OzVMX Forum
Marque Remarks => Yamaha => Topic started by: YZ250H on August 29, 2007, 02:38:00 pm
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Guys,
I seem to recall DJ suggesting a spring change from the 125J to the 250J to account for my beer gut. Does that mean the 250J and 125J shocks are interchangeable?? I know it's a long bow to draw, but I might be able to get hold of a 250 shock and the 125 is buggered - I think all the oil has leaked out >:(. Would anyone happen to know??
Any advice gladly received.
TIA ;)
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I believe so.
I've got (what I think is) a 125J shock which I'm hoping to put into my 250J.
Will check them out properly if nobody comes back with a proper answer.
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YES! YES! YES! YES! THEY DO interchange they share almost every part except springs and damper sub assembly (250 and 490 are the same) When you compare the length of the damper sub assembly between your 125 and 250 shocks if there is not too much between them go for it I say
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The harder spring for the YZ125J is the 5X5-22212-10 which is the softer spring for the YZ250J, but the standard spring for the YZ250J after 30yrs of abuse should be spot on.
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The J shock will also work on the G but the valving needs a bit of attention or if you can get a softer spring that could work.
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Thanks guys - you've done it again. 8) The guy is going to measure his (shock) and I'll measure mine on the week-end and compare notes. As you say cyclegod if the lengths are anywher near the same I will go for it.
Nathan, I'm obviously going the other way - 250 into 125. I could probably do with the harder spring as this beer gut aint gettin' any smaller !! :D
I assume if you can use the 125J in the G you can use it in the H as well. Solves me another problem ;)
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The J shock will fit in the H yes but check the ride hieght and steering rake. The H swingarm is 20mm longer and the steering rake is the same as the J = 27.5- and I think from memory the J shock is about 8mm longer than the G/H shock so it does have a tendancy to sharpen up the steering, which is good in the G coz its rake is 30. That why I say it would be good to get a softer spring, and the initial compression would be a bit softer too.
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No worries - so this is how I see things panning out. Put the 250J shock in the 125J and the 125J shock (once rebuilt) in the 125H. The spring on the 125J seems very soft and may well solve the problem you speak of. What do you think - a plan or what ??
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Sounds like a great plan but keep hold of the 125H spring just in case the 125J spring is to hard. It might feel soft in the J because of the linkage set up but in the H it could feel alot different. I have a 125J shock in my 125G and it feel fairly stiff, so its just a bit of trial an error.
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One small snag - I don't have the H shock but hopefully that won't ne a big problem. I will see how I go with the J spring. Thanks for the constant good advice - much appreciated.
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Just be careful when retro fitting a J shock to a mono cross system, not only is the shock longer (higher rear end) but the compresion dampening knob sits above the top shock mount and can cause a problem when trying to refit the tank. >:(
Been there, done that.
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Evo550 what bike were you fitting the J shock too? and what happened with the tank, and yeah, on the G/H models the steering rake will became steeper.
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Hope this works
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its a monster ;D
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Thats abit more than squeezing a J shock under that their tank Evo550 ;D not alotta room left.
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Awesome Bike Evo 8) - as DJ says there is bugger all room for anything in there :o. I bet that's a fun bike to ride.
Back on the topic - I have purchased said 250J shock. Should go nicely into the 125J. I didn't quite get Evo's point about the dampening knob fouling the tank if you fit the 125J to the 125H. I was thinking I could possible have the spring shortened and reset (or would that be too much trouble?). Would 8mm in length make that much difference to the rear height (and therefore steering geometry) ?? Was the 125H stable enouigh to be able to handle a change in teh steering angle ? Will this make it giggle headed ??
Thanks for your help and comments guys - one of the most interesting therads I've been involved in.
Cheers ;)
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Just in case you might be interested theres a guy here in Perth with 3 non running YZ125J's, he wants $1250 for the lot
his number is 0407-388-403
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YZ250H, the 250J shock should fit striaght into the 125J and the 125J shock will go into the 125H but you will have to give the top mounting point on the frame of the H a little tweak because the bush of the shock is about 1/2mm wider. The ride height and steering of the 125H should be ok. Maybe look at the spring preload lenght if you dont like how she rides/steers.
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yz125 /250/490 shocks fit yz250/465g/h i have one in my 465 you have to tweak the top mount to make it slide in the shocks from memory are about 13mm longer but they have less shaft travel so you actually loose a bit of travel but the up side is you have compreesion adjustment so even though you have less travel it is better quality i found the best spring for me was the standard yz465h spring with preload set at100mm the differance between this shock and standard shock is like night and day ;) also the comp adj does not hit tank 8)
it ran last time i started it :)
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Thanks guys. The 250J shock goes in 125J, 125J shock goes in 125H after being rebuilt - from what holeshot says I'll get the added bonus of compression damping adjustment 8). Now all I need for the 125H is a swingarm and some wheels and a tank and a seat and a ............ ;D ;D. I'll have to head over to the monoshock rebuild thread to see what they are up to.
You guys are a wealth of knowledge and have already saved me at least a few hundred bucks worth of swearing and cursing ;D ;D
Cheers ;)
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I got the j shock in my 465 and had to use 8 mm ally spacers under the front tank mounts where they bolt onto the tank. This raised the tank slightly and cleared the comp dampening knob/housing, but comp damping is still too high even with the setting right out. need to get new shock or have this one operated on. I have heard of people modifying the fox coil over shock used for off road trucks. It seems to have the same dimensions and has 8inch long remote reservoir too.