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slodog

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About slodog

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    TT Bronze Member

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    fixin things
  1. slodog

    Unsettling Rear...

    Added in 3 face shims to the BV yesterday (totaling 16) and tested. It definitely feels much better up front. Also went back and rechecked the sag it was sitting at 114mm. Made the change to 104mm seated 100mm standing, with a static of 30mm and the back worked much better also. I still think that I will eventually need to add heavier compression valving to the rear at some point. I'll just need to scrounge up more shim before I do. Thanks everyone for all your great input. I really appreciate it!
  2. slodog

    Unsettling Rear...

    This is great, thanks! Spent a few years studying Engineering way back, and I forgot how much I liked this sorta stuff. Thanks again for taking the time to give me an explanation.
  3. slodog

    Unsettling Rear...

    Why would the re-valving need added compression both front and rear, with fork main springs 3 sizes up and the shock 5 sizes heavier, over the stock springs? Can't figure that one out... My thinking is that more rebound and less compression valving would be needed compared to stock due to the added resistance of the springs with compression and greater stored force on the recoil. What's up...?
  4. slodog

    Unsettling Rear...

    You are correct...no EPNP ICS installed here. Sold it with my last 09YZ450 to "sweeten the sale". Running the stock vanillas. So you're saying that I'm most likely blowing through the stroke on hard stuff giving it that super harsh feel; and consequently I need more face shims to add lsc to the BV...right? But, why only adding two? When you in fact needed to go back to stock, which is 18 face shims on the '09. (And what do you think of the 14.25 clamp...too soft or what?) Is this because you're perhaps using the lighter EPNP ICS? And thus needed a bit more LSC, such that it took all the original face shims of the stock configuration. Or was this on a bike with lesser face shims to start with stock, more specifically you ended up with only 15 total? I guess what I'm really wanting to get at, in a round about way, is why I shouldn't add back in all the BV face shims, totaling 18? Or is my thinking correct that because I'm running heavier (20N) ICS, I may need the face shims reduced just a tad to offset as opposed to running the EPNP with a heavier LSC stack...? And lastly, when you suggest that my Mid valve looks to be OK, are you also referring to the rebound valving portion? And do you think that 330cc's in the outer chamber is enough with the free pistons drilled per SPI specs?
  5. slodog

    twin chamber oil levels?

    +1 Rider Beware...it's addicting once you open them up for the first time and realize that you too can make a few changes that produce drastically improved results! You're gonna need a few extra tools to get into the inner chamber. You can find them around $20.
  6. slodog

    Unsettling Rear...

    No, they're the same on each. I just gave the range that I'm using like 8-12 out on BV compression. Sorry for the confusion.
  7. slodog

    Unsettling Rear...

    Well...it's not that hard if you read the post. Couldn't get the bike balanced front to rear with the current shock configuration. So, rather than jumping in and rebuilding the shock completely with all different shims, I opted to try and match the forks to it with the use of a MV rebuild using the Gen 3 spring and shims I already possessed, combined with a softer BV and Rebound valving. It seems to have helped things quite a bit thus far. It least the bike feels much more balanced. Just looking for the best ride possible...like everyone else on here. It's OK if you don't have anything helpful to add. Sorry if I frustrate you. It's frustrating to me at times as well. But, thanks for looking anyways. Happy riding...
  8. slodog

    MV springs

    Nobody has anything...?!
  9. slodog

    cross over or clamp shim?

    What bike is this referring too?
  10. slodog

    Unsettling Rear...

