I've just sold my 650 'strom after an enjoyable 2+ yrs. They are brill bike with lots of positives but also a few annoying niggles, some of which are easily rectified.
I found the stock seat, seating position and headlight brilliant, brilliant fuel economy & tank range - I deliberately ran it out once at 325 miles to 20ltr, albeit fairly gentle riding although they do drink a bit when the speed goes up, work on 70mpg pootling about, 63mpg was typical, 55 when tramping on.
Performance is again superb - I was never found wanting, even when playing out with the boys, I reckon on a par with my Vara 1k albeit without the torque/kick up the arse grunt that you get with bigger bikes, a nice tractable engine but just a tad on/off when slow filtering (compared to a nice carb'd bike).
General diy maintenance/access was pretty good, especially for a more modern bike, with a pleasant bit of storage under the seat.
Stock, I found a bit of buzziness as you say, dunno why but after fitting a 16t front sprocket to raise the gearing, never noticed it & theres plenty of performance to pull the higher gearing (which incidentally makes the speedo read correct but mpg & odo will read low).
The clocks were again brill, a nice clear, easily understood display with enough real world info (without being over cluttered).
Build and finish was good & on a par with recent Honda's (IMHO) with a few of Suzuki's penny pinching howlers thrown in.....
There are a bunch of multi connectors above the rad that are open to the elements & not waterproof or protected in any way.... easily treated with a bit of spray grease & a bit of foam stuffed above the rad to keep the weather out but are the source of many electrical issues as the bikes age/get commuted etc, a few other connectors can also weather prematurely., the wheel bearings don't have seals on the inner side, moisture can find it's way in leading to premature failure.
Neither of these are biggies, and easily rectified - if you know about it/care!
I struggled getting a suitable screen which became an annoyance over time as I seem to do more & more motorway miles....
Ride and handling...
Generally ok, the forks are a bit soft/basic yet at the same time seem quite harsh & they do tend to transmit every little lump & ripple, moreso once away from the oe fitment tyres.
Handling is generally ok, with the occasional tendency to give the odd squirm, understeer or run wide a bit particularly when pressing on.
A fork brace does help.
If it wasn't for the turbulence/windnoise and ride quality which over time became more and more of an issue (as I'd become 'tuned' into it) I may have kept it (but ultimately other personal circumstances dictated a step down the biking ladder).
There have been 2 recent (wordwide) recalls, a replacement stator & valve clearance check as a tiny number of bikes had contamination at the factory leading to possible cam/bucket wear - good on Suzuki, it must have cost them a fortune!
Some of the service intervals are archaic (7.5k miles to change iridium plugs, 3750 oil change (albeit doubled on later models))
Mine was a 12-16 model, so not sure how much is relevant to the new model.
A great all round bike and brilliant value (around 4k should get you a little used 'as new' one) but with just a bit more effort/development from Suzuki , they could be absolutely fantastic.
Albeit a bit 'white goods' & lack a bit of character, which is not helped (IMHO) by the overly muted exhaust note.
Phil
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