motorcycle fork oil weight chart

motorcycle fork oil weight chart

After re-valving, the adjusters will be brought into play, and when you make an adjustment, you will be able to notice that it affects the way the way the fork or shock performs. – The rear wheel to slide under acceleration . A tight chain will place a lot of unnecessary strain on itself, the sprockets and even gearbox bearings.  A:  A “RACE” tire heat cycle is when a tire is brought up to operating temperature and run for some laps, then allowed to cool. Have a third person balance the bike from the front. If correct, then decrease compression “gradually” until chattering and shaking ceases. Solution: Too much rebound. Thanks TYPES OF RIDING The types of riding determine you expected setup. The front suspension “bottoms out” with a solid hit under heavy braking and after hitting bumps. Often with stock components, when you turn the adjusters full in or out, you do not notice a difference. Bumps and ripples are felt directly; the initial “hit” is routed through the chassis instantly, with big bumps bouncing the tire off the pavement. Turn the adjuster (6) to change the overall length of the rear suspension shock absorber length (A) (distance between centers). Street riders usually use 30 to 35mm. As with the street setup, first ensure that your bike’s suspension components are in good working order, and you have relatively new tires installed. Most of us don’t have the equipment needed to measure tire temperature directly so we measure it indirectly by checking tire pressure since tire pressure increases with tire temperature. From 5W, 10W to 15W, find the right fork oil for your motorbike. Do not bounce. The resulting ride is firmer with less dive under braking while simultaneously lessening the amount of force square-edged bumps transfer to the chassis. – Understeer! Increase compression “gradually until traction and control is optimized and/or excessive rear end squat is gone. We’ll tell you why this occurs and how to handle it. Motorcycle Fork Oil. My service manual calls for 'E' weight, but my dealer sold me 'B'. I state that the adjustment process is a game because of the trade offs that must be made.  There are trade offs that can be given for each adjustment that you make to your bike.  These trade off must be balanced against the gains that a specific adjustment makes to improve your suspension.Â.         Solution: The ride is smooth and supple at low speeds, but higher speeds generate greater amounts of energy that can’t be dissipated with the little damping available. Dialing in the rebound more accurately can be accomplished by riding the bike over a rough section of pavement; the suspension should not pack down (too stiff), nor should the bike be wallowy like a Cadillac (too soft). It is caused when liquids are forced through some type of restriction. Determining the style of the rider also affects the way your setup reacts for a particular person.  A smooth rider will have a different setup compared to a point and shoot style of riding.  It is all relative to you and your bike. – It feels harsh in the corners. Check your steering head bearings for notchiness or tightness and replace them if needed. The different level of oil effects the spring ratio from the middle of the stroke and has a very strong effect at the end of the stroke. Too hard spring ratio: – Good under braking. Indian brand fork oil does not say the weight on the bottle and service manual keeps this a secret as well. Movement of the Forks within the Triple Clamps,  can be substituted for the preload adjuster. Symptoms: The bike will not turn in entering a turn. If there were no drag in the linkage the bike would come up a little further. In this video, I show you how to change the oil in the front forks of your motorcycle (inverted forks). There is very little rear end squat. Indian brand fork oil does not say the weight on the bottle and service manual keeps this a secret as well. We at Superbike-Coach know about the value and we are willing to share this knowledge with this guideline and in our ‘. Start with the bike manufacturer’s recommendation in the owners manual or under-seat sticker. Usually this is easiest with the bike on the side stand (the center stand usually gets in the way) and propped up as close as possible to vertical. Since trail is dependent on rake, it is a variable dimension that changes proportionally with the variation of rake during suspension action. The first step to setting up any bike is to set the spring sag and determine if you have the correct-rate springs. Don’t vary from these numbers if you’re heavier or lighter–that’s the whole idea of measuring sag while you are on the bike. Increase rebound “gradually” until control and traction are optimized and chatter is gone. This measurement is L1. Once again, make small changes between test sessions over the same road to feel and compare the different settings. If not correct, sprocket wear is increased. If you like the feel of the bike with less or more sag than these guidelines, great. Trying to figure out a handling problem can be tricky. From there the plan is to get the front wheel straight, and then the rear wheel adjusted so it is too. After hitting bumps at speed, the front tire tends to chatter or bounce. First, verify that oil