Converting a ktm 525 to 450

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    Converting a ktm 525 to 450

    Long time lurker, first time poster

    I bought a very clean plated 525 from a friend, but its more bike than i want, runs hotter, etc. Ive read that its just a different bore on the engine - can I change it from a 525 to a 450 with just a cylinder and piston swap?

    Thnx

    #2
    I have nothing to add except anytime the topic of dirt bikes is brought up it makes me miss the days when 2 strokes ruled. I know modern fourstrokes are supposed to be all bad ass but nothing will dump you on your ass faster than an ill timed powerband explosion of a temperamental 2 stroke.

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      #3
      Seems like you'd be better off swapping the entire bike. Like you can't get people interested in swapping their 450 for a 525?

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        #4
        Not swapping. It is barely used, like new, with upgrades. It has to stay "in the family"

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          #5
          Fit an inlet restrictor of if it's efi get it mapped for less power.

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            #6
            What year KTM?

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              #7
              07 I believe, last year of rfs

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                #8
                Yes a piston and cylinder should do it you may need a new head also bottom end is the same though. You will also need to re jet the carb.

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                  #9
                  Originally posted by Animalmother View Post
                  I have nothing to add except anytime the topic of dirt bikes is brought up it makes me miss the days when 2 strokes ruled. I know modern fourstrokes are supposed to be all bad ass but nothing will dump you on your ass faster than an ill timed powerband explosion of a temperamental 2 stroke.
                  2 strokes have been making a large comeback, mostly on trail bikes despite the (very) old stigma.

                  ​​​​​​I recently rode an efi 300 ktm, holy fawk, what a badass bike. Incredible lug ability, but crazy (60+?) hp on tap. Plus because it's efi it's got separate oil and fuel tank. Can borrow straight fuel from buddies on long rides, or pull up to a gas pump. Oil is supposed to last 3-5 tanks of fuel iirc.

                  My father in law has a 525 and newer efi 500. Both are a handful anywhere but wide open areas. Maybe try to have the carb tuned to run a little more rich to cool it down? Not a carb guy

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                    #10
                    yeah this 525 is too much. if i cant get it down to a 450, then i will convert it to supermoto. I dont want this much power on tight trails

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                      #11
                      dont go effing up a nice bike for LESS power!


                      my kids bikes have an adjustable throttle stop, go that route..... if a riding buddy went this route i would endlessly fuck with it though.




                      really i cant get my head around the concept of too much power. maybe figure out a progressive spring in the throttle making it harder to hit WOT



                      shit one more thing- if you go with less power for the purpose of supermoto, as soon as it is supermoto'd then you will want the power back, or more top end... so maytbe just screw withthte gearing

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                        #12
                        you missed it, if supermoto then stay 525, 450 for dirt

                        it is better to ride a slow bike fast, than a fast bike slow

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                          #13
                          Perhaps switch up the gearing a little bit?

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                            #14
                            This is like removing a testicle to lower your sperm count.

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                              #15
                              Originally posted by YotaAtieToo View Post

                              ​​​​​​I recently rode an efi 300 ktm, holy fawk, what a badass bike. Incredible lug ability, but crazy (60+?) hp on tap. Plus because it's efi it's got separate oil and fuel tank. Can borrow straight fuel from buddies on long rides, or pull up to a gas pump. Oil is supposed to last 3-5 tanks of fuel
                              They are nowhere near 60HP. My old KX was 62 at the rear tire. It felt like it was going to kill you. This has none of that feeling. It also has issues staying on the fucking kickstand.

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