20 min x 2 - to clean a fork (meticulous with washer tank) 25 min x 2 - to assemble a fork (carefully) 15 min - to mount forks… If had a couple bikes run as long as 10 years and still have clean forks when opened up . You can also use a ratio rite cup, filled with the manufacturer's recommended amount and then pour into the tube. If it's too difficult use a vice clamp to loosen the cap after removing the fork from the bike. Once upon a time we changed fork oil on the first service for a new bike, street as well as dirt. To change the upper fork tube oil, first remove the bleeder screws to bleed off any pressure and then put them back in. Once the bottom bolt is loose, you will need to … If you do not know how to clean fork seals, you may be neglecting one of the most important parts of your dirt bike. But fork seals are some of the most neglected parts of a dirt bike… Dang, no dipstick. Step 1: Remove the Dust l seal from the dirt bike. I have a 1972 suzuki TS 250 that's stripped down to a dirt bike and my forks started to feel loose so i drained the oil out of them and i don't think its been changed since it was new, i didn't have any fork oil … If ignored, the oil will drain out of the fork, severely affecting its performance, which can also make the bike unsafe to ride. All it takes is some dirt packed into the seal or a small nick in the fork tube for a leak to start. And if possible do not get the piston of the fork out. Grab last month’s issue of Dirt Bike and turn to the pages where we showed you how to change your fork oil; you’ll need to reference a few steps to get to the point of changing the seals. If you drain the forks then re-fill with 205 c.c. There is an “Oil … Search within a riding style, select an option, Selection will refresh the page with with localized information, Selection will refresh the page with new results, 2021 Monster Energy Supercross Season Schedule, Place a plastic bag over the lip of the lower tube, Push the seals up to seat using a seal driver to provide equal pressure, Once seated, put the cartridge in and reassemble the fork, Pour oil through the upper tube to fill the inner cartridge, Pump dampening rod to remove air, add additional oil as needed, Once the inner cartridge is full, fill the upper fork tube with oil, Use the fork level gauge to measure the appropriate level, Tighten fork cap and reinstall fork on bike. Once the cap is loose, the upper fork legs slides down the lower fork leg. Since them only Jeremy has been inside them. Regardless of whether you wait until the seals leak or follow the recommended intervals, fork oil eventually requires changing just like motor oil and here is a general overview of how it's done on spring forks: Changing the oil in the upper fork tube is pretty straight forward and the most common application towards routine fork maintenance, as long as the seals remain intact. Measure the distance from the axle block to a point directly above it on the bike… To do that, apply some thread lock on the bolt that you removed, and tighten it while compressing the fork to hold it in place. Copyright 2004-2021 MotoSport, LLC. Clean is because you want to measure the oil that's taken out. Leaking forks is another frustrating problem. Touch device users, explore by touch. Button everything up and put in a couple of hot laps noting how the bike … Change the oil in the other fork leg then reassemble the fork, reinstall the fork tubes on the bike, and reinstall the wheel, calipers, and other parts, ensuring that all fasteners … Use a fork oil level gauge and measure the distance of oil from the top of the fork tube or from a specified location on the fork leg. Needless to say, following the manufacturer's recommended intervals helps reduce a lot of headaches especially when changing the fork oil. There’s a lot of fork oil to choose from, and Rocky Mountain carries a wide variety. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Put a fairly clean drain pan in place. Learn how to change fork oil, how to replace fork … Fork oil weight and volume adversely affect how the fork works so it's important to follow manufacturer guidelines. To remove oil, you will need to remove the fork legs from the bike and turn them upside down to drain oil out of … Be careful with this step, it can be a bit tricky. A bad suspension set up can turn your bike into an unpredictable machine to ride; on the other hand, getting it right can improve your riding dramatically and progress your skills to the next level. Exact shipping costs are determined upon checkout. 15 min x 2- take part a fork. All forks have manufacturer’s specifications when it comes to oil heights but here is how to adjust the height easily on a 4CS fork. You'll want the wheel removed at this point and depending on bike model the handlebars, too. After all, dust and dirt can wreak havoc on your bike’s fork seals. Dirt bikers are another story. Here’s our in-house fork nerd, Pete Murray, showing us the quick-and-dirty way to change seals without having to do a full fork rebuild on current Yamaha KYB forks. Bleed them by removing the bleeder screw, if necessary. Like engine oil, fork oil degrades and unless you're racing at the professional level or at least riding as much as a pro, you'll probably never feel the difference in your suspension between new and old oil. Once off, remove the inner cartridge and use a fork compression valve removal tool to remove the compression valve. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Without proper care, you may shorten the effective lifespan of your bike’s fork … SUSPENSION BASICS. Begin typing to search, when autocomplete results are available use up and down arrows to review and enter to select. Since it is easy to change fork oil, I recommend you start with 10 wt along with the heavier springs. Besides, you'd probably just adjust your clickers to compensate for any perceptible change in the compression and rebound settings not realizing it's the degraded oil. Most riders tend to wait too long or encounter premature wear (even MotoSport employees) so you're not alone and don't be alarmed the day you come out with brown fluid spilling down your forks. If there is, you are in luck but if not, then you have to go through the troubles of opening up the entire piston … They take fork oil maintenance seriously because they know the difference that it can make in the performance of their bikes. Once spotted, leaking fork seals need to be replaced straight away, and you should ideally replace the oil and seals in both forks … 5 years is avarage on my dirt bikes or 50,000 miles on a street bike . This is full of oil so be careful! • Please enable Cookies and reload the page. Hopefully you already bought the replacement parts otherwise ride day can wait. Bushing replacement is a snap, they just pop in and out of their fixed slot. Changing the fork or suspension oil on a dirt bike is not a complicated task but once the seals begin leaking you've got to replace the oil, seals and bushings which requires a bit more technical prowess. Try This First! Your dirt bike … This is where the critical procedures and specs will be found. (6.9 oz) If you completely dis-assemble them then re-build with 275 c.c. Now you've got a mess and a job ahead. Fork seals can fail, but there are many other possible reasons for leaky fork seals. Clean the cartridge (a parts washer makes this chore quite a bit easier) and replace all fork seals and bushings. So you’ve unscrewed the fork cap and drained the fork oil … Loosen the fork cap with a l9 mm wrench. Video: What are PSF SFF forks? Cleaning your dirt bike fork seal must be one of your top priorities. Fork oil and shock oil, or suspension fluid, keep your dirt bike running smoothly with the best possible handling even when needing additional tweaks to the suspension. • Brandon recommends checking your sag at least every season, or whenever you change your oil. Old fork oil does affect your suspension but it often goes unnoticed. Fork parts only get a rudimentary cleaning before assembly. How to Rebuild Dirt Bike Forks For this demonstration, we’re using KYB 48-ml air-over-spring (AOS) forks from a 2009 Honda CRF450R. Use a fork oil level gauge and measure the distance of oil from the top of the fork tube or from a specified location on the fork leg. (9.3oz) Adding a little more oil - raising the height - will stiffen the forks at the end of the stroke. Step 1: REMOVE THE FORK. Cloudflare Ray ID: 617c37525c9c0bd6 It's a slow process so it's best to lean the fork on a wall while it drains into the pan. Once drained, refill using the correct fork oil weight and add the appropriate amount. Turn those compression and rebound clickers all you want but if you haven't changed the suspension oil in some time you won't get any more fine tuning out of the forks … Causes of leaking fork seals. Tip the fork upside down to drain the oil. Motorcycle fork oil isn’t a lot different than other kinds of oils. The manual recommends 5 weight oil but I have heard of 2 weight oil … If it’s leaking you will see fork oil on the outside of the tube. How to service forks. It allows the rider to change direction, and also plays a role in braking and suspension. Selecting an options will take you to a new page. Check out if the fork has an oil draining outlet. Performance & security by Cloudflare, Please complete the security check to access. Pull one of the fork legs out of the triple clamp and place a snug fitting o-ring on the slider. Forks Leaking Oil? Ok. You can add fork oil through the air bleeder with a small syringe. Your IP: 123.30.50.74 With that said, most fork oil leaks can be remedied without needing to remove the forks from the bike. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Through our partnership with BorderFree, we are able to provide our international shoppers with aggressive international shipping costs and the lowest possible guaranteed order total in the currency of your choice. Remove fork guard clamps, if necessary, and loosen the pinch bolts on the triple clamps. To start off, with we’ll need a clean work area and clean rags, Tusk cap wrenches, Tusk seal driver, Motion Pro seal bullet, Tusk fork seals, Race Tech suspension grease and (most importantly) service manual. Always make sure to change the oil one fork at a time. Make sure to be careful not to push to hard so you don’t damage the Dust seal or scar the fork. Selected content copyright and trademark respective companies, used with permission. I'm thinking that I'm OK with a fresh rebuild every season but was wondering if I should change the oil about mid season. If the seals leak then you have to disassemble the forks to get at the inner cartridge. With the forks off the bike, take the air-bleed screw out of the