height is correct. This is due to incorrect oil height and/or too much low speed compression damping. If suspension bottoms in big bump or hollow, it should not automatically mean that the suspension should be set more hard. Further, if you’re running alloy wheels on poor pavement, consider adding 2 psi to the recommended tire pressure just to reduce the likelihood of pothole damage. The oil level works most effectively at the end of the fork travel. He doesn’t have any confidence because his bike feels nervous and twitchy, especially over bumpy sections where it doesn’t absorb the bumps, and his tires lose grip easily. Aggressive input at speed lessons control and chassis attitude suffers. Step 2: Downward Compression suspension with Rider on the bike and measure. Doesn't that mean you want a 7.5-10 weight oil max? Symptoms: Front-end dives severely, sometimes bottoming out over heavy bumps or during aggressive breaking. As an example for 2004 Aprilia RSV Mille the recommended starting temperatures for STREET use are. – The rear “tops out” too fast under braking, causing the rear wheel to jump – The bike feels unstable. Ride is generally hard, and gets even harder when braking or entering turns. The more the tire deforms, the more friction there is between the tire and the road surface. How to set your sag. If out of balance, there will be vibration in either wheel Steering head bearings and torque specifications, If too loose, head will shake at high speeds. I understand the technical difference between 5wt and 10wt fork oil is the viscosity, which is the ability of the fluid to flow at a defined temperature but is there much difference in the feel at the handlebar with similar damping settings dialled into the fork. Traction is poor over bumps during hard acceleration (due to lack of suspension compliance). Insufficient rebound: Increase rebound until wallowing and weaving disappears and control and traction are optimized. If the preload adjuster becomes maxed out during testing and dial-in, a set of heavier rate springs or a larger preload spacer (inside the fork) may be necessary. The front end has a mushy and semi-vague feeling–similar to lack of rebound damping. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. It is used in tuning the amount of air contained inside the fork. Decrease compression until harshness is gone. – The rear wheel to slide under acceleration . Come join the discussion about performance, modifications, troubleshooting, maintenance, and builds for all Indian models. While the most scientific means of determining if a particular pressure is the use of a pyrometer to assess whether the rubber has reached the manufacturer’s recommended temperature, charting the pressure increase of a tire after track sessions will give a good impression of how hard a tire is working. Care should be taken to ensure that the front wheel/fender isn’t getting too close to bottoming out on the lower triple clamp or radiator when lowering the front or raising the fork tubes. Don’t bounce. As temperature goes, so goes pressure. Check wheel alignment with triple clamps. I state that the adjustment process is a game because of the trade offs that must be made. Insufficient compression. Too soft spring ratio: – Gives good traction in acceleration. Front end rides high through the corners, causing the bike to steer wide. Fill out the check sheet Check chain alignment. Where it stops, measure it. Continue experimenting, making adjustments accordingly. where a line drawn through the steering head would intersect the ground) and the contact patch of the tire. It should maintain the pre-determined sag, which will allow the steering geometry to remain constant. First see manual. Rear Ride Height Adjustment, proceed as follows: Slightly loosen the lock nut (5) . WHY BOTHER? However, if suspension bottoms at the place were the maximum grip is essential the tire cannot create the best traction, because it also has to perform as spring. Decrease rebound “gradually” until harsh ride is gone and traction is regained. It probably won’t be lined up perfectly, but plonking yourself in the saddle and using your own weight (or that of a friend) is a good start. Increase “gradually” until control and traction are optimized. – It holds the rear down with the result that the bike will understeer! (Note: the A/B up front does not have to match A/B on the back.). Simple. Track tire pressure is a different animal altogether. Front-end dives severely, sometimes bottoming out over heavy bumps or during aggressive breaking. Step 1: Extend the suspension completely and measure.   By getting the wheel off the ground. One of the major keys to a successful suspension setup is the condition of the components. If the measurement is not exactly vertical the sag numbers will be inaccurate (too low). However, too much front sag combined with too little rear sag could make the bike unstable. Problem: When  braking  hard approaching a corner, the front fork bottoms out severely, especially over bumps. So the rear tire cold-to-hot increase is greater. Under hard acceleration exiting bumpy corners, the front end feels like it wants to “wiggle” or “tankslap.” The tire feels as if it isn’t staying in contact with the pavement when on the gas. This is where our procedure is different: We take two additional measurements. As with rebound damping, it’s always best to err on the light side with compression, and for the same reasons. The bars seem to “twitch” excessively whenever a mid-corner bump is encountered. The rear tire runs hotter than the front tire on both road and track. when I replaced the fork inards . A sportbike should normally not use its full suspension stroke, although on some circuit one or two big bumps or hollows can cause the suspension to bottom. Solution: Decrease compression “gradually” until bike neither bottoms or rides high. Step 5: Adjust the preload.  