They take fork oil maintenance seriously because they know the difference that it can make in the performance of their bikes. This is full of oil so be careful! All it takes is some dirt packed into the seal or a small nick in the fork tube for a leak to start. After all, dust and dirt can wreak havoc on your bike’s fork seals. This is where the critical procedures and specs will be found. So you’ve unscrewed the fork cap and drained the fork oil … 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. 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. Less oil will have the opposite effect. Your dirt bike … Before removing the fork from the bike, loosen - don't remove - the fork cap (you'll need a fork cap wrench). Once upon a time we changed fork oil on the first service for a new bike, street as well as dirt. 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. 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. 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. Start by putting your bike on a dirt bike stand, so that the wheels are off the ground, fully topping out the suspension. Turn the forks upside down and place a graduated cup (the syringe with the plunger removed works … 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. For dirt bikes… If it’s leaking you will see fork oil on the outside of the tube. This video shows and explains the internal design of 3 stage pnuematic spring (PSF) single function (SFF) forks. Setting the sag on a dirt bike. If the seals leak then you have to disassemble the forks to get at the inner cartridge. Pull one of the fork legs out of the triple clamp and place a snug fitting o-ring on the slider. 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. 1.) (6.9 oz) If you completely dis-assemble them then re-build with 275 c.c. Step 1: Remove the Dust l seal from the dirt bike. Now you've got a mess and a job ahead. Leaking forks is another frustrating problem. Causes of leaking fork seals. 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 … Loosen the fork cap with a l9 mm wrench. Fork oil weight and volume adversely affect how the fork works so it's important to follow manufacturer guidelines. Be careful with this step, it can be a bit tricky. Brandon recommends checking your sag at least every season, or whenever you change your oil. 5 years is avarage on my dirt bikes or 50,000 miles on a street bike . Yamaha sells the Motion Pro seal driver and fork-cap-ring nut wrench required for a quick seal change. Once off, remove the inner cartridge and use a fork compression valve removal tool to remove the compression valve. Touch device users, explore by touch. Tighten a fork tube in place using the pinch bolts. Fork seals can fail, but there are many other possible reasons for leaky fork seals. Please enable Cookies and reload the page. 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. Maybe you just had them serviced. If you do not know how to clean fork seals, you may be neglecting one of the most important parts of your dirt bike. Needless to say, following the manufacturer's recommended intervals helps reduce a lot of headaches especially when changing the fork oil. 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 cap is loose, the upper fork legs slides down the lower fork leg. Learn how to change fork oil, how to replace fork … Once drained, refill using the correct fork oil weight and add the appropriate amount. You can add fork oil through the air bleeder with a small syringe. With the forks off the bike, take the air-bleed screw out of the fork cap. On some forks, it is possible to adjust the oil height with the fork still on the bike … Clean the cartridge (a parts washer makes this chore quite a bit easier) and replace all fork seals and bushings. Selected content copyright and trademark respective companies, used with permission. Dang, no dipstick. Cleaning your dirt bike fork seal must be one of your top priorities. If there is, you are in luck but if not, then you have to go through the troubles of opening up the entire piston … Always make sure to change the oil one fork at a time. SUSPENSION BASICS. 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. Fork parts only get a rudimentary cleaning before assembly. Clean is because you want to measure the oil that's taken out. Tip the fork upside down to drain the oil. Why you should change your fork oil. Put a fairly clean drain pan in place. Ok. Check out if the fork has an oil draining outlet. Hopefully you already bought the replacement parts otherwise ride day can wait. 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. Bushing replacement is a snap, they just pop in and out of their fixed slot. AS it ages, its efficacy diminishes over time. Once spotted, leaking fork seals need to be replaced straight away, and you should ideally replace the oil and seals in both forks … How to service forks. 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. Yes, the street bike oil was every bit as nasty as the dirt bikes. 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… Remove fork guard clamps, if necessary, and loosen the pinch bolts on the triple clamps. • Button everything up and put in a couple of hot laps noting how the bike … Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Begin typing to search, when autocomplete results are available use up and down arrows to review and enter to select. How do you measure the correct amount of suspension oil? There is an “Oil … I'm a fanatic about 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 … Cloudflare Ray ID: 617c37525c9c0bd6 Once you have done it, you have to refill the fork with … 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 you drain the forks then re-fill with 205 c.c. Remember, always refer to the manufacturer's recommendation. Since it is easy to change fork oil, I recommend you start with 10 wt along with the heavier springs. How to change FORK SEALS on Dirt Bike in 7 minutes - YouTube The manual recommends 5 weight oil but I have heard of 2 weight oil … It allows the rider to change direction, and also plays a role in braking and suspension. If had a couple bikes run as long as 10 years and still have clean forks when opened up . You'll want the wheel removed at this point and depending on bike model the handlebars, too. 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 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 … And if possible do not get the piston of the fork out. Once the bottom bolt is loose, you will need to … Measure the distance from the axle block to a point directly above it on the bike… There’s a lot of fork oil to choose from, and Rocky Mountain carries a wide variety. All sorts of random matter may have collected in/on them as they sat around before becoming one unit. It's a slow process so it's best to lean the fork on a wall while it drains into the pan. Selecting an options will take you to a new page. 10 min - to unbolt forks from bike. Forks Leaking Oil? The right tools are the key. 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. 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. 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. 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. 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. Old fork oil does affect your suspension but it often goes unnoticed. If ignored, the oil will drain out of the fork, severely affecting its performance, which can also make the bike unsafe to ride. 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. Bleed them by removing the bleeder screw, if necessary. 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 … 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. Exact shipping costs are determined upon checkout. 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. Video: What are PSF SFF forks? Performance & security by Cloudflare, Please complete the security check to access. But fork seals are some of the most neglected parts of a dirt bike… Dirt bikers are another story. Motorcycle fork oil isn’t a lot different than other kinds of oils. (9.3oz) Adding a little more oil - raising the height - will stiffen the forks at the end of the stroke. All Rights Reserved. Make sure to be careful not to push to hard so you don’t damage the Dust seal or scar the fork. To remove oil, you will need to remove the fork legs from the bike and turn them upside down to drain oil out of … Your IP: 123.30.50.74 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. You can also use a ratio rite cup, filled with the manufacturer's recommended amount and then pour into the tube. 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. 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. 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. Without proper care, you may shorten the effective lifespan of your bike’s fork … 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. Firstly, you will need to remove the fork from the bike. Copyright 2004-2021 MotoSport, LLC. Since them only Jeremy has been inside them. 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