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  1. Hi there Guys, Looking to get into the nitty gritty with the suspension on my 2004 VFR800. I mostly ride on the street (rough Canadian roads) with 1 -2 track days a year. Due to my size and weight (5'8" and 135lbs) I find that the bike is actually over-sprung in the rear and takes alot of commanding to turn at low speeds. I also wanted to add some more adjustability to the front forks as they seem under valved( harsh) So far I have purchased a set of F4 or F4i forks (cannot tell due to being very similar but could be .66kg or .77 kg springs) along with a very good condition set of 4 pot calipers. These will need to be re-sprung! but I'm unsure as the best way to do the calculations for the increase, (race-tech shows vfr800 with my weight should be .86 kg springs, but when using vfr weight on the CBR600F4i calculator it recommends .95 kg springs( seems too stiff) If the .86 is the correct calculation is it possible to use the VFR800 springs in the F4 forks? (using the preload spacer to accommodate for slight length variations) Also Any recommendations about Valves? Racetech? Ohlins? DIY??( I have herd of polishing the pistons and making your own stacks but dont know the science) I would also contemplate sending the valves to DM for upgrade( forks are currently disassembled) My next questions relate to the rear shock, My expectations is that the F4i rear shock will also be the replacement for the VFR stocker. Are there any higher performance shocks that could be fitted the the VFR? 600RR 1000RR GSXR1000? or do all these newer designs have fitment issues? If i am to use the F4 rear shock as the best inexpensive starting point Again what is the best way to calculate spring rate, some results from Racetech show the stock 14.3 kg unit as acceptable for my weight, other times it says its too much????? Once a spring is chosen, what should be done for valves? Racetech?, diy?, send to DM? Open to any suggestions or ideas to improve the ride and performance! Thanks in Advanced!
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