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My Kdx-Kx Hybrid

Posted: 04:44 pm Nov 15 2011
by doctord23
Here is my hdybrid story:
I bought a 2004 Kdx 220 motor a year ago that had the piston grenaded. I had to replace one side of the crankcase and replace the crank bearings. I sent the cylinder to Langcourt and the head to Ron for his magic touch. I then found a super clean 2002 KX125 and traded a CRF150 for it. I'm in Cally so '02 is the best year to use. I pretty much followed the cookbook for hybrids and did all of the work myself.

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A few of the things I found along the way that might help others:
1. The new Bill's pipe I bought had too short of headpipe to work. I was able to make some slight bends to an FMF desert pipe to make it clear the frame, radiator and meet up with the silencer. I used some fat bars for my bending leverage tool. I swapped the pipe mounting brackets top & bottom and made an extension bracket for the top mount.
2. I bought a Turbinecore SST silencer for a KX250 and made a couple of brackets and a bend to the inlet pipe to move it forward enough and meet the chamber pipe.
3. I did not cut off the existing motor mounts. I removed the inside half of the lower mount on each side and elongated the mount bolt hole with a dremel to line up with the engine bolt hole. I then made a plate to reinforce it and riveted it in place on the outside of the existing mount. Similarly I made a plate for the top mount and bolted and riveted it to the existing mount.
4. I used a petcock from an '87 KDX. It has a reserve and the outlet pivots.
5. I used the front fender, number plate and triple clamps from a 2004 KX250f for a newer look. I used the '02 stem with the clamps.
6. Rear wheel is the 18" KDX wheel using the KX spacers.
7. Kick lever is also from the '87 KDX, although I may go with a KX250 kicker later.
8. I am running the KX125's TMX 38 carb. I had to lean it out a lot on the pilot jet, but I am very happy with how it runs.
9. I'm using the KX's air box with no mods.
10. I'm using the KX's coil with the KDX wiring and CDI. I removed the voltage regulator since I don't have lighting. CDI is mounted in the airbox.
11. I re-used the KX's water hoses.
12. New kickstand is bolted to the swingarm.
13. I used a GPR steering stabilizer from my KX500. I had to ream out the frame mount to fit the KX steering head.

It is a blast to ride. I still need to soften the front forks a little, but that will happen soon.

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hybrid

Posted: 06:36 pm Nov 15 2011
by canamfan
That's nice a very good job. i'm thinking of doing the fork conversion on mine. Enjoy your ride.

Posted: 07:15 pm Nov 15 2011
by frankenschwinn
Nice. Love my 02. Seems the easiest model to do.

Posted: 08:05 pm Nov 15 2011
by scheckaet
The air box mod was a bitch though.

Posted: 06:56 pm Nov 16 2011
by THill
GOOD LOOKING RIDE !!

You should be able to use your KDX rear wheel on that bike.
I ran a KX on my KDX for awhile....have you a 19 and 18 rear wheel, the axle is the same size...

FYI.....I have a 02 swingarm on my new 03 frame #2 Hybrid build using a KDX rear wheel , hope to have some pic's up soon....

Posted: 09:04 pm Nov 16 2011
by MadMax
Ok good looking bike but..... Why would you swingarm mount a kickstand if you don't have to? I find the kickstand on my bike one of the most dumbass things I've seen on a motorcycle ever. I'm looking at doing the trailtech kickstand ASAP. Just my opinion.

Posted: 10:14 pm Nov 16 2011
by rbates9
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MadMax wrote:Ok good looking bike but..... Why would you swingarm mount a kickstand if you don't have to? I find the kickstand on my bike one of the most dumbass things I've seen on a motorcycle ever. I'm looking at doing the trailtech kickstand ASAP. Just my opinion.
There is a lot of talk about this. All I know is the stock stand on my KDX seems to work much better than the frame mounted stands on the bikes of the people I ride with. Well at least until they find the right size rock or stick to put under it to get the bike to stay up on anything but pavement. :wink:

Posted: 10:33 pm Nov 16 2011
by doctord23
Unfortunately Trailtech doesn't make a stand for a 98 to 02 KX so my options were limited. I don't like the look of the clamp-on stands. I've had bikes without stands but definitely prefer to have one.

Posted: 10:51 pm Nov 16 2011
by scheckaet
Trailtech can b modified like i did.

Posted: 11:15 pm Nov 16 2011
by SS109
>|<>QBB<
rbates9 wrote:>|<>QBB<
MadMax wrote:Ok good looking bike but..... Why would you swingarm mount a kickstand if you don't have to? I find the kickstand on my bike one of the most dumbass things I've seen on a motorcycle ever. I'm looking at doing the trailtech kickstand ASAP. Just my opinion.
There is a lot of talk about this. All I know is the stock stand on my KDX seems to work much better than the frame mounted stands on the bikes of the people I ride with. Well at least until they find the right size rock or stick to put under it to get the bike to stay up on anything but pavement. :wink:
Same here. My KDX's stand always seem to work just fine while everyone else scrambles to find a rock or a tree!

Posted: 01:14 am Nov 17 2011
by MadMax
Well... http://kdxrider.net/forums/viewtopic.php?t=6152 seems to be an option I'd consider.

Posted: 01:51 am Nov 17 2011
by scheckaet
dats de 1.

Posted: 08:23 am Nov 17 2011
by THill
Didn't read it threw good , I see you got the KDX wheel on it..my bad !!

Posted: 11:38 pm Nov 21 2011
by eepime
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MadMax wrote:Well... http://kdxrider.net/forums/viewtopic.php?t=6152 seems to be an option I'd consider.
I did something similar but I drilled a new hole to match the one on the left ground it out with a dremel and cut off the extra metal. It still is a little too tall so I may have to remove off of the bottom of the stand next spring. I have to set it in a low spot when I stop or a small breeze will blow it over /IMG_2656.jpgImage
Here is how it looks on the completed hybridImage
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My Kdx-Kx Hybrid

Posted: 09:23 am Jul 08 2012
by kashola
Nice work! Was just wondering how using the 38mm carb compares with an RB modded 36?

Re: My Kdx-Kx Hybrid

Posted: 07:21 pm Jul 08 2012
by doctord23
I tried the KX carb and it was a low end beast but suffered on the top. It really didn't have the mid rpm hit that I was used to.
This seems backwards as you would think the larger carb would be all on top and low end would suffer.
After a couple of rides, I switched it with a 36mm RB carb and I am happy with this combo.

Posted: 06:31 am Jul 10 2012
by factoryX
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God, what a great looking bike.

My Kdx-Kx Hybrid

Posted: 10:24 pm Jul 10 2012
by doctord23
Here is where I ended up with a kickstand on my hybrid:
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They don't make a kick-it for the 99-02 KX, so I used one for an 03-05 YZ450f.
The top bolt is the subframe lower bolt.
I made a bracket to mount the lower bolt to the lower chain roller bolt by cutting an aluminum handguard clamp in half.
It sits a little low, but I only rubbed it once this weekend on some very rocky trails with many log crossings.
It folds behind the side number plate just like it does on the YZ and the height is perfect.