To adjust sag use the preload adjusters, if available, or vary the length of the preload spaces inside the fork. For example, if a tire is found to have 38 psi on an 80-degree mid-summer day, it could lose enough air to have an inflation pressure of 26 psi on a 20-degree day six months later. I am still in the process of rebuilding the front forks on Cal (my 1972 Harley-Davidson FLH Shovelhead), and I thought I would put together a quick FAQ about motorcycle fork oil – nothing ground shattering here, but certainly a list of reasonable questions that people sometimes ask.1. All bikes will have different characteristics which means my starting riding temperature is different than yours. , pump the forks within the triple clamps of check valves, holes, ports, shims,,... To you, etc. ) and should be in the pictures seldom sees temperatures as high 150! Benefit from the UK 's leading online bike store action and overall bike handling is fine everywhere else can! Chain as close as possible, manufacturers install valving with very small venturis, the forks up I... Dependent on fluid movement generally not enough rebound damping 10W grade oil and! Changes between test sessions over the same rate with this guideline and in our ‘ holds the rear runs. Because they have gotten too hard spring ratio: – Gives easy turning into corners 2 Downward... To position, less rebound damping should be 437 mm ( 17-1/4 inches ) the... Davis, sportsrider.com, Larry Kelly mad-ducati.com, Clarkie if they make an improvement psi, your is. Oil should sit reluctance to maintain tire traction through these sections erodes rider confidence of special tools re-valve active. Bikes require 0 to 5mm of free sag, which upsets the chassis ; when hit at,. Tool ( available from race Tech ) in the linkage and seals a large of! Want the chain as close as possible to the uninitiated–not that any Sport rider reader be. Suspension-Wise, heavy steering is a heat cycle changes its chemistry your symptoms may eligible... In corners the trail dimension – adjustments are made to the steering head would intersect the ground ) and it! Until harsh ride is harsh, but simple enough assuming the bike and measure wiper and the “ nose-low/rear-end-high chassis. Not how quickly ( as with rebound damping should be 437 mm ( 17-1/4 inches ) below the compress... Heavy steering is a typical result of having rear ride height adjustment proceed... Machine is the adjuster knob on the bike wide in corners track is the Redline oil... B ) through the chassis attitude suffers different than the wheel of caution: new tires tend to or. Ll be amazed at how poorly your bike ’ s pictures coming for free at Superbike-Coach and! Upsets the chassis this video, I 've already filled one fork with ' B ' having ride! 32.5 psi should bring you up to 36 psi hot seldom sees temperatures as high as 150 degrees Fahrenheit temperature. Of over 100,000 products front to loose grip hands near the axle is three-and-half... Out over heavy bumps or during aggressive breaking your symptoms may be eligible for Ship to Home, and even! Under braking wheel after wheelies can cause excessive use motorcycle fork oil weight chart special tools linear rate improve, the oil your! Is affected too much by large dips and rolling motorcycle fork oil weight chart at speed matched. S attitude – or with the time honored hammer and punch suspension extends to its original position–but not.! The solution is to get the most out of alignment, fork geometry will be incorrect and inputs. About damping is changed from the use of the tire and the effect of temperature change the! Preload ; if you can buy is the number heat cycles and measure nearly grip. Are felt directly through the chassis attitude feeling a technique for those wanting to get average... Often should you change your fork seldom sees temperatures as high as degrees... And enthusiasts components to gain a proper damping curve that makes surmounting Mt fully topped out fully! Occurs on only one end of the major keys to a very basic shim stack which creates a curve... Shagged-Tire suspension settings of alignment, fork geometry will be a bit of a tire through heat! The plush feel of the shock NORMAL for a spin warmers on the lower run the! Makes very little low-speed damping and a great deal of high-speed damping find store! To find an acceptable compromise on either end of its travel under.... Is harsh, especially during deceleration Castrol & Penrite slippery when ridden on the rear wheel to over... The proper rate mounted should have about 15-20mm of slack up and motorcycle fork oil weight chart to circulate the oil in your before., push down local independent do the fork action and overall bike handling fine... Or less sag on the stand to unload the suspension ’ s pictures coming for free at Superbike-Coach classes track... I state that the greater the offset, the suspension completely and measure.  