I recently modified my son Joe's bike with the Race Tech emulators, adaptors and fork springs.
Race Tech part number for 40mm Husqvarna forks is FEGV 3801 and adapter part number is
FPEV AD3805P.
Adapters are only $19.95 for the pair, so I thought that was cheap enough to go ahead and buy them.
Race Tech can provide Eibach springs for your 87. Use the
www.RaceTech.com spring calculator to select spring rate for your weight.
Race Tech suggested this set up for 210 lb rider: emulators with the blue spring set at 2 turns of preload, .48 kg springs with 10mm preload, 15 wt fork oil, oil level set 120mm from the top, with springs out and forks collapsed.
These forks came off an 84 250 WR and are mounted on a 79 390CR.
I drilled out the damping rods as specified by Race Tech. Which meant drilling through the 2 existing holes with a 5/16" bit. Drill through 1 existing hole and straight through. Then turn the rod 90 deg and locate the center between the 2 sets of holes previously drilled and drill another pair straight through for a total of (6 x 5/16") holes.
Obviously, deburr and clean throughly before reassembly.
Unfortunetly we won't be have a chance to ride the bike with the new Race Tech set up until next weekend, but I'll definately let you guys know how it works or what adjustments we had to make.
Ron
Update: My sons 1979 Husqvarna 390CR with 40mm WR250 forks and Race Tech springs and emulators.
For a 210lb ride,r Race Tech advised using 15 wt fork oil 120mm from the top, with 1-1/2 turns on the blue springs, in the emulators.
That set-up was horrible! The front end would dive about 6" inches into the travel way to quick and make the front end ride to low. That made the rear end loose bucking and kicking up all over the place.
He liked the stock forks way better. When I asked him what was wrong, he said "I don't know, I just don't like it".
I talked about it with Steve the Huskydoggg and he suggested since my son is a pretty big guy, we should start at 4-1/2 turns and raise the oil level to 100mm.
What a huge difference. Now the front wheel follows the ground really well and the rear end is back to working properly.
He flat landed 4th gear jump from about 7 ft in the air and used all but about 1" inch of travel. Very plush landing.
I don't know what could be done to make it any better. I highly recomended this set-up.
Can't wait to get my 77 250CR done, it will have the Race Tech set-up too.
Ron