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#318 |
Join Date: Feb 2016
Location: George West, Texas
Posts: 4,097
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Is it about what you expected as far as wear? You have put some pretty heavy duty on it this last year.
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***************************************** 2015 Bashan"Blaze" BS250GY-31 (DB-07K-250) GONE 2017 Suzuki V Strom 650 XT "We are all born ignorant, but one must work hard to remain stupid." ~Benjamin Franklin~
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#319 | |
Join Date: Oct 2016
Posts: 547
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Quote:
The oil I poured out of these forks looked quite dark. When I take the other side apart I plan to get a good measurement on the fluid capacity. |
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#320 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Are those Showa Forks? If not, they could be a dead nuts ringer for them. I would almost bet that valving and springs from the aftermarket would drop right in and work on those things.
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#321 |
Join Date: Oct 2016
Posts: 547
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Not Showa. FastAce is the brand. They aren't exactly like the Showas but close. I'm sure springs and seals for 47mm forks would work.
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#322 |
Join Date: Oct 2016
Posts: 547
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Fork Off!
Ran down to the local moto shop this morning to get some fork oil and a tool. They had this KTM Freeride out front and I like the idea so I asked how much. $6500 for a used bike. Nah.
![]() So I tore the other fork off. This side has never leaked so I used a Ride-Rite measuring cup to record the stock fills. ![]() ![]() The outer chamber only had about 200cc in it!! This might explain why they feel so plush. (Similar Honda forks call for 318-380cc depending on what bike you look at.) ![]() Sunlight helps: ![]() Last edited by ChondaChondaChonda; 01-13-2018 at 03:15 PM. Reason: add specs |
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#323 |
Join Date: Oct 2016
Posts: 547
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Inner Chamber
Also opened up the inner chamber and poured the oil into a measure cup; after stroking the fork and letting it drip upside for about 20 minutes it looks to hold about 160cc.
![]() So now I'm left with a few decisions. I've been reading as much as I can absorb about shim stacks and how they affect performance. In general, I quite like the way the forks work with the exception of how it handles sharp edge bumps; it's not bad. Just wonder if it could be better. My mess: ![]() |
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#324 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
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#325 |
Join Date: Oct 2016
Posts: 547
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Shim stacks documented
LXR250 Shim stacks- FastAce ARX01RC forks
Base Valve Compression Stack (as found stock) 12mm Inside Diameter shims x 34 18 - 31.90 x 0.12mm shims 1 - 20.0 x 0.16mm shim - (Crossover) -*Interactive stack 1 - 31.90 x 0.12mm 2 - 29.90 x 0.16mm 2 - 27.88 x 0.15mm 2 - 25.90 x 0.15mm 2 - 23.88 x 0.16mm 2 - 21.90 x 0.15mm 2 - 20.0 x 0.15mm 2 - 17.96 x 0.15mm Single 31.90 x 0.12mm check plate and spring on back side of valve Rebound stack (on Mid Valve) 2 - 19.9 x 0.10mm 1 - 13.9 x 0.10mm 1 - 19.9 x 0.10mm 1 - 15.96 x 0.10mm 1 - 13.92 x 0.10mm 1 - 11.85 x 0.49mm Single 19.9 x 0.10mm check plate against a bellville washer spring. Main spring is progressive 42mm Outside Diameter x 545mm long (free standing) with a 32.1mm Inside Diameter *-Interactive crossovers have a shim diameter larger than the stack clamp. That allows force transfer directly through the crossover shim into the high speed stack before the crossover closes. Direct force transfer makes the stiffness of the low speed stack a function of high speed stack stiffness. Under those conditions changes to the high speed stack or clamp end up effecting low speed damping as well. -by Clicked author of ReStackor software Last edited by ChondaChondaChonda; 01-14-2018 at 09:53 PM. Reason: add |
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#326 |
Join Date: Oct 2016
Posts: 547
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Almost...
