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Replace the Fork oil seals. It will require you to support the bike from the headstock and remove the forks. You will also need to know the correct amount of fork oil to put in each leg. Buy the manual for your bike (whatever it is) it will cost about 20GBP. a new set of forks will cost considerably more.
Hi, all model VS 800 from1992-2000 take the same amount of oil in the front forks, using 10 weight fork oil measure into a clean measuring device or mark the side of the oil bottle 413 mls, pour this caerfully into 1 fork, and the same amount into the other fork, 413/413 cm (3)
If you are saying that your front suspension is too soft, you can change the fork oil in the front forks to a heavier viscosity. I think Harley recommends Type E fork oil. I've found that PJB 30 wt. fork oil works best for me.
Since I'm not familiar with the newer forks, I'll have to recommend that you ask the dealer how to drain and refill the forks and how much oil to put back in them. There are usually two amounts of oil to put in the forks. One amount is a "dry" amount to add when you disassemble the forks and then refill them. The "wet" amount is for when you simply drain the forks and then refill them. Naturally, the "wet" amount will be less than the "dry" amount.
Sorry I couldn't give you more information but my expertise is the earlier model Harley bikes.
First of all do not add oil to your front forks with out draining them first. If you over fill your forks with oil you will damage your forks. To change your oil in your forks, first center stand the bike and lift the front wheel by putting a jack under the motor. Remove the front wheel and axle and put a pie tin under the fork tube. Reach up into the bottom of the fork tube with a hex key and loosen the screw but do not remove. Now take the air pressure cross over tube off, this will allow you to unscrew the fork tops( On some bikes you may have to put a towel on the tank and unbolt the handle bars to get them out of the way.). Pull the screws out of the bottom of the forks and gently pull down the oil should come out now. If you need new fork seals take the lower tubes off and replace(You may need to take off the fender and hang the calipers with wires.). Turn the lowers over and dump out the oil and reinstall fork lowers. Snug up screws and sealing washers on the bottom of forks you can not tighten till you put on fork tops. Now pour in measured amount of oil, again do not over fill. Put on fork tops and air crossover tube. Now tighten screws on bottom of fork. Finish reassembling bike.
FORK OIL
• Place the front fork vertically without spring.
• Compress it fully.
• Pour specified front fork oil up to the top level of the outer
tube.
Capacity (each leg): 490 ml (16.6/17.3 US/lmp oz)
99000-99044-L01: SUZUKI FORK OIL L01
or an equivalent fork oil
• Move the inner rod slowly with the special tool ten times and
more until no more bubbles come out from the oil.
09940-52841: Inner rod holder
NOTE:
Refill front fork oil up to the top of the outer tube so that bubbles
are visible while bleeding air.
• Refill specified front fork oil up to the top level of the outer
tube again. Move the outer tube up and down several strokes
until no more bubbles come out from the oil.
• Keep the front fork vertically and wait 5 – 6 minutes.
NOTE:
* Always keep oil level over the cartridge top end, or air may
enter the cartridge during this procedure.
* Take extreme care so as to pump out air completely.
• Hold the front fork vertically and adjust fork oil level with the
special tool.
NOTE:
When adjusting the fork oil level, compress the outer tube fully
without the fork spring.
Fork oil level: 153 mm (6.02 in)
09943-74111: Front fork oil level gauge
You just needed to.... remove front wheel, support bike on something, undo retaining bolts on forks, tap out fork legs from the top, using a soft mallet. Take out fork seals with a seal pick, (halfords) Replace old seal with new seals, in reverse order) sliding over the fork leg, tapping into place. Then put replace forks etc in reverse order (from dissassembly). Hope this helps
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