thx1139

check the Mother Of All Viscosity Charts found on this informative Website

I've got some valves that look similar. Came in a set of junk FleaBay cartridges. Anyone have a copy of the setup instructions?

Yep. but I think they are bigger dia. than 41mm. Gen6 chopper anyone?

Nice idea, but, the tubes are too short! :blush: damn! even longer than a gen5? :fing02: :fing02: sooo... anyone got leftovers from their frankenforked Valkyrie?

If you had a 41mm cartridge fork, you could just swap the 1000r sliders onto it an call it a day. Anybody with the USD front end on a 5th gen looking to get rid of their leftovers?

A volume specification would seem to be less affected by spring position. If you go by oil height, that number should be different if the springs are then reversed. With tight coils at the top, more of the measured air gap is occupied by the incompressible metal of the spring. That shoud have the same effect as a higher oil height.

You will also find the very same 3-port compression valves in any new 600rr or CBR1000 USD fork. Anyone wants to drop their leftover 3 ports in an envelope and send them to me I will happily pay for the postage. :dry:

Again, there's another economics situation. Stock Showa 3-port valves are a high flow valve, probably no worse than a Gold Valve. However after an individual buys all the shims to make a couple C34 stacks, they've spent the cost of a GV kit anyway. Different story for someone like Phil who buys his shims by the boxload.

Economics. bent F4 parts fork = $35 allegedly straight eBay F4 fork = $350

That's correct; the parts from rebound-adjustable caps and non-adjustable don't match up. I was implying you might take F4 caps and put them on F3 damper rods to get them into a 43mm tube. I know, next question: "why the hell would I want to scrounge two different sets of broken forks when 43mm F4 guts should be all I need for a gen6..." However; IIRC the F4 damper rods are even shorter than F3, and that might mean cutting down the fork travel a little more than one is prepared to sacrifice. Ducati, Triumph, Harley, Suzuki, Kawasaki, all used Showa 20mm carts at one time or another and right up into 2009. If a person had the skill, a small lathe and knew what to scavenge, they could build some pretty trick midvalved, aluminum body, 12mm damper rod carts that would literally drop right in to a stock fork. -all from junk! :biggrin:

The only difference diameter-wise between 41 and 43mm cartridges is the outer part of the fork cap. You could screw F3 guts into a 43mm tube by changing out that one piece. [and conversely, F4 guts in a 41mm tube.] One important detail that hasn't been mentioned is the different lengths of the rebound rods, and the respective extended lengths of their cartridges. Notice the F3 rods are shorter, but the top-out springs are located further up on the cartridge bodies. There's potential for trouble here. When assembling a hybrid fork, carefully check that it is topping-out correctly against that spring when extended; otherwise there is nothing preventing the end of the rebound from damaging the bearing in the top of the cartridge at full droop.