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Re: Kawasaki Zephyr 550 remove and replace the front fork...
If you are just replacing the springs then its quite a simple step. put your bike on the centre stand, undo the top nuts on the forks with a socket but becarefull when you get near the end as the spring will try to shoot up,keep you weight on it, withdraw the spring slowly making sure you dont loose any fork oil. then just carefully remove the spring and replace it with a new one, reassemble as above in reverse order. ie put spring in place the nut back on and keep your weight on and slowly tighten, make sure you dont crossthread it. i think the nut is either 17 or 19mm.hope this helps
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Is you have taken the forks apart and changed the fork bushes, ie forks are totally dry, you will need about 520ml in each fork leg. When refilling and will the springs removed, add about 550ml per leg, the stroke the forks numerous times to expel any excess air. Then with forks compressed the oil level should be adjusted to 119mm from the top of the fork to the oil, ie the air gap to the oil. The add springs and spacers and reassemble.
you will need to remove the top cap off the forks to do this and the spring will just pull out thats on the conventional forks if they are the usd the same applys but you will need to undo the top cap from the centre stem with spanners to remove the spring hope this helps
buy some graduated plastic containers let all air out of forks put new empty container below forks and let it drip into bowl then pump forks up and down a couple times and this sounds squirt out the rest. now you now...but if you had a leak this will just be a ball park figure only. repeat same procedure for other fork...the forks on my bike do take different amounts!
I was told by many people it was a hard job. I didn't think so.
What you need is: New Seals. 8mm Allen Key. Half Inch Stocket bar AND Extender. Extra Fine Sand Paper/Polishing Device. Fork Oil + Measuring Jug. Threaded Bar with a Two 19mm Nuts Locked to each other on one end. Spanners. Screw Drivers.
How to do:
First Get the Front end off the Ground (ALOT, Center Stand on Bricks for extra height.)
Remove Front Wheel and Brake Calipers.
Open Drain Philips Screw on Base of Fork (Both Sides). Dont Lose Rubber washer under screw. Watch Out Also for Oil Being under Pressure.
Remove Nut from TOP of Fork (Alowing Handles and mirrors to come loose).
From Top you can see down tube has Nut/Cap with a Square Half Inch center. Use Socket Bar (and Extender if needed) without Bit to Remove reach in and remove. Watchout for Spring Pressure under the Cap/Nut.
Use Screw Driver or Hook of some kind to remove Preload Spacers, Washers AND Spring from Fork.
Slide your Threaded Bar with19mm Nuts (Make sure they are Locked Tight together at one end) down into the Fork and let it catch on the Oil Damper at the base. You will know when it's cought because you wont be able to spin the threaded bar anymore. This will stop the Damper from spinning while you undo the Allen Bolt at the very base under the fork (Outside).
Use Allen Key to remove Bolt from Underside of Fork While having someone or somthing hold the Threaded Bar form spinning.
Now look at the Old bust/leaking Oil Seal. There will be a Clip/Locking Spring in a Groove holding it in place.
Remove Clip without Damaging any part of clip or fork.
If Everything above was Done, you can now give the slider( Bottom Part) a big tug and it will all come lose.
One Part of the Oil damper will either fall off, or be left in the slider(Bottom Part). It slides over the Damper in the base of the tube.
Remove Two Split Washers from base of Tube and Copper Washer. Remove Old Oil Seal.
Place New Oil Seal on Gently.
Replace back on Copper washer, followed by two split washers.
Use Grease as a kind of glue to hold the part of damper that fell off back on.
Slide Slider back onto Tube.
Screw Allen Bolt back into base of slider as per originally was (Remeber to hold Threaded Bar if it starts spinning)
Push Gently new Oil Seal into Fork Slider for Snug Fit. Be Gental.
Replace Clip/Spring over top of Oil Seal Locking it in place.
Remove your threaded bar from top of Fork.
Replace Spring into Fork.
Replace Philips Oil Drain Screw into base of fork (Dont forget Rubber washer).
Now: For a GT550 (I am told also KZ550 but can confirm) you need 300ml of 15 weight Fork Oil. EACH Fork. So a Total of 600ml whole Job. IN EACH SIDE YOU WILL ADD ONLY 300ml of FORK OIL. (15w)
After this. Replace any washers, Preload Spacers and so back into for.
Replace Cap/Nut into Fork Tube with Socket Wrench and Extender.
Replace Handles and Moirrors and Nut holding both of these.
Replace back onto bike the Front Wheel
Check Brake Calipers for leaks and Pad Wear. It's Very Cheap to get new Pads. Not cheap to have months off work after a crash.
Replace back onto bike Calipers.
Pushing Bike (Not ride) test Brakes and Suspension.
At This point I am thinking your done. You may need to Add Air Preload into the Fork via the Air Valve. 4PSI is a Starting Point. I have run upto 15psi. Without Air in the Preload you may find it too soft. Upto you.
The correct way is to remove the tops of the forks and pull out the springs,then fully compress the fork legs and fill them to 150mm or 6inches from the top. Refit springs and tops and you are ready to ride.
The anti-dive valves are easy to remove...
Place the bike on her center stand, and raise the front wheel with a jack under the front of the engine/exhaust.
first loose the 3-way connector on the lower fork part ( brakefluid ).
Remove the 2 screws that hold the upper part of the anti-dive system to the lower part. You'll see the plunger. When braking, that plunger should move about 2mm out. It must be possuble to push it back in place with fingerpressure. Then that part of valve is OK. All the parts of the plunger are separately available by a Kawasaki dealer.
The lower part of the ADVS is also easy. Just remove the 2 screws holding them to the fork tubes. The fork oil will drip out...
When reassemble, dont forget to bleed the brake hoses at the top of the plungers...
To remove the springs...
Loose both screws on the upper fork clamps.
Remove the rubber stops on the air valves
Bleed the air out of the fork pushing the air valves ( some have only 1 air valve, and an equilibration tube just below the upper fork clamp )
Remove both fork spring stops. Caution, hold them firmly down while unscreing, to avoid the stops jump away at the end of the thread!
On reassembly, the stops must be screwed at 2.3 DaN/m (17 lbf/ft ).
The quantity of oil is exactly 348cm³ in each fork. Must be filled without the springs. Push then the fork several times up and down to pump the new oil in all the valves. Then with the fork down, measure the hight between oil level and top of fork. That must be 379mm.
Hope this all helps...
Don't know about an air valve at the bottom of fork tubes...