2005 KX250 Off-road/ Hard enduro Build

Gibbs_293
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Gibbs_293
Edited Date/Time 8/31/2019 11:13am
I was looking at getting a Ktm 250/300XC to get into some hard enduro riding. While my kx450 is set up for woods it’s by no means a worthy hard enduro bike but I was hesitant dropping that much money. A few weeks ago this 05 Kx250 dropped into my lap. I decided to forgo the ktm and do a frame up build on the kx

I bought it for $1300 which I think was a good deal. The bike is pretty clean for its age. Starts first kick but was bogging pretty bad. The guy I got it from didn’t have the time to tear it apart. I got it home, power washed, drained the old gas out and gave the carb a quick blow out with carb clear. Fired it back up and it reved out perfectly. Score! I have yet to take the head off to inspect the top end but with the way it was running and the fact that I am going to replace everything I’m not to worried about it.

Not sure how big the off-road/enduro community is on here but what are some must haves for this type of bike? What are some good to haves? Going to start buying parts and wait until I have everything to start tearing the bike apart.







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ledger
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ledger 8/27/2019 9:09pm
8/27/2019 9:09pm
Bike looks great for its age, still has the stock pipe and original seat cover. There's no shortage of power...I suggest starting with a flywheel weight. Yup, nice score you got.
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Chance1216
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Chance1216 8/27/2019 9:37pm
8/27/2019 9:37pm
$1300 you basically stole it. I'd grab a skid plate.
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soggy
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soggy 8/28/2019 6:16am
8/28/2019 6:16am
probably going to need some engine work to make it have a more friendly power delivery then stock.
Kennyfreemoney 8/30/2019 8:46am
8/30/2019 8:46am
Skid plate, FWW, 18" rear wheel, FMF Gnarly Pipe

The Shop

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Gibbs_293
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Gibbs_293 8/30/2019 8:59am
8/30/2019 8:59am
soggy wrote:
probably going to need some engine work to make it have a more friendly power delivery then stock.
I plan on doing a fly wheel weight and rekluse. I have a rekluse on my other bike but have never used a fly wheel weight. Hopefully that tames it down a bit.

I took the bike out yesterday for a little bit and the power is insane. It is a blast in the open trails but not well suited for technical tight single track. I am thinking about getting a magura hydraulic clutch as well. The clutch pull on this is tiring after a while. Even after lubing it up real good. I am going to see if the rekluse solves before I get the hydraulic but even with a rekluse I still need to use the clutch for obstacles.

This is going to get expensive haha.
Matt Fisher 8/30/2019 10:40am
8/30/2019 10:40am
I remember the last gen KX250's sometimes needed the air gap between the flywheel and pickup to be set properly. Don't recall the specifics, but a search should get you going.
Gibbs_293
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Gibbs_293 8/30/2019 10:46am
8/30/2019 10:46am
Matt Fisher wrote:
I remember the last gen KX250's sometimes needed the air gap between the flywheel and pickup to be set properly. Don't recall the specifics, but a...
I remember the last gen KX250's sometimes needed the air gap between the flywheel and pickup to be set properly. Don't recall the specifics, but a search should get you going.
Thanks for the heads up. Ill look into that.
Markopolo400
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Markopolo400 8/30/2019 11:03am
8/30/2019 11:03am
Matt Fisher wrote:
I remember the last gen KX250's sometimes needed the air gap between the flywheel and pickup to be set properly. Don't recall the specifics, but a...
I remember the last gen KX250's sometimes needed the air gap between the flywheel and pickup to be set properly. Don't recall the specifics, but a search should get you going.
Yep! Set it on the high end of the spec called out in the manual.
rjg
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rjg 8/31/2019 7:45am
8/31/2019 7:45am Edited Date/Time 8/31/2019 7:46am
Rekluse will make clutch pull more difficult, but it's saving grace is that you will use significantly less
Edit: ops you already knew that since you already have one.
Gibbs_293
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Gibbs_293 8/31/2019 8:40am
8/31/2019 8:40am
rjg wrote:
Rekluse will make clutch pull more difficult, but it's saving grace is that you will use significantly less Edit: ops you already knew that since you...
Rekluse will make clutch pull more difficult, but it's saving grace is that you will use significantly less
Edit: ops you already knew that since you already have one.
Actually I have had a different experience with my Rekluse. The clutch pull was unchanged on my 450. I did get the top of the line CX model with the new friction plates to eliminate this very issue. I plan on doing the same with the 250 but they only make the Radius X for the 2005 not the CX. They both have the same friction plates so I'm hoping I will get the same results.

Does anyone have experience with the Radius X?
soggy
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soggy 8/31/2019 10:43am
8/31/2019 10:43am
a fmf gnarly and the power valve mod would help move the power into a lower rpm ranges as well.
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bugnboo
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bugnboo 8/31/2019 11:13am
8/31/2019 11:13am
Thumpertalk Kawasaki 2 stroke section has a lot of info
smv ryder
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smv ryder 9/1/2019 9:05am
9/1/2019 9:05am
I built an ‘01 KX250 for Colorado single track/off-road.
Gnarly pipe for sure but I really liked the PC platinum.
FWW for sure.
I could never got my lectron carb to work great for me but others have on the KX.
One of the better mods is the KDX 250 transmission, it’s a wide ratio transmission and really helps off road.
There is a very very talented rider from Canada that goes by the forum name small_and_fast, he races a 2005 KX250 in pro class for hard enduro. I would find him on IG or thumpertalk. His IG is malcolm_hett

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