KX Riders
Maintenance & Technical => KX250 / KX125 => Topic started by: chap on January 08, 2007, 12:26:56 PM
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I have an 07 kx250 and am converting it too a woods bike,not that it needs much,i am lovin it.I owned an 02ktm400exc before.it was good but it was heavy and i wanted to ride another two stroke off the fourstroke bandwagon for now anyway.I am curious as to what mods you kx guys use to improve this bike for the bush,i would greatlly appreciate the imput.CHUCK
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I ride mostly tight single track with some fast sections in there.Lots of rocks,roots,hills,mud dust,we have her all up here.
The only thing i have done so far is install a 11 ounce flywheel weight,other that she is bone stock.
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your on the right track... i have yet to ride the 07 250, how do you like it? it looks like a great handling bike
gearing is the first thing you should do, try to gear so you almost top the bike out as a general rule,
also the ferther away your timing is BTDC the more low end power you can pull
i have been a fan of increasing compresstion, it gives you a ton more low end power as well as power through the rpm range. the down side is it is more dificult ro start and it will create more heat (this is when 83-1010 is great! it can lower temp. up to 50deg.)
enjoy your new bike!!
~steve
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is when 83-1010 is great! it can lower temp. up to 50deg.)
oops....i hate it when i talk/ type in part numbers... BTW that is WPS # for "Engine Ice" i just get soo excited about bikes...sometimes i even forget about the MRS...
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Two things I think can really make the KX woods friendly. The 1st, I think most here would agree, the best change you can make is to add a flywheel weight. It really tames the "hit" and gives you a better spread of power (I have an 11 oz weight). The 2nd in my opinion, it to adjust gearing. (I dropped a tooth on the front sprocket, and went up one in the rear.)
I ride with a lot of quads. Its usually slow going, 1st-2nd gear most of the time. To make it easier on me, The bike is like a tractor. It can be lugged through the tight technical trails, but also is a blast to go hill climbing, it just keeps on going... Due to the gearing changes, I wish it had a 6 speed tranny, as I've lost some top speed, but I'll take the power at the bottom vs. top speed. I don't need to go 100 mph anymore, I'm to d**n old, and it takes a lot longer to heal when something goes wrong...
My son likes the changes so much, he's taken over my 250. :cry:
Another thought... Guys correct me if I'm wrong, (like that's never happened before) but I believe the FMF fatty pipe will also add to the bottom end.
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I just added a 12 oz. flywheel weight and it's one great investment. My '02 250 came with a PC Platinum pipe that's more of a mid-top end pipe. But with 13/50 gearing and the FWW it's like a tractor. Can't stall the thing.
Personally, I don't think pipes make a HUGE difference. I'd toss money at a skid plate, hand guards and other woods bling before I bought a pipe.
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So far i love the bike steve,i dont have to many hours on it but i have raced her a couple of times(hare scrambles)and it works well.It is like riding a mountain bike compared to my ktm and i dont get as tired riding it.I did have a rekluse clutch on the ktm and i did like it,i may put one on this bike too.
I owned a 2001 kx250 once and this new one feels so much better,more stable,nicer power and the layout just suits my height and weight better.For now i have the suspension set up pretty well for the bush,surprisingly well for motocross suspension,i am impressed to say the least.With more time on it i might get both ends revalved,for now it is good.
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I also have a 07 KX that I turned into a woods weapon...list of mods
IMS 3.0 gal tank
Bark busters
Skid plate
Raditor Guards
Trail Tech Kickstand
FMF Gnarly and "Q"
Stealthy 13oz flywheel weight
O-Ring Chain
Re-Jet
Re-gear
Future Mods:
Suspension for aggressive woods riding
Rukluse Clutch
Two days after I got it...
(http://snowman.smugmug.com/photos/82577390-M.jpg)
Last weekend pic...behind my son's KX65
(http://snowman.smugmug.com/photos/120214173-M.jpg)
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Your bike looks great,is that your boys 65 also.My boy also has one,he is 10,little bugger is starting to fly,gonna make the old boy look silly soon.We both along with my 8 year old race harescrambles.Great familly fun if you ask me.Do you like the pipe and the q silencer you put on there,what effect does it have from stock,better,worse,same?
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Yeah thats my sons 65, Santa got it for him this past Christmas...he's 8 and also has a KLX110 that we are gonna sell in the near future. As far as the pipes I love the Gnarly pipe gave me tons of low-end but it did take a little from the top which was fine with me...I hate the "Q"....way to long and had nothing but problems with Jetting...fouled plugs every ride. I went back to the stock siliencer and haven't fouled a plug since. I came off a 05 CRF250X and I love the KX250...thing screams when I want it to, it's tons lighter and it just feels better in all around riding postions. Not only that but the "fun" factor came back, I'm always smiling when I ride it...lol I don't race right now but I plan on doing some woods races this coming year, my son races but nothing serious yet, he just loves to ride.
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I would do everything ssmokem did except for the kickstand (i dont like them) and the Q. Just me. The re-valve would be really handy. Also, if you get the gnarly and hear a vibration/humming sound in the high rpms, do not worry about it.
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I would do everything ssmokem did except for the kickstand (i dont like them) and the Q. Just me.
