Maintenance & Technical > KX500 Original

Kx500 motor in a streetbike chassis?

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PaulBWatertownCT:
(reposted from introductions area in hopes of a reply)

Hi all,
I have had many, many bikes over the past 25 years but have always had the itch for a 2 stroke streetbike. I am considering buying a KX500 and transplanting the engine into a 2008/2009 Ninja 250R. I have been doing some extensive research and believe the motor will easily fit into the 250R frame with some custom motor mounts for the front of the engine. Some larger rubber and steel braided lines would be my only other mods.

I would appreciate any feedback on thoughts regarding driveability, vibration, or other thoughts and ideas. My purpose is to have some fun and ride something fast, different, and a complete sleeper. I figure I can buy a new or almost new 2008 Ninja 250r for about $3500 and I have seen some excellent condition 2000 or newer KX500s for around $2500. For $6000 plus some garage time and a custom pipe, it sounds like a solid plan.

My current bikes include: 2005 KTM 300 MXC, 2002 KTM 200 MXC, 2002 Aprilia 1000.

Past bikes are too numerous to list but started with a 1975 Yamaha GT80 and run through 2007 Ducati S2R1000. Favorites include 1986 GSXR1100, 1996 TL1000s, 1993 GTS1000, 1997 CBR1100xx.

Let me know your thoughts (and I do know it would be cheaper and less hastle to buy a new supersport bike but that's not the point).

Thanks,
Paul B.

Polar-Bus:
Sounds like a cool project, I am thinking your only nagging issue to combat will be excessive vibration....

KX500 vibrate quite a bit. When I ride my 500 on hard surfaced logging roads for extended periods of time my feet start to tingle fron footpeg vibration.

jfabmotorsports.com:

--- Quote from: Polar-Bus on April 19, 2009, 10:46:58 PM --- KX500 vibrate quite a bit. When I ride my 500 on hard surfaced logging roads for extended periods of time my feet start to tingle fron footpeg vibration.

--- End quote ---

Look on the brite side....It can't vibrate more than a Harley. I also had a Suzuki Intruder, an '86, that you had to reach up and touch the mirror if you wanted to see behind you. Besides Chiks dig it!    :evil:

gwcrim:
I've put a lot of miles on a Sportster and THEY vibrate.  There is a big difference between the vibrations though.  The Sportster is more mellow.  The KX500 is MUCH more buzzy.  Change the chassis though and who knows.............???

I think you're idea is wicked.  I wish I had the fabrication equipment to build something like that.  I'd love to put an RZ350 engine in a 250 Ninja chassis.

KXcam22:
Paul,
  You might be happier with a RZ350 or TZ250 frame.  They are both stiffer, handle better and will handle the wheelie shock better than the ninza 250, which is not really a bike designed to house serious hp and handle cornering G's.  I saw a pic once on a KX500 engine in a 250 apprillia frame.  Very nice.  You can get rid of much of the vibratio with some crank truing - a must for the street.  Fun project. Plan ahead on a hidden frame mounted reservoir tank to hold 2cycle oil. An old injection oil tank or rad overflow tank from another bike works well. Cam.

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