It's been done before, but no seems to have ever documented it. Seeing as I am doing it now here's my experience, with pics even. The DRZ 250 uses 43mm Cartridge forks with adjustable damping and rebound that outwardly look very similar to the DR650's Damper rod units, so I purchased a pair taken from an '02 model DRZ 250 off Trade Me (our local version of Ebay). As these share the 43mm measurement with the DR 650 the 250 forks slide straight into the DR650 clamps and in fact use the same axle, spacer, speedo drive and caliper as the 650. The one main difference is that the DRZ250 uses a 250mm disc and the DR650 290mm, plus the disc offset is approx 1-2mm different. This means you need either the 250 wheel and disc or to get an adapter bracket made up which spaces the caliper out 20mm and makes up for the extra 1-2mm offset to take the 650 wheel and disc. I decided to go this route because: Ease of fitment: The 250 forks are the same size as the 650 forks though are a little longer so as already mentioned they slot straight into the stock 650 clamps/wheel etc. Being that they are the same size they are obviously up to the job structurally. The 250 springs do need changing to suit the heavier weight but the stock 650 springs aren't up to the job either so that is something that needed to be done anyway. More than likely you'd need to respring any other forks you got, for example the RM-Z 450 weighs ~112kg vrs the ~147 of the DR650 (both dry) so the 450 forks would be further out than the 250 ones. Cost and availability: You only need the 250 fork legs and a caliper bracket. In NZ this is a far cheaper option than buying say a complete DRZ-400 front end including wheel, disc, clamps, headlight mounting brackets etc etc, or buying a complete front end off something not Suzuki and having to make all sorts of steering head adapters, pressing out stems, making new ignition barrel and speedo brackets or whatever to make it fit. Suzuki 450 front ends rarely come up for sale here and when they do sellers want their weight in gold for them. Impact on future mods: I'm intending to do an outback Australia trip on this bike next year for which I'm intending to fit a Safari 30 ltr tank to cope with the huge distances involved. If you go much wider than the stock clamps you can get steering lock issues where the clamps hit the Safari tank. So you can loose some maneuverability at full lock, and potentially have to remake your steering stops to stop the safari tank being damaged in a crash.