Hey, really thanks for your long post about this bike. The KMX, MTX, TS125R DT125R etc etc are all pretty similar in spec and performance, so which you get makes little odds really, but a nice example of any will still be a good fun bike! Lastly buy on condition, and not the model. New bearings and seals to re-build the rear end are over £120. Avoid anything that's been used as a field bike and has no electrics fitted unless you want a lot of work.Īlso expect any hard used example to have worn out suspension by now, the rear shock on many will be scrap, and the Uni track linkage bearings wear out and seize on neglected bikes. A lot of KMX's and DT125R's etc will have been, and making sure you have the correct frame number's, log book and keys is very important.Īfter that it comes down to condition and how it's been looked after, along with how nice you want it cosmetically? Any tatty bike will cost a lot more to make look smart, than buying a tidy one with clean not scuffed and matched panels etc. The only really important thing to check when buying one, is to make sure it's a legit bike and has not been stolen. Performance wise the bike was tested at 0-400m in I'd expect the 0-100kmh time to be around 8seconds in 18KW form. Project bikes should cost £400-1000 maximum, and a tidy one £200-400 more maybe. Good KMX's are maybe starting to go up in price, as 2stroke 125's are getting a bit rare these days and a nice one is hard to find now. Like the DT125R thousands of KMX's were sold over a span of 16-20years, so second hand parts are never far away on Ebay etc. Part availability is good mechanically, but plastics and cosmetic parts are getting harder to find, and new bits are expensive. If it does fail, it's usually snapped spindles on the valves themselves, but failure won't cause engine damage like the Suzuki ATEC system. The KIPS powervalve is generally reliable, but can fail if it gets too gunged up with carbon. The sidestand cut out switch can play up, but it can be removed easily. There's not many common faults or problems specific to KMX's, but things like checking the alloy wheel rims for corrosion is important. You'd be lucky to get more than 45mpg at best. It's not really up to being blasted around MX tracks, the KDX125 would be better for more serious off road use, or a KTM, or Husqvarna enduro derived bike.Ĥ0mpg is about the average fuel consumption. The suspension on the later ones has a damping adjustment on the rear shock, and the std suspension is ok for trail riding, or playing around in woods or fields.
Top speed on std gearing is 80mph, but if used on the road only a 15t front sprocket is a good mod to drop the revs and gain 4-5mph top speed, and make the gears a touch longer too. De-restriction is a simple process compared to 20003> DT125R's etc. Restricted power is 9KW, and un-restricted is 18KW. I'd be expecting the motor to go around 10-15'000miles between top end re-builds depending on how you treat it. The KMX is a fairly robust reliable bike, with a decent engine that is not too demanding of maintenance, and is similar to the other Japanese 125's in that respect. Also if you want a clean tidy bike with good plastics and cosmetics, get the best you can find, as replacement plastics/panels are often expensive and hard to find for 2stroke 125's that have been out of production 10years or more. My first advice with buying any 125cc trail bike is buy on condition not model. They would really not be much different on the road to even an Aprilia RX125 or Husqvarna WRE125, but newer more competition orientated bikes like these are better off road with a stronger chassis, better quality longer travel suspension etc. They are a comparable 125cc 2stroke trail bike with the likes of the excellent DT125R and the rare Suzuki TS125R. I WILL BE VERY GRATEFUL.įirstly the newest KMX125's are from 2002, maybe a few sold into 2003. What about electronic, didn't broke? Have any power valve like dt or some kinda tricks? Hard to get body or engine parts? Is it expensive? Fast in (0-100km/h?) How much in s don't know? What to watch when you buy this bike?
Also I'm searching service or repair manual (service better). What about suspension? Good for off road ant travelling? What about fuel consumption? It's enough powerful to ride in offroad? Have problems, that most kmx have? I think you get it what I want, thanks for answers. What are you thinking about him? Do it broke a lot? What about power in kw? How much in restricted? How much kw do you get if you de-restricted? Broke often when de-restricted? What about his top speed when it is in restricted mode and when it is de-restricted.