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Montana 911
Join Date: May 2002
Location: Montana
Posts: 5,818
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failed theft attempt...how do I fix it? Motocross experts?
Last week someone attempted to steal my Yamaha YZ, when they figured out it was secured beyond their ability they just left it laying on it's side. The issue is the front wheel was in a chock and the pressure caused one of the fork seals to blow out leaking the fork oil everywhere.
I have done DH Mtn Bike forks in the past, pretty sure the motocross fork is much the same as far as internals, etc. Motocross guys is there anything I should look out for? Tips? Thanks for any assistance in advance. 
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H.D. Smith 2009 997.2 S 3.8 PDK 2019 Ford Ranger Lariat FX4 Baby Raptor 2019 Can Am Renegade 1000R XC 2020 Yamaha YFZ450R |
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04-10-2009, 07:03 AM
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MAGA
Join Date: May 2004
Posts: 10,762
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Been a while since I did forks on my early 90's CR 250's, but if you are going to be changing the fork seals, you will need to unscrew the fork caps, then you will need to remove the forks, then remove the springs, then remove the seal retainers, then yank the inner tube from the outer tube. You might want to buy a manual, as some forks require special tools for total disassembly. You will need to find out what weight and quantity of oil needs to be put back in them also.
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne 0% Liberal Men do not quit playing because they get old.... They get old because they quit playing. |
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04-10-2009, 07:26 AM
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Registered
Join Date: May 2004
Location: Lake Cle Elum - Eastern WA.
Posts: 8,416
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Pretty much like Tim sez. Need "snap-ring" pliers to remove the snap ring above the seal. Some dampener rods are held in with an allen screw accessed from the bottom after the axle is removed. If the dampener rod just spins when you remove the bolt, try an air wrench while the lower fork leg is held in a vice and you attempt to pull the upper leg out. This will keep you from buying the special tool to hold the rod.
After that, you can pull the upper leg from the lower. If the seal does not pry out easily, heat the area with a propane torch. Use the old seal as a driver for the new seal.......I'm doing this today on my ST-1300....
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Bob S. 73.5 911T 1969 911T Coo' pay (one owner) 1960 Mercedes 190SL 1962 XKE Roadster (sold) - 13 motorcycles |
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04-10-2009, 07:56 AM
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Registered
Join Date: Feb 2009
Location: Nevada
Posts: 133
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First, what year is your YZ?
Is your compression on the top? or bottom of the fork? This will let you know if your dealing with duel chamber or the older single chamber forks. Next, you'll need a few specialty tools, but you can fab them up easily enough. IE piece of PVC pipe as a seal driver. If your interested the best site I know of for MX tech support is ThumperTalk, I'll post up a link for you, they have a YZ specific forum as well as a suspension specific forum. |
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04-10-2009, 08:21 AM
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Registered
Join Date: Feb 2009
Location: Nevada
Posts: 133
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Here's the link to the Yamaha specific forum, great source of info.
http://www.thumpertalk.com/forum/forumdisplay.php?f=12 |
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04-10-2009, 08:23 AM
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Montana 911
Join Date: May 2002
Location: Montana
Posts: 5,818
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thanks all for the responses.
The bike is a 2005 YZ 125, compressions settings on top of the fork. Ok it sounds much like the internals of my Marzocchi Shiver dual crown MTB fork. Open bath valve, etc. Again thanks a bunch, should be a simple enough project. 
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H.D. Smith 2009 997.2 S 3.8 PDK 2019 Ford Ranger Lariat FX4 Baby Raptor 2019 Can Am Renegade 1000R XC 2020 Yamaha YFZ450R |
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04-10-2009, 08:29 AM
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