Shock absorbers -99 ST1100 ABS with km 105000 …

increasing

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Oslo, Norway
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ST1100AX
As my profile shows, I have a 1999 Honda ST1100 ABS with 105,000 kilometers on the clock and according to all three previous owners with the same owner from 2003 until I bought the bike in May 2025 this year, no repairs have been made to the shock absorbers.

I have only ridden the bike 250 kilometers but what I noticed at good speed in a right turn with a dump after the winter was most likely the center support hit the asphalt and the rear shock absorber did not behave as expected, no visible external leaks on the rear shock absorber.

I have been working on the bike for a while now with service work and a backlog of maintenance, new errors appear during disassembly cleaning repair. Now the latest discovery is a leak on the left front shock absorber. Considering the age of the bike, kilometers driven and no known previous repairs to the shock absorbers, it is time to do something here.

I'm thinking of replacing the rear shock absorber with a new complete shock absorber or possibly overhauling the original Showa shock absorber if someone can do it, lots of info here on the st-owners forum.

I'm not sure about the front but I see new springs with oil being sold as a kit, I've overhauled front shock absorbers on motorcycles from the 70s so all the gaskets and seals must of course be replaced. When I look at the split drawing of the front shock absorbers I'm unsure of what I have to order to overhaul and what is nice or sensible to bring in terms of parts.

What is recommended to change to get the bike ready for new trips on the road, not thinking about the most expensive or best thing to get, just want a bike in good condition?


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Well, at that mileage the rear shock absorber is definitely done...
Its not serviceable, thus replace...
Should you choose to go for one with a more progressive/sporty setup, I'd recommend fitting fork springs to that...
Thanks, think the standard setup is ok for me and I will get a new rear shock :thumb:

After reading a lot on the forum here and looking at prices with shipping on the different rear shock, I ordered Hagon M61097 from UK who are very helpful with quick responses and delivers to my specifications (weight of driver, no passengers + luggage).

Then I have to put together a list of parts for overhauling the front shock (front fork), I'm a bit tempted to replace the springs when I first disassemble... I've searched for a «rebuild kit» or «overhaul kit» without finding a complete kit yet …

At the bottom of the right fork leg there is a piston / valve (Anti-Dive) "Part number:51530MAJG41" is it something that requires some kind of action?

If I have to buy parts from several different places, shipping will be more expensive.

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I'm a bit tempted to replace the springs when I first disassemble...
Just measure their length, standard and wear limit are given in the w/shop manual...
I've searched for a «rebuild kit» or «overhaul kit» without finding a complete kit yet …
"kits" offered (i.e. eBay) are often aftermarket... buyer's choice...
I usually seek best offers on the individual OEM part numbers...
At the bottom of the right fork leg there is a piston / valve (Anti-Dive) "Part number:51530MAJG41" is it something that requires some kind of action?
I cleaned all thoroughly and replaced anything made of rubber/Viton: seals, O-rings, etc...
Often omitted/overlooked are #29 & #42...
The needle bearing up in the fork leg is usually OK, if it had been lubed frequently...

It ain't rocket science, but requires patience, care, a few good tools... and makes a mess... ;)

Loosen top triple clamps, then loosen fork caps (don't remove yet), then I'd remove a fork leg and loosen the hex bolt in the bottom holding the damper/insert, then upright again to remove the caps, pour out the old sludge, etc...
Wash with lots of brake cleaner or petrol, blow each part dry, wipe down with some fork oil to prevent corrosion if left over night...

Tip for assembly: after filling new oil pump the damper till you feel/hear that all the air is out, store vertical from then on.
 
I doubt you will need to do anything with the TRAC system. If I was overhauling front forks I would replace top and bottom bushes (#16 and 17) as they are wearing parts, along with the seals (#35). You will need new copper washers (#45) as well. New springs (e.g. Hyperpro) would be a nice add-on.
 
Parts for front shock (front fork)

2 stk BUSH GUIDE Part number: 51414MN1671
2 stk BUSH SLIDER SHOW Part number: 51415KS6831
2 sett SEAL SET FR FORK Part number: 51490MZ1305
2 stk WASHER SPL 8MM Part number: 90544283000
1 stk RING STOPPER Part number: 51445MJ0003
1 stk BUSH RUBBER Part number: 51545MJ0003
1 stk RUBBER STOPPER Part number: 51441ML7013
1 stk BOOT PISTON CASE Part number: 51442MJ0003
1 stk O-RING Part number: 91304ML7003
1 stk O-RING Part number: 91356KF0003

(2 stk SPRING FRONT FORK Part number: 51401MAJG41 «measure length«)

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Hoping to get an order in one of the first days of Honda original parts for the front fork except for springs as I hope they are within tolerance measurements 474.2 - 464.7 If not they will have to be replaced. Since I have only used Putoline products on the bike I will continue with Putoline Fork Oil HPX-R 10W.

Would like input on my list of parts for the front fork and guidance for performing the job, links to description or video. Picture for attention :thumb:

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I'd definitely add
2 stk 91254ML3791, seal, dust
to that list...
48 SEAL DUST Part number: 91254ML3791


I added it to be sure. I'm almost sure it's in this set with number 35 which includes 2 pieces and the one you're referring to has number 48... See link and split drawing:

 
I'm almost sure it's in this set with number 35 which includes 2 pieces and the one you're referring to has number 48... See link and split drawing:

Indeed! I stand corrected, didn't remember those are sold as set as well.
 
Mine is a non abs 2000 y model, part number is different from your abs, just did the fork seals recently.

If you buy from Honda/oem, the dust and oil seal comes in a pair together. I see your lists included the bushings, highly recommended to replace those bushes if you don’t know your bike history, mine has never been replaced and the bushes was worn badly, especially the lower bush.

The bushes for my non abs part number has been superseded with new pn from Honda, fyi.

Also might be a good idea to order the bottom screw and crush washers just for peace of mind, one of my screw head was rounded, had to bring to machine shop to get it out & find a used replacement screw (wasted some time). You’ll need a long 6mm socket Allen key/wrench to reach the screw/bolt.

You might want to get a seal driver tool(43mm for abs) or maybe you can diy, I bought a cheap 41mm driver from AliExpress and it works fine.

Sorry for the long read increasing.
 

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Nice ! Hva kostet herligheten? Your getting ahead of me. It's about time for a new rear one on mine too.. I got all the seals and bushings for the forks ,but putting the job off. Riding instead - time is running out ! I have not been able to get the anti dive piston from the places I buy parts,
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Rear shock absorber from Hagon in the UK, see link for price:


All the front parts were purchased from Webike in Japan:


I look up each original part number from CMSNL parts catalog:


You can find the catalog for your bike by entering your VIN number in the search field at the top of the page. All the front parts with Anti-Dive for mine bike NOK 12 - 1300,- plus shipping and Norwegian VAT (25% mva)
 
Credit to Pirelli...
Which an ST will eat within the first 300km... (they literally melt away...)

More in this scheme:

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Power?? More like: power is nothing without control or 1/3 ton feels heavy without control :rofl1:.
Rather 'sufficiently motorized for all driving situations'... (and I let you guess where that quote origins :p)
 
Which an ST will eat within the first 300km... (they literally melt away...)
Since you appropriated Pirelli's campaign for the sake of the ST, I have to ask... why would someone put Pirelli's on a ST? Not even Pirelli has a recommendation in their application chart. And I hope you're not suggesting it's the ST's power that would cause that accelerated wear... if so, I have a bridge for sale, cheap, lolol.
 
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