Join Date: Oct 2007
Location: Daytona Beach, Fl.
Just Installed Progressive Suspension
After 25,000 miles my back was getting beatup. So after reasurch decited to upgrade. after talking with Progressive they reccommended 412-4207c Hds & stock dropin forks springs. total cost from JC Motors $275.00 with free shipping, Fork oil not cheep $16.00. I'm 6'5" and with full dress weight about 250lbs have about 50 lbs of accessories. 4" droped floorboards plus custom seat 4" inches higher, therefore I wantedto keep the stock height. Rear install a piece a cake Set the preload on 3. Tanks To Knifemaker it gave me a sage of 1/2inch. The forks were simple to dropin. I cut the stock spacer to exactly 7".used a mitersaw with a well lubed plywood blade ( tablesaw works well to,filed the burs ready to go. since fork seals were OK, I drained the fork oil, Did not remove forks from bike. just used a jack to lift the front, pumped a few times by keeping one hand on top of the tripple tree and one on the tire rim and pumped. I let the oil drain overnight.Now for the Fork oil, Progressive recommeded 10W. I measured the oil that came out 12+ oz. Shop manaual states on oil change volume should be between 10.48-10.82oz. Also note I cleaned the forks cyclinders with Brakekleen and compressed air. Now for the fill. I wanted a 9" oil level, first put in 101/2 oz way low Added 1 more oz still low Finally to get to 9" it took 12 3/4 oz. So much for manuals. Used a narrow tape measure to get to 9" safe range(according to manual is 8.65-9.45inches
Thanks to the many forum treats that show and tell how to do this it's not that hard.
Now for the test ride
WOW!!! what a difference, smooth. I put on 50 miles on secondary roads. On smooth pavement bike road very smooth no bumpy back seat. took in on a ruff road sill very smooth. I noticed to front forks a little stiff ( maybe to much oil) I will put on a few hundred miles before I fine tune