Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

2009 KX540

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supertuner:
So I bought a 2009 KX250F in a box for cheap and put it together , was ok but unimpressive and just kinda uninteresting so I started looking at options for improving the performance and some how during the wee hours of the morning awhile back I found this site and was immediately drawn into the 500 2-stroke idea. So here I am weeks later still lurking around and trying to gather as much info as I can, then BAM. I just jumped in {probably head first} to a KX540 build. 250f motor listed on Ebay. So here it begins. Bear with me as I'm still figuring things out on this site. {like pictures} http://imgur.com/a/W65HS

sandblaster:
Hey supertuner.
Welcome to the site.
I edited your post to show the picture.
Go to your first post and edit it.
Then look at the code for how I inserted your picture.
Keep the pics coming.

supertuner:
After 120,000 posts read between this site, KXGURU, Thumpertalk, MacDizzys two stroke, supermoto ect. I'm currently re-building motor and getting a list going, may not be a 540 as I was told, crank appears stock with 88mm bore that is scored but ran with good compression. So first I will be replacing all lower end bearings, c-clips and using OE crank seals. Cases lapped, de-burred and cleaned but not sandblasted, new rod and piston will be a Wossner, very mild porting mostly just clean up intake and smoothing sharp edges entering transfer ports, {no raised ports} before re-plating at 88mm,kips bolt mod, Vforce-2 reeds with 10mm spacer,head de-comp,  and most likely a flywheel weight as most of my riding is woods/mx.
I will be using service Honda fmx gnarly pipe.

So, I have a some questions...
1. Was the ported piston actually found to be effective? {port size and position that is best?}
2. Are C2 or C3 bearings preferred? {keep in mind I live in Minnesota and have never been to the desert}
3. Recommendations for crank assembly and balance?
4. Fill decompression reliefs in transfer ports or leave them before cylinder is plated? Head will have de-comp valve and possibly re-chambered but must be able to use 91 octane fuel.

supertuner:
Just a little update, new wossner rod installed and balanced with 88mm wossner piston, all new oem bearings and c-clips are here, cylinder off to get replated, new service honda pipe came in but still no silencer..

reklessj:

--- Quote from: supertuner on November 13, 2016, 10:54:40 AM ---Just a little update, new wossner rod installed and balanced with 88mm wossner piston, all new oem bearings and c-clips are here, cylinder off to get replated, new service honda pipe came in but still no silencer..

--- End quote ---
Awesome you should be up n runnin in no time

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