I agree on both but the kick stand is a must have when you ride with little guys...I was tired of laying the bike on the ground or finding a tree to lean it on when my boy took a "digger". The father in me just wants to make sure everything is ok with him and to heck with my bike....lol so the kickstand was a must. And again I hate the "Q" waste of $130 bucks if you ask me...looks like a bazooka hanging off the back of my bike...lol
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I'm with you on the kickstand for the same reason. Now that I have one, I'd never do w/out. Such a convenience.
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Also don't forget about some Vforce reeds. For woods riding on a 250 the extra bottom end they produce is nice. Here is what I would add:
Skidplate, hand guards, fork upper guard, rad guards.
Terrain specific tires
lower the gearing a bit (not too much)
bigger tank
Flywheel weight
Vforce reeds
Gnarly pipe (and guard)
Cam.
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I hear alot about these v-force reeds,what about the boyseen reeds,i have used them with good results and if i recall they are much cheaper,just the reeds i think,not the whole reed cage
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I run the dual stage boysens in my bike. Very happpy with them and the extra low end power. The V force do make more low end power, but then cost quite a bit more. The boysen dual-stage reeds are a great low-cost alternative to the V force. Cam.
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I also run the boysen reeds, the pro series. They added a little more bottom and smoothed the throttle out.
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I am thinking i am going to go with the boysen reeds,for about a hundred bucks less i think they r the better deal.Thanks for the input gents
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also the ferther away your timing is BTDC the more low end power you can pull
how do you retard the timing for woods riding?do you use a timing light what is the process and were do you want the timing?
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SSMOKEM, which brand skid plate did you buy? Do you have a glide plate or a skid plate? I recently bought a new 2005 KX250, and I am looking at some options on various woods related products.
Has anyone seen any guards for the upper fork tubes?
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SSMOKEM, which brand skid plate did you buy? Do you have a glide plate or a skid plate? I recently bought a new 2005 KX250, and I am looking at some options on various woods related products.
Has anyone seen any guards for the upper fork tubes?
I run a MSR skid plate with water pump cover and ignition cover protection. This thing is extra thick. Kxcam22, I think made some upper fork guards from PVC. Maybe he will log in and give us some more info.
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also the ferther away your timing is BTDC the more low end power you can pull
how do you retard the timing for woods riding?do you use a timing light what is the process and were do you want the timing?
Your stator plate should have timing marks located on it and on the crank case. Do you have a service manual for you bike?? Remove your ignition cover and look at the stator plate. It should have maybe one mark on it and three on the crank case. The center mark is standard timing and the upper mark is advance timing while the lower mark is re-tarding the timing, this is how I adjust the timing on my 500, check your service manaul if you have.
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I made my skid plate and my fork guards. The fork guards are made from PVC pipe from a plumbing shop. You could use ABS or any other plastic, the deciding factor was finding pipe with an ID that was slightly smaller than the OD of the upper fork tubes so that they snap on tightly. I cut about 1" wide slots to make it easier to snap them on. Mine are painted black with Krylon plastic spray paint. The paint has stayed on extrememly well (2 years now). A very successful mod. Cam.
PS there are some pics in my gallery.
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Many companies produce carbon fiber guards for the upper forks, they are light, durable and look trick.
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I got mine from E-Line. Fork and pipe protection. I tested the pipe guard, not by choice, and it did it's job very well.
http://www.elineaccessories.com/Shop/Results.asp?category=10&secondary=9&keywords=Pipe%20Guard&Submit2=GO
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I also purchaced a new bike once. The best thing I ever did was NOT TO MESS with anything. 98 KX 250, the most extreme part I had replaced was the fork springs. Engine/reeds/exhaust/jetting all stock. It becomes a Viscious Cycle once you start tinkering. Play with the sprockets/suspension/protection. The engineers behind these machines know a hell of alot more than we do. Do you want to spend money? or do you want to ride? That KX will eat up anything, any terrain you throw in it's path.
my $0.02
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I need a spark arrester for my 07 kx 250.Whats the best,quietest,easiest to install,cheapest.I want it all lol.Talk to me lol
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I race enduros on my 04 KX 250 which I bought as a leftover at the end of last year. I have done the following to it, these mods will apply to pretty much any bike.
Big tank, Clarke or IMS
V-Force
9 ounce Steahly fly wheel weight
Skid plate (when I go to the rock runs)
Hand guards
E Line pipe guard
WER steering dampner
WER suspension revalve
Lights
ICO Checkmate computer
Ive used both the FMF Q and the Pro 296 silencers, both are quiet but I had durability issues with several Qs. In my opinion, the PC 296 is the way to go.
FMF Gnarly pipe, I do have a discontinued Enduro Engineering low end pipe that I havent tried yet
Of course some stuff in my list are enduro necessities and not needed for woods riding or hare scramble competition.
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Thats Pro Circuit 296 spark arrester
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Thanks flyin hawaiian.I have heard the same about the Q.What if anything does the pc296 do to power,more less or about the same.Hey thanks for the info i really appreciate it man
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It seemed to smooth the transition from low to mid and maybe a little less overrev. I never rode my 04 with the stock silencer, I stuck the P/C on right away. On my 03, with the stock silencer it was pretty violent going from low to mid after the P/C the transition was smoother.