Author Topic: vintage ktm  (Read 20947 times)

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mirageags

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vintage ktm
« on: January 28, 2010, 11:33:16 pm »
well i finally got to figuring out just what my vintage ktm really is, by talking to people on thumpertalk, looking over vin numbers on the frame and pictures of old ktms, and have found that it is a 1983 250 MXC, a 6 speed 2 stroke. I have had it since i was 12 (which is now 17 years ago) and it was my first bike. here is a picture i got around to scanning, from the mid 90s.


 i also found it interesting that the KTM 495, this bikes older brother, was the fastest dirtbike ever produced, clocking in at 123 mph. id really like to find out how many of these 83 mxc models still exist,a nd what the specs are. it certainly makes me appreciate it that much more (even if its  red bunkmate gets most of the attention)
« Last Edit: January 29, 2010, 08:54:54 am by ajd187 »
2017 KTM 250 EXC-F
1983 KTM 250 MXC
2005 Yamaha TTR 125L
2009 Suzuki Boulevard M50 (vz800)
2008 Honda TRX250EX ( wifes)
1988 yamaha razz 50 scooter

zwazuski

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Re: vintage ktm
« Reply #1 on: January 29, 2010, 08:26:34 am »
Wow that is really cool having your first bike. I bet its worth alot more then what you bought it for.

ajd187

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Re: vintage ktm
« Reply #2 on: January 29, 2010, 08:56:11 am »
That is sweet.   There is something to be said for those bikes with their simple construction (air cooled motor, steel frame with easy access to stuff).   You could do a top end job without taking off the gas tank.
2007 KTM 200 XC-W #59

Scooter

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Re: vintage ktm
« Reply #3 on: January 29, 2010, 06:11:56 pm »
Wish I still had my first quad.  Way cool you still own that bike, You should put that baby on a podium and display it in the living room!
450s RULE!

redrider911

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Re: vintage ktm
« Reply #4 on: January 29, 2010, 07:07:11 pm »
That thing looks comfy! That would look awesome restored in my living room.
"I swear, some chicks around here look like they fell face first into a tackle box on their way to or from the IHOP."
- Trail Ryder

mirageags

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Re: vintage ktm
« Reply #5 on: January 30, 2010, 02:18:11 am »
Wow that is really cool having your first bike. I bet its worth alot more then what you bought it for.
its funny you say that becuase i bought it for 125 dollars not running, found it was the ignition coil was burned out so i swapped it out and the sucker fired right up. now the price guides say one in even fair condition is worth 1600 and climbing. not that i would ever sell it, too sentimental.  i know its hard to find parts for. maybe someday i can hand it down to my grandkids or something.
« Last Edit: January 30, 2010, 02:21:43 am by mirageags »
2017 KTM 250 EXC-F
1983 KTM 250 MXC
2005 Yamaha TTR 125L
2009 Suzuki Boulevard M50 (vz800)
2008 Honda TRX250EX ( wifes)
1988 yamaha razz 50 scooter

ehop11

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Re: vintage ktm
« Reply #6 on: September 18, 2010, 08:00:04 pm »
i have the spec and rebuild on this bike edwinhopkins0@gmail.com and I would like to share a photo of mine.

mirageags

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Re: vintage ktm
« Reply #7 on: September 18, 2010, 10:26:00 pm »
really? this sounds extremely interesting to me. you can post photos here but i believe they must be hosted someplace else, (photobucket would be a good place) but you can email me pictures and any info at ags72@yahoo.com. id be very interested in seeing it as there are very few of these bikes left nowaday.
2017 KTM 250 EXC-F
1983 KTM 250 MXC
2005 Yamaha TTR 125L
2009 Suzuki Boulevard M50 (vz800)
2008 Honda TRX250EX ( wifes)
1988 yamaha razz 50 scooter

mirageags

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Re: vintage ktm
« Reply #8 on: April 28, 2014, 05:34:24 pm »
Old thread. Buying a original in box piston kit for this on ebay tonight. Measured cyl bore and original damaged piston and everything is stock and in spec. Cyl needs a light honing as it is in good shape. Crank is rebuilt, going to try bolting it all together in mid may when i get off these crazy hours. If it runs fine the rest of the bike will follow over summer (tires, fork seals, chain sprockets cables packing ect) should be ready by end of summer i hope.
« Last Edit: April 28, 2014, 05:36:18 pm by mirageags »
2017 KTM 250 EXC-F
1983 KTM 250 MXC
2005 Yamaha TTR 125L
2009 Suzuki Boulevard M50 (vz800)
2008 Honda TRX250EX ( wifes)
1988 yamaha razz 50 scooter

