Just switched from kx250 to kdx200

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Originally posted by farcry2
Besides removing the air box snorkel, what are the top 5 best mods you can make to this bike?

Click to expand...

1. heavier fork springs
2. fresh set of Pirelli's
3. aftermarket pipe
4. steering damper
5. revalve forks

JMHO; assumes basic maintenance & jetting is kept up, and you've already added some basic woods items - barkbusters, skidplate, FRP chain guide.

Follow this link off the main page:

http://justkdx.dirtrider.net/tech_tips.html

http://www.frpoffroad.com/index.php?page=kdxposed

Here's a few ideas.

Well how about these,
1 jetting
2 pipe
3 jetting
4 fork springs
5 jetting

o and dont forget the proper jetting.

Yes, its that good, it gets three out of five.
Steve

re: what are the top 5 best mods you can make

Numbers 1,3 & 5 O&S listed above fit into spots 1,2 & 3 in your top five list.

He's right.


Well, and don't forget proper jetting.

1. Jetting (yes, I know has been said)
2. Boyesen Reeds (cheap power gain)
3. FMF Gnarly Woods Pipe (must!)
4. Moose Torque Spacer Kit
5. FMF Q silencer/spark arrestor (drops weight)

That's all I can think of. Numbers 1-3 have made a huge difference for me.

Try a search on the subject and you'll find hundreds of references to jetting issues.

Start with CDave's site (http://justkdx.dirtrider.net..but matt already said that and you have it bookmarked, no?). He has jetting recommendations for various stages of basic modification.

Still, keep in mind that no-one can TELL you how to jet. You have to do the work. There are way too many differences in conditions and riders that have to be taken into account.

Setting the AS to hi-idle is a starting point, but likely not where it will stay. You'll have a lean-bog when you snap the throttle, likely. The AS is set to the spot the throttle response is the best (example: In 2nd gear, slow walking speed, under load..say uphill some..wick-it quick to 1/2 throttle and there should be no hesitation).

Re: has anyone leaned the needle?

Ha! We've changed needle clips, needle slopes, L1 lengths, we've put shims under the needle clip to get to someplace between the .90mm needle clips and used double tapers. We've bored carbs, put divider plates in the front and the back, modified idle circuitry, machined slides, modified jet nozzles and jet screens. We've bolted up 38mm carbs. We've swapped in airstrykers.

What about the main? You'll find kdxs from 145 to 300+! Yeah...they've been changed some. ;)

Seems 'we' have been busy, 'eh?

You're gonna have fun!!

As you've noticed, the KDX is a completely different bike than your [and my] KX - - and that's why it's so easy to ride in the tight stuff- soft 4-stroke like power delivery and soft suspension that sucks up all the rocks & roots instead of deflecting off of them. The more you make it like the KX -heavier springs, aftermkt pipe,etc, the more it will ride - and tire you - like the KX does. In the quest to get my KDX to "go fast" and handle at speed, I added stiffer springs, FMF pipe, bored carb, flycut the head etc, etc. Well, It ended up handling much better going fast but lost most of it's tight gnarly trail going slow ability. So, I'm backpedaling - looking for some happy medium. If you add the pipe [recommended] you'll gain "tons" of power. I'd recommend adding a flywheel weight to offset the greatly increased throttle response or you'll think you're back on the KX. If you're really heavy, try stiffer front springs - but again not too stiff. I'm using 1 of the stock [.35] springs in 1 fork and a .38 in the other leg with good results. Installing Race Tech Gold Valves is probably the "best" mod I've done - all of that harshness over small bumps has disappeared and I can ride it all day without beating up on my arms. Just FYI, by revalving & respringing a KX, you can make it as good in the slow, tight stuff as a KDX ! You can also move the powerband [Eric Gorr cylinder mod] way down low for tractor like pulling at idle ! Either way you go, it's only money