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      JUST IN!   04/24/2018

      HOW TO: 4-STROKE PISTON REPLACEMENT DONE RIGHT!

T-Bear

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About T-Bear

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  1. I have a friend that works at RCS. They had a problem with springs rubbing, then they reworked them, thats when they started breaking. RC's broken spring was a reworked spring. Any new springs they have made since then have been progressive. The material is not the problem
  2. Your best bet is an OEM Ti Spring. RCS had some manufacturing flaws that were never fixed, causing springs to break. They are still trying to sell the blem springs.
  3. The problem is heat, the stock springs can''t take the heat generated when the clutch is working good. I worked on the Dark Synergy springs in the development stage and they are made out of a high temp material and they are finished different than most other springs to make them hold up better at high temps. They will work in the 150R with a 190 lbs. rider. I have been told that Honda tries to allow a little slip in the 85 and 125, this friction will boil the oil, it is that hot!
  4. I love this stuff, the cheep aftermarket springs sack out because they use the same low temp steel the OEMs use, they just make them stiffer so that you have a little safety margin when they heat set. The Tokyo Mod springs are good. Very few of the people you buy the springs from know anything about springs, and very few spring companies know anything about motorcycles. Tokyo Mods gets theirs from a good source, wink wink. Many of the aftermarket companies start by buying OEM springs and copy them dimentionally but with a 10, 15, or 20% stiffer rate. Look for springs that use a high temp material, proper installed pressure- not too soft or stiff, and a low spring rate. I have worked on projects like this for teams H, K, & Y.
  5. The problem with running clutch springs that are not designed for the specific model is that they will have a different stack height, or coil bind height. I know the Dark Synergy springs are designed to stack up at the same or lower height than the stock springs. I have made titanium clutch springs in the past and they are very inconsistent spring to spring, and the only coating that will keep titanium particles out of your oil (DLC coatings) is more expensive than the titanium springs. Also be careful not to run too stiff of a spring, recently I have heard about breaking gears on 06 KXF450s and traction problems on CR125s when the springs are too stiff. Installed pressure and spring rate are not the same thing. Many aftermarket springs are just stiffer so when they loose half of their installed pressure they still won't slip, but you will have arms like Popeye after a season. Look for springs that are made for high tepratures, heat is what kills the spring and when the springs go the clutch goes.
  6. I just talked to Jay in parts at Honda of Tulsa and he was very impressed with the Dark Synergy springs in his CRF race bike. He is getting both hole shots and light lever action.
  7. Dark Synergy can be contacted at 918-230-5684 Most of their stuff is sold to other engine builders who private label their springs.
  8. The Dark synergy springs hold up on a full mod YFZ quad without giving you arm pump. Most of the aftermarket springs just raise the spring rate and installed pressure. The reallity is that they are no more stable than the stock springs.
  9. If your fiber plates look good, then the clutch part of your problem is your clutch springs. Most springs are made of steel that is only good at high stress up to 250 degrees. I have seen 500 on the basket and 1000 on the steel plates. look for springs that use different wire than the stock springs.
  10. You don't have to go stiffer with the clutch springs. All of the OEM springs and 99% of the aftermarket springs use material that was made to operate at 100 degrees lower than the oil in your bike. A very few (Dark Synergy) use high temp wire that does not go away at the 300 to 400 degree range, this allows the use of a lower spring rate and a more stable installed pressure. I used to engineer springs for most of the factory teams.
  11. The current Dark Synergy clutch springs are not titanium. Titanium clutch springs have three problems. 1. they cost five times more than the next most expensive clutch springs. 2. because of the high pitch and acid etch finnish they are very inconsistent spring to spring. 3. you don't want even the smallest titanium particle floating in your oil. It will take out a bearing or seal. Dark Synergy uses a high temp wire that has an operating temp over 200 degrees hotter than the OEM and most aftermarket springs. They are also engineered and tested for each application.
  12. Be careful titanium particles are like diamond dust, very abrasive and will eat seals. That is why you do not see titanium fork springs. Ducati tried them years ago and could not change oil fast enough to keep fork seals. Titanium is a soft metal that holds a very sharp edge. That is why all the other internal titanium components use a DLC coating. Take a good look at a titanium rear suspension spring with a few hours on it, you will notice flat spots between the coils. There are other options.