ajd187

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Re: vintage ktm
« Reply #9 on: April 29, 2014, 08:50:21 am »
Old thread. Buying a original in box piston kit for this on ebay tonight. Measured cyl bore and original damaged piston and everything is stock and in spec. Cyl needs a light honing as it is in good shape. Crank is rebuilt, going to try bolting it all together in mid may when i get off these crazy hours. If it runs fine the rest of the bike will follow over summer (tires, fork seals, chain sprockets cables packing ect) should be ready by end of summer i hope.

That would be cool.  VINTAGE RACE.

Plus I've been hearing about this thing getting re-assembled for like 4 years now. LOL. 
2007 KTM 200 XC-W #59

mirageags

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Re: vintage ktm
« Reply #10 on: April 29, 2014, 10:11:25 am »
Cylinder tolerance is .060, right now i have .050. The piston that was ruined was the stock piston from the markings on it. Not bad for around 400 hours or more and previously raced by a woods A rider. My father is giving it a very super light honing this morning. If i ever have to do a top end again its going to need to be a bigger piston. Im mostly concerned about getting the bottom end put together correctly.
2017 KTM 250 EXC-F
1983 KTM 250 MXC
2005 Yamaha TTR 125L
2009 Suzuki Boulevard M50 (vz800)
2008 Honda TRX250EX ( wifes)
1988 yamaha razz 50 scooter

mirageags

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Re: vintage ktm
« Reply #11 on: May 05, 2014, 09:36:16 am »
Yeah so the piston i got in the mail is 10mm shorter top to bottom than my original. Most of it seems the same besides the wrist pin is also at a different hieght. Goddamn it. Its all the same markings besides the old one says 71p7 and this says 71p9. I went back and forth with the seller multiple times and he said this was the one
2017 KTM 250 EXC-F
1983 KTM 250 MXC
2005 Yamaha TTR 125L
2009 Suzuki Boulevard M50 (vz800)
2008 Honda TRX250EX ( wifes)
1988 yamaha razz 50 scooter

Brenden

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Re: vintage ktm
« Reply #12 on: May 06, 2014, 09:42:02 pm »
the top of the piston to the wrist pin is the most important dimension.  Put the wrist pin in both pistons so that they line up and see it the piston tops are flush with eachother.

mirageags

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Re: vintage ktm
« Reply #13 on: May 07, 2014, 02:12:45 am »
It ended up being a piston for the water cooled version that year. In 1983 mid year they changed from air cooled to water cooled, also from port style piston to one that uses the rubber intake manifolds and reeds. As usual par for me, i end up having a "special" version that was early for 1983. My frane says 83 but the cylinder is stamped late 1982 with a time mark thing. So my piston looks like the taller 71mm port piston style, without the port. I have been unable to find even a picture of that one, they all have the port slot.
Its been a pain in my ass. I have one or two more places to check but i may have to clean up the 400 hour original and run it. It is a forged mahle at least, and not cast. Barely in spec, but it is what it is. Also discovered it has the rare fox double clicker shock that some models had.
I will find a place to host a picture and show the difference between the two pistons
« Last Edit: May 07, 2014, 02:22:03 am by mirageags »
2017 KTM 250 EXC-F
1983 KTM 250 MXC
2005 Yamaha TTR 125L
2009 Suzuki Boulevard M50 (vz800)
2008 Honda TRX250EX ( wifes)
1988 yamaha razz 50 scooter

mirageags

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Re: vintage ktm
« Reply #14 on: May 07, 2014, 02:40:01 am »
Mine is on the left. Pic of the cylinder also.




« Last Edit: May 07, 2014, 02:42:20 am by mirageags »
2017 KTM 250 EXC-F
1983 KTM 250 MXC
2005 Yamaha TTR 125L
2009 Suzuki Boulevard M50 (vz800)
2008 Honda TRX250EX ( wifes)
1988 yamaha razz 50 scooter