Maintenance & Technical > KX450F / KX250F
KX450F vs. KX500
stewart:
the only reason the 4 poke is the future is we have let the epa control us,,2 stokes dont drop valves ,,break valve springs or lose cam lobes..topend job 150.00 2stroke///1500.00 4 stroke ..feeding 4 stroke riders roost pricesless
KXcam22:
Actually, in a race 2-strokes probably burn less oil too. Cam.
dans89kx500:
Thanks for the reply's. So IYHO would you just buy a new 250 stroke over a 450? The problem is, only KTM still builds an open class two stroke (300cc). Boiling over a 4 stroke or drops valves sound a bit scary. I'm 37 and have never owned a 4 stroke or ridden a newer model. Im also still not sold on buying one.
Thanks,
Dan in Vacaville
KXcam22:
The KTM 300 is a nice bike, best bottom end power I have found compared to the KX500. New YZ250 looks nice too. With my new 4-stroke I am not worried in the least about valves and other issues. I single track ride so the bike will not spend extended time at high RPM, only short blasts while I get my jollies. I am also a maintenance nut, love synthetic oil and clean my air filter lots so I am expecting at leat 100 hours between valve changes. I put a rad catch tank on and will probably try some better coolant so temp should not be an issue either. Bought a 15oz FWW on ebay to cure the lowspeed stalling thing. Transfered my poor-mans enduro computer. Put on a full compliment of fork, rad guards and skidplate, shark fin in the making. All I need to get is a larger gas tank and then the new 4-stroke should be as close to equivalent to my KX500 as can be. Time will tell how it works out for me. I do know that riding the bike is like magic, ergos, handling, traction, and just about everything together make you feel like a super-hero on wheels! Cam.
SMPKX500:
I don't understand how the EPA has regulated us to four strokes? Why not a two-stroke with direct injection? Fuel injection? And possibly other technologies to release less hydrocarbons. We have the technology we can rebuild him. 8-)
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