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cwtoyota
8/12/2021 2:45pm
8/12/2021 2:45pm
Edited Date/Time
8/14/2021 3:37pm
What is the hot setup for these old bikes?
Most important, what's the sag and fork height setting that makes a good starting point?
I've read old threads, magazines, etc saying that aftermarket linkage dog-bones are a big improvement in cornering. I'm seeing the 132.5mm length everywhere I look, so I plan to try a set of those.
I am building a 1990 model with a set of modern forks.
I'd love to hear your experience if you've owned and raced one of these old green machines.
Most important, what's the sag and fork height setting that makes a good starting point?
I've read old threads, magazines, etc saying that aftermarket linkage dog-bones are a big improvement in cornering. I'm seeing the 132.5mm length everywhere I look, so I plan to try a set of those.
I am building a 1990 model with a set of modern forks.
I'd love to hear your experience if you've owned and raced one of these old green machines.
2014 YZ250F KYB forks.
Emig Racing lower triple clamp with custom Luxon Engineering upper triple clamp.
Emig Racing dog bones.
Frame and subframe gussets added throughout, plus mounts to accept KX450 foot pegs.
2 piece clutch cover mod.
Moto Stuff 280mm front rotor.
Guts Racing +1" firm seat foam.
The list goes on and on...
I ride a lot of sand, prefer the 06-08 KX450 clamp with more offset. I don't go less than +5mm fork height and 120mm on sag.
Enjoy and don't forget to short shift!
OEM for the 500 was 25mm plus a 30mm fork lug offset.
The 48mm KYB Yamaha forks are 32mm offset, so a 23mm clamp would bring you to stock KX500 spec.
I machined my own 7075 clamps for some Yamaha forks with a 22mm offset. That gives me 54mm offset, one millimeter less than stock. Initially I'll be running the same valving as my YZ250 and a 0.49kg/mm spring rate.
I'm planning to make a set of dog-bones to try next week in the 132.5mm length (same as the Emig parts)
Adam43, is the 06-08 a 23mm offset? I believe all those KX-F forks were a 33mm lug offset.
If I'm correct, that gives you 56mm total which is +1mm from the stock KX500 spec. I'll write down 120mm as a starting point for sand.
nytsmaC, Solid advice on the brakes, that OEM Kawi front brake was junk. I will be running a 270mm Galfer rotor on a YZ wheel with a Honda CRF-450R front brake assembly.
The Shop
I have the bottom end done and I'm working on the top-end tonight.
With any luck I'll get this thing out to a local track called Ward Creek on the 22nd for a little test-n-tune.
A buddy suggested 13:50 or 13:49 gearing.
What are you fellas running for medium terrain tracks and for hard-pack?
The stock gearing was 14:47 for that year, I think maybe he got confused on the front sprocket size.
Can't remember the triple clamp offset, but it was what Emig Racing recommended.
Here’s my old girl.
Eventually I'd like to build a shock with a high speed adjuster. The compression adjuster in these old KYB shocks changes both low and high speed compression at the same time.
Looks like the start of a nice build cwtoyota
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