Just about had the first fork all re-assembled tonight. Had to quit when I realized that the new seals were too small.
![]() ![]() ![]() ![]() Had a good flow going too. ![]() So I will post a few pictures and comments. All of the teflon slide surfaces in the fork looked to still be in excellent condition despite my best efforts at abuse and neglect. ![]() I added these cool cats to my tool collection: ![]() The *one* anomoly that I found between the two forks; ![]() 14 coils at 27.5mm OD and 4mm wire *calculated rate 1.41kg/mm Not sure why one is longer than the other. ![]() ![]() ![]() ![]() Last edited by ChondaChondaChonda; 01-15-2018 at 09:05 AM. Reason: pressure spring measurements |
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#327 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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You would have to try a lot harder to start to wear those teflon seals down. Teflon is a fairly tough substance when it comes to abrasion wear.
The two springs being so different is definitely interesting. Same wire diameter and same number of coils. The coil spacing looks different, so either one sagged, or was made in a different batch. I think it is just a little evidence that while these forks are definitely a cut above what comes on most of these bikes, there are still areas where material quality or manufacturing consistency still needs to catch up a little bit. Lots of great info as well, you are definitely providing a great service to others that may get one of these bikes in the future. ![]()
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#328 |
Join Date: Feb 2016
Location: George West, Texas
Posts: 4,097
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Gread workup. So are you going to stretch that spring and make it equal? Drop a bar steel in among those coils and put your feet on either side, put your back into it and ...perfect length.
response to above post , this is great that you can find replacement parts !!!
__________________
***************************************** 2015 Bashan"Blaze" BS250GY-31 (DB-07K-250) GONE 2017 Suzuki V Strom 650 XT "We are all born ignorant, but one must work hard to remain stupid." ~Benjamin Franklin~
Last edited by BlackBike; 01-15-2018 at 10:58 AM. |
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#329 | |
Join Date: Oct 2016
Posts: 547
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Quote:
I wonder if it was caused by running it with the leaking seal? On the last ride I bottomed hard on a big G-out that the bike normally would have shook off. It's feasible that not having enough fluid in the outer chamber allowed the inner to see pressures way above design and over compressed the spring on that fork. Just ordered a set of 1.61kg/mm pressure springs on ebay. Factory Connection brand for $27; I'll definitely try to figure out a way to measure the rate on the stock FastAce springs. (found to be 1.41kg/mm after this was originally posted) I used the Racetech chart recommendations that are based on rider weight to pick the 1.61 - oddly they only have 1.4 and 1.8 and I fall right in the middle of both. Last edited by ChondaChondaChonda; 01-15-2018 at 09:06 AM. Reason: add |
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#330 |
Join Date: Oct 2016
Posts: 547
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Finis
Ok, so it turns out that these Pitster Pro LXR 250 forks are fairly close cousins to the 47mm forks that have been coming on Japanese bikes since, well... 2000?? or so??
Anyways, I took a chance (Again) and ordered up a set SKF seal kits for a 2007 CRF250X. Picked them up early this morning: ![]() Managed to get the forks reassembled and the new seals installed. Even started to put them on the bike before I realized that it was a good time to service the steering stem bearings. Lots of good grease still in there. Thread sealant on everything...very impressive for any bike at this price point. ![]() ![]() ![]() ![]() Bearing is 32906X with an FP on the other side. Fresh Waterproof grease packed into both upper and lower. Took at test ride and it feels pretty good. Still very plush and predictable on the street. No leaks!! No good place to test off-road locally (in winter) so I mostly just scootered around town. I need to spend some time with a screw driver playing with the clickers. I'll install the new pressure springs when they get here. Nice thing about this design is that it will be fairly quick and easy to pull the base valve and make adjustments to the compression stack or swap pressure springs. Last edited by ChondaChondaChonda; 01-15-2018 at 06:11 PM. Reason: add bearing info |
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Tags |
efi, fuel injection, lxr250, pitster |
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