    Thanks James...how right you are! I'm thinking the shock fluid is a 3-5wt...had a local shop do the fill and charge and they use Maxima oil in a bulk 55 gallon drum. Not exactly sure what's the best rear sag setting, but I'm running about 108mm. I did try opening the shock rebound up a little and settled in at 12. Beyond 12 it starts to get a little too loose for my liking. So, as you've suggested, I set the rebound at 12, next opened up the HSC to 1.75 from 1.5, and then started on the LSC adjustment to fine tune. Latest testing has me sitting at 12R, 1.75HSC and 7LSC on the shock. Shock valving & charge is still the same as originally posted. But now the fork valving is different. So, now I'm working on the forks. Currently their at 8-14C/10R with 330cc 5wt oil. It feels OK...but I've ridden a better, plusher, and more stable fork setup on this same model bike in the past. The forks do bottom some on very hard landings, but nothing too jarring. Probably the worst they feel is a jolting harshness when striking a 4" rock at mid-speed, especially if I catch the front tire while turning. It almost snatches the bars right out of my hands. But there are other nagging issues as well... If I'm running through a long stretch of rolling whoops @ 12C/10R pulling 4th gear hard, it starts this crazy bad jolting, akin to head-shake, and I have to start shutting her down or totally lose control of the front end. But if I run through them again @ 14C/12R they feel way smooth with little to no jolting head-shake. Only problem here is, that I can't really ride this setup hard anywhere else; the fork just feels way too loose. If I'm ridding more technical sections of a track with bumps and turns and such...the forks almost have to be at 8-12C/10R to get the turning spot-on. Compression setting really just varies depending on how aggressive I feel that ride. I'm thinking my valving may possibly need better tuning...IDK. But, FWIW here's what I got using stock 20N ICS and .50KG mains... Base- standard with no passive bleed stack and softer overall to compensate for the heavier ICS and MV. (13) 32,30,28...16.11,14x.25 clamp, preceded by a single A20 spacer and (2)11.25 sitting on the stem base. MV- Gen 3 setup with SPI spring and 7.3mm collar with OEM base plate removed. 20.10,11.25, 20,18,16,14.11,(2)11.25, 17.30 RBD (2)20,13,16,14,12.11,10.25 Any suggestions...?
  11. slodog

    Unsettling Rear...

    Thanks, I too was thinking along those lines, but perhaps 10 36.20's at the start.
  12. slodog

    Unsettling Rear...

    But like what...really fast speed trail trash? I'm not saying 12 is where it's "good". It's just where all the settings as a whole seem to work best. I still don't have the ride that I'm looking for though. I think though, it could be much better... By more face shims, do you mean more 36.15's or heavier .20's, 30's...? What exactly do you think I would need on the LS? As far as piston blow-by...It's a fairly new bike with < 20 hours total run time. When I rebuild the shock last month for the first time after only < 10 or so hours, the oil still looked relatively clean with the exception of break-in wear trash. There was no observable scarring of the piston band or the shock body anywhere as far as I could tell. And I call myself looking really good too.
  13. slodog

    Unsettling Rear...

    Yeah, but the problem with opening the rebound adjuster all the way is that it directly lessens the compression damping too...unless using a rebound separator, right? What rear stack would you think best given my size? I ride just about everywhere...probably 50/50 desert and MX track. I prefer a MX setting and simply deal with the roughness offroad. I also really like a GNCC setup that I've ridden before on a 250F and it was golden!
  14. slodog

    Unsettling Rear...

    ^Mog do you think this rebound stack is correct for my spring? And does the spring seem correct for my weight of 225#?
  15. slodog

    Unsettling Rear...

    UPDATE: The bike must have been just simply out of balance...I revalved the forks by adding more aggressive mid valving, less rebound damping, and a smaller BV clamp (16.25 to 16.10,14.25). This leveled the bike very well with the rear clickers @ 10LSC/12R and the forks at 8C/11R for the best overall ride. I think the front turns near perfect with the fork rebound @12, but the compromise is that this also makes the forks feel too busy (twitchy) in the faster chop or high speed whoops and the rear starts swapping more. I'm thinking about adding a few face shims to the fork BV (maybe 1-3) or perhaps stiffening the entire stack by increasing the clamp back one size bigger. Also thinking of valving the fork rebound one step faster (20 to 18 before crossover). I think the MV is almost perfect, but I could be totally wrong. Any thoughts or suggestion where I should go from here...? Also tried adjusting the shock and moving the clickers away from C10/R12 made things worse and too confusing...
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