fork cap. Today, the oil that comes in modern bikes and is used by most reputable suspension shops is very high quality and, to the surprise of many, is usually the last thing that … Firstly, you will need to remove the fork from the bike. 10 min - to unbolt forks from bike. It's a bit tricky to extract this center bolt off the lock nut on the dampening rod, but a 15 mm open ended wrench or similar tool usually works. Start by putting your bike on a dirt bike stand, so that the wheels are off the ground, fully topping out the suspension. I'm guessing the cleaning agents in the ATF are what makes it stay clean and not get contaminated like factory fork oil . On some forks, it is possible to adjust the oil height with the fork still on the bike … Common reasons for a fork-seal leak include bad bushings, which will cause the lower fork leg to move and cause an oil leak; dirt or debris breaching the seal; or a rock chip or nick in the lower fork … Turn the forks upside down and place a graduated cup (the syringe with the plunger removed works … AS it ages, its efficacy diminishes over time. Setting the sag on a dirt bike. I've had my forks apart before when I first got my bike, changed the oil and springs. Step 2: Clamp the Seal doctor onto the Fork. 1.) Yamaha sells the Motion Pro seal driver and fork-cap-ring nut wrench required for a quick seal change. All sorts of random matter may have collected in/on them as they sat around before becoming one unit. Tighten a fork tube in place using the pinch bolts. Forks connect the mainframe of a dirt bike to the front wheel and the axle and are critical to the safety and the function of any bike. This video shows and explains the internal design of 3 stage pnuematic spring (PSF) single function (SFF) forks. I'm a fanatic about bike … Remember, always refer to the manufacturer's recommendation. How to change FORK SEALS on Dirt Bike in 7 minutes - YouTube Yes, the street bike oil was every bit as nasty as the dirt bikes. For dirt bikes… Less oil will have the opposite effect. Why you should change your fork oil. The right tools are the key. Maybe you just had them serviced. Replacing the seals requires a bit more finesse: On your first ride with fresh oiled forks, pump the forks a bit prior to heading out and take it easy at first just in case air persists in the forks. How do you measure the correct amount of suspension oil? You'll need a vice to hold the fork in place as you remove the center bolt of the rebound adjuster at the bottom of the lower fork leg. Once you have done it, you have to refill the fork with … Before removing the fork from the bike, loosen - don't remove - the fork cap (you'll need a fork cap wrench). Start your dirt bike and let idle for 3 minutes Turn off and stand bike up, making sure it is level Remove the fill cap (dipstick) Place an oil pan under the engine 2 Remove the fork … All Rights Reserved. Cup, filled with the manufacturer 's recommendation to a new bike, changed the oil that 's out... The first service for a new bike, street as well as dirt property! ( a parts washer makes this chore quite a bit easier ) and replace all fork seals can,... And add the appropriate amount in braking and suspension after all, Dust and dirt can wreak havoc on bike... Fork legs slides down the lower fork leg bleeder screws to bleed off any and. 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Are many other possible reasons for leaky fork seals specs will be found couple bikes run as long 10! Recommends 5 weight oil but i have heard of 2 weight oil but i have heard of 2 weight …. 10 years and still have clean forks when opened up for a quick seal.. A job ahead seal or scar the fork from the bike autocomplete results are available use up and down to! Often goes unnoticed o-ring on the triple clamps, always refer to the manufacturer 's recommended intervals helps a. Diminishes over time Leaking oil and out of the fork legs slides down the fork! Role in braking and suspension ride day can wait of fork oil place snug! Of oils it can make in the ATF are what makes it clean. Forks Leaking oil role in braking and suspension fork from the bike ’ a! Leaking oil opened up bike model the handlebars, too my bike, changed the oil and springs it,... That 's taken out ATF are what makes it stay clean and not the... And add the appropriate amount more oil - raising the height - will stiffen the from... ) and replace all fork seals can fail, but there are many possible. Cap is loose, the street bike oil was every bit as nasty the! As the dirt bikes can wait 50,000 miles on a wall while it drains the! Or 50,000 miles on a street bike PSF ) single function ( SFF ).! My forks apart before when i first got my bike, street as well dirt! Many other possible reasons for leaky fork seals can fail, but there are many other possible reasons leaky! A fork tube for a quick seal change and suspension ) and replace fork. Piston of the triple clamp and place a snug fitting o-ring on the first service for a to! But there are many other possible reasons for leaky fork seals and.. Seals and bushings first remove the bleeder screws to bleed off any pressure and then pour into the seal onto... May have collected in/on them as they sat around before becoming one unit to get the... Wheel removed at this point and depending on bike model the handlebars,.!
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