KX Riders
Maintenance & Technical => KX500 Steel Frame Conversion (SFC) => Topic started by: chilihoop on September 20, 2014, 06:27:25 PM
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Trying my hand at a 2008 KTM sxf 450 to KX 500 conversion and I have a question about what air box I should be using. The four stroke ktm boot is much higher than the kx 500 carb. Any suggestions would be greatly appreciated.
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Thought I read a 2000 CR250 boot was used on one. What about the KTM 250sx boot?If that was close, that would be my choice
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Chilihoop,
I did an 2006 Ktm/Kx500 conversion. On my conversion I used the stock 450/525 airbox, and bought a Ktm 250sx airboot. The airboot mated up perfectly to the KX-500 engine. --Kracer
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Thanks for that Kracer. Did you have to put a 6mm spacer on the right side of the swingarm pivot to align the countershaft and swingarm, read that somewhere. What about the engine mounting brackets---when I installed the spacer on the swingarm bolt it moves the whole motor to the left, which puts it slightly off centre. Any information would be greatly appreciated.
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Chilihoop, The way I did it, (and there might be a much better way). Was yes, I put in the motor (with a brand new countershaft sprocket on), put in the swingarm, with the rear tire, a brand new rear sprocket mounted, of course measured from the swingarm pivot, to the rear axle centerlines on both sides, with the rear axle as far to the rear as I could get it. I used a straight edge, and a fine piece of thread, that I could see really well, and made sure that the center line of both sprockets lined up perfectly. I was VERY meticulous about this. I made the left side spacer first, (the side with the countershaft). I did a lot of hand filing on both spacers, to get this exact. To be honest, I don't remember the measurements of the spacers. To me, this is procedure is something that I always do, I had a couple of Service Honda's made for me a few years ago, and you wouldn't believe how far off their spacers were. (The chain kept de-railing on one of them, and I had to totally re-work the bike!) That's when I decided to build my own conversion. If you want Chilihoop, I can get the measurements for you, but you should really handfit those spacers, and be meticulous. Nothing worse than having your bike tapped-out, bottoming your suspension, and having your chain de-rail. Especially if you are an old fat guy, like me--Kracer
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Hey just wondering where you guys are getting your pipes for the conversion....
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Hey just wondering where you guys are getting your pipes for the conversion....
I think a lot of guys are using the ktm 300 2 stroke pipe
And some are having custom pipes made
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I would not expect the KTM 300 exhaust to be big enough to let the K5 breathe right unless you are only doing lower rpm trail stuff. I will be doing a CPI on mine based on what I have seen on IDKX500's Christini project.
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Trying my hand at a 2008 KTM sxf 450 to KX 500 conversion and I have a question about what air box I should be using. The four stroke ktm boot is much higher than the kx 500 carb. Any suggestions would be greatly appreciated.
I used the boot for a the 300, it fits on the air box you have.