what works for me....

Kelly what sort if mpg you get on a 250/300 at east fort rock? My tmx with jd and adjusted float got 33 mpg but this is a highly unusual style of riding for me. Ride taneum last weekend with one clip richer on needle (mistake) and got 26 mpg which is more indicative of my typical riding terrain.

What Kelly said(& 454X) will never have a 2smoke without a Lectron.....

The way I see it is you really only have 2 options:

1. Try the JD kit for the stock Mikuni, knowing that that carb can be very sensitive to temperature, humidity and elevation.
2. Go with the Lectron (I would go for 38mm).

Spending money on the Keihin, at this point in the carb wars, just is silly to me. I've got one sitting in a box somewhere, along with an R&B modified Mikuni. Neither of those setups satisfied me. But the Lectron experiment was just getting started. I picked up one of those early on and wouldn't go back. I've got one on my brother's WR144 now as well. So, yeah, it's 2 options, try the JD kit and maybe be happy, or try the Lectron and maybe be happy (there have been a few who didn't like them).

Personally, I would just go ahead and order a Lectron and be done with it.



Will you be racing the BJEC at the Stillwater 500 on the 22nd? If so, I plan to be there, and you could give my bike a test ride, but as fair warning it's a CR250 at the moment.

How does the Lectron stack up as far as size, front to back? Is it much longer than a Mikuni like the Keihin is?

its about the same i would say, I had no problem fitting one on WR300.

Nope, they're machined to match the size now. I have the pre-machined version and it seems easier than the Keihin was to mount, but is still slightly longer than the Mikuni. Kelly probably knows the specifics, but I only had issues when I switched shock springs. As the Racetech one I put on is larger around than the stocker. I usually have the whole subframe pulled off when I remove the carb though, because it means I'm pulling the engine. No need to remove it to adjust the rod.

I measured my newer lectron to the older one 86mm v 93mm. much better fit.

I read all these stories on bikes out here and just dumbfounded ... I've got a 1 kick starting, 250cc 08 WR250cc Husky ... Its screams in what I'd call 2t fashion. Apparently, the only ~perfect ~stock bike made

Good luck with your bike ...

Yep and every new bike is gonna need some re-jetting ... I go from 0 to 3,000' sea-level and no real issues ... I'll see what is in my CARB if I remove it again ...

Probably a good thing on the new bikes as all these older bikes are still being sold and should last quite a while into the future from the purchase yr ...

I"m running the original TMX on my bike and it screams. But I have had some episodes where it acted funky. I tried the PWK, didn't like the fit and never got done jetting it before returning to the TMX. I do have my eye on the Lectron if need be. Sounds like a winner!

Thank for all of the opinions guys!!! I went with the JD jetting kit for now after spending some time on the phone with them. I am going to give the stock carb with JD jets a try this year in Colorado and see how it does. I will be taking a few extra bikes with me that have all made the journey before and I know how to jet them. If I can't sort the new husky I'll pull the old bike out a run it. Looking forward to learning more about these bikes and getting it set up for my height/weight/riding style

Just my $.02, I use a JD kitted tmxx. I liked it better than the PWK I borrowed for my riding, high speed dessert trails. In fact I finally geared it 14X47 to get it where I liked it. I get 50+ miles on stock tank without hitting reserve. So for my style I like the Mikuni. That being said the one time I went rock crawling, between the dragging clutch and the carb not idling well, I might have called her a bad name or two. That's just not the normal riding type for me. The bad thing about high speed dessert is I ran out of talent in January and broke tib, fib, and ankle. I miss riding. Maybe soon