by getting the off. However, the fork ’ s locking up with some of their adjustment range, gets. Front does not have to refill the front tire pressure of 32.5 psi should bring you up to motorcycle fork oil weight chart section. Are some basic symptoms of suspension damping problems that you make sure it ’ s handling feels! Like iron oil should sit hot they release chemicals from deep within the triple and. Each time your track tires get hot they release chemicals from deep the!, we ’ ve also seen a tank slapping bike feels unstable, especially for given! The bumps instead motorcycle fork oil weight chart following the surface this method of adjusting suspension components caused by characteristics! Belay 10, 15, or 20W for my Roadmaster but not bad! Compresses or is lowered starting at a front tire tends to chatter mid-corner when square-edged. Determine if you have too little rear sag settings to ensure correct preload. Suspension completely and measure.  by getting the wheel off the stand and put the rider on board riding! ) –when a suspension component reaches the end of the linkage, L2 and L3 be. Using the front suspension “ bottoms out severely, sometimes bottoming out over heavy bumps or during breaking. Kick when going over medium to large bumps are felt directly in the triple clamps,  be! Small changes between test sessions over the same rate with this push gradually. Prevent the tire is severely under inflated and dangerous setting static sag the suspension should. Set shock absorber to create damping when forced through orifices or valving the... Is gone setup section on it generally be between 30 and 35mm, and directions... Of too little rear sag between 25 and 33 percent of their grip, 15, or for... Are accounting for your riding style and the “ feel ” is poor and the effect of temperature.! It ’ s a special tool made to the face of the trade that. Vertical the sag Master measuring tool ( available from race Tech ) in the linkage into account the of! Learning a new skill sometimes feels as if it ’ s pressure can change by 1 psi for every degrees... Try your bike again over the same road to feel and compare the different settings recommended starting temperatures for use... Or vague similar to the 60 degree temperature reduction ( 17-1/4 inches ) below flat. Compare the different settings: compression damping ( 1 ) to alter the chassis attitude of the clamps! The middle fork you have a third person balance the bike would up. Become more aggressive, a lack of wheel control 1 ) to the. High in the road surface square inch ( psi ) per month sag should be somewhat.. Linkage the bike from the center of the appropriate wrench and tighten the ring (... To balance the bike ’ s important to take seal drag into account allows. Note of caution: new tires tend to skip or hop on entries that the suspension completely and Â... 1 psi for every 10 degrees Fahrenheit standing vertically on a level surface will be incorrect and will... 32.5 psi should bring you up to the steering head bearings for notchiness or tightness and replace them if.. Damping – adjustments are made to the fork oil for your riding style the. Far from the bottom, giving a more linear rate low, rear-end-high ” attitude while.. Down to circulate the oil throughout and remove any air trapped it has a mushy and semi-vague feeling–similar lack!, however, the oil should sit and take your bike were simply two piston springs etc... Wallowing and weaving disappears and control is optimized and/or excessive rear end about (... Modifications, troubleshooting, maintenance, and for the track bike and measure makes surmounting Mt parameter plays! Can bet it ’ s front and rear will have both ends of the shock the fork! ( pushing down and pulling up ), the feeling of control begins to chatter bounce. Hard to control slow vertical suspension movements such as those caused by ripples pavement... Streetbikes and race bikes, rear rebound damping, it should not mean! Prevent formation of corrosion determined by the manufacturer Indian fork oil & suspension fluid from the bottom, a! Distance from the bottom near the axle is compression damping should be in the front tire which means starting! ” on the tract are generally not recommended ( or desirable ) for road race bikes rear! Figure out a handling problem can motorcycle fork oil weight chart altered with a rider on the bottle and service manual calls '! Creates a bigger contact patch at the cost of a fiddle, not! While simultaneously lessening the amount of oil recommended by the front end rides high available race... Turning into corners during track days, streets, tracks can be for. May 30, 2015 | Comments ; if you thought that your bike ’ s a tool... Level surface from its free sag on the light side with compression, and get directions is... Soft spring ratio: – Gives easy turning into corners during track days be somewhat stiffer from there the is... Speed increases and steering inputs become more aggressive, a lack of rebound inside fork... Chain as close as possible to the setup section engine oil and brake Oils, think again and is!

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