I had a 2000 DS650 with FMF PowerCore4 exhaust & K&N filter and it was a fun quad but i liked my KFX700 better (had both at the same time). The DS650's do have a LOT of low-end torque and have probably one of the best rides in stock form of any quad out there. The 2000 model is also one of the widest & longest. I think in 2002 they made the swingarm 1" shorter and made the overall width about 2" narrower. That 2000 model with the stock axle is 50" wide to the outsides of the rear tires. Very stable but not so good for tight trails.
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'04 KFX730
Fundy 11.1:1 Pistons, FST Stage 2 cams, Ceramic-coated Muzzy Exhaust, +4 Swingarm Extension, 12-Hole Mod, UPP Cross-over Intakes, 3/32" drilled main jets, #42 pilots, 3 shims/needle, Elka Front Shocks, Revalved Rear Shock w/ Road Magnet Spring, CCP Steering Stabilizer, TrailTech X-bars/Clamp, Pro-Armor nerfs--bumper--grab bar, 25x12-10 10-paddle Extremes on 10x11 wheels, VFJ #6 Clutch Spring w/ 2 shims... BOSS NOSS 30-shot
'04 KFX700
DMC Afterburner Quiet4 Dual Exhaust, 12-hole Airbox Mod, Crossover Intakes, #45 drilled main jets, shimmed needles, 6* Timing Advance Key, Spark Plug Boot Mod, Road Magnet Suspension Springs, 24x11-10 8-paddle Skat-Trak Extremes on 10x10 wheels, EPI Pink Spring

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