KTM ID question

[slvrbrdfxr]

Hi All,
My KTM knowledge is limited so I'm looking for a little help with a bike and engine ID. Over the weekend I picked up a basket case dual shock KTM frame # 902 04365 which came with a 125 engine serial # 9 5109639. Is this a 1979 model MC80 125 ?? Since the engine number starts with a 9 would this be the correct 79 model engine as well ?? Bike looks to be in good shape and pretty much all there. Probably will be missing some small odds and ends when I go to reassemble it but time will tell. One thing I know missing for sure is the end cap for the exhaust pipe. Anyone have a good picture of what the pipe end cap should look like ?? Any help would be greatly appreciated. Thanks !!
Dave McCullough

[jj]

Dave,

It could be '79 GS80 enduro model as well. The MC and the GS were similar that year. Does it have a rear frame loop? Is there anything left of the rear fender? Aluminum or steel swingarm? Number plates part of side panels?

John J Slivka

[slvrbrdfxr]

John,
Thanks for the reply. The bike does not have a rear fender loop on the frame. Has a straight style rear fender with no place to mount a taillight. Has an aluminum swingarm and the side panels are missing so no help there. I'd be glad to send you a picure if that would help ID it. Any idea about that serial # engine being a 79 model ?? Thanks !!
Dave McCullough

[Steve Minor]

Does it look like any of the bikes on the site below?

http://web.tiscali.it/ktm70pages/1979.htm

[slvrbrdfxr]

Steve,
Thanks !! My bike looks like the one in the bottom right corner of the first page of that site which has a caption of "KTM 125 MC 79 by Jumper". Would be nice if had a right hand view of the same bike so I could see what the end of the exhaust looks like. Guess that's what mine has to be. How about the engine number ?? Is the engine a 79 also since it starts with a 9 5109639 ?? Let me know what you think. Thanks again !!
Dave McCullough

[Speedy]

quote:Originally posted by slvrbrdfxr

Hi All,
My KTM knowledge is limited so I'm looking for a little help with a bike and engine ID. Over the weekend I picked up a basket case dual shock KTM frame # 902 04365 which came with a 125 engine serial # 9 5109639. Is this a 1979 model MC80 125 ?? Since the engine number starts with a 9 would this be the correct 79 model engine as well ?? Bike looks to be in good shape and pretty much all there. Probably will be missing some small odds and ends when I go to reassemble it but time will tell. One thing I know missing for sure is the end cap for the exhaust pipe. Anyone have a good picture of what the pipe end cap should look like ?? Any help would be greatly appreciated. Thanks !!
Dave McCullough

The frame number indicates that it is a 1979 up to 90607184 after that # it begins with 00607186 for 1980.
Cheers.Speedy-=======>>>>>>>>.

Helmut Clasen KTM
162 Hillcrest Ave
L9H 4Y3
Dundas Ontario Canada
Ph.905-627-5349
[email protected]
http://speedy_c.tripod.com
Sachs MC-GS 250-7A reeds
Hercules 350-7A
Hercules 250-7A
Zuendapp 125 GS
KTM 200 EXC 2003
KTM DUKE 96 Spec.

[slvrbrdfxr]

Speedy,
Thanks !! Does the 9 before the engine number indicate it's a 79 model engine as well ?? Got a couple pictures headed your way also hoping that will help. Thanks again !!
Dave McCullough

[rob w]

Dave,

Yes the 9- beginning in the engine number does mean 1979.

Bob

[rob w]

Dank, Herr Speedy -->>!!
I'm in need of that sort of info.

But 1980 can't begin at 006 can it (??), because I have a 125 with a frame number of 002 13631. I'm taking that as meaning it's a 1980 model, although the previous owner called it 1981 because of it's style of plastic body parts.

Man, this KTM era is more confusing than the 70's with all the constant changes.

So in 1979 did the 400 engine also evolved into an all new 420 engine. ?
Because I have a 420 with the frame number 905 07085, again which I would think of as being a 1979, and the seller called it a 1980.
Who's right? Is it a '79 or '80 420 ?

JJ, help!

Dave, Is the size of the opening at the end of your pipe, just a tad bigger than 2 1/4". If so, I don't have a spare silencer insert, but I can send you a pic of what it looks like.

Thanks everyone,

BobW  

[slvrbrdfxr]

Bob,
Glad to find out the engine is the correct one for the bike. It looked to be correct but I just wasn't sure. This is the bike I sent you a couple of dark pics of several months ago. I finally got the trade done with the seller from CO and have it at the house now. I have some better pics now too if you would like to check it out. I'll have to measure the exhaust silencer opening and get back to you. Thanks again !!
Dave McCullough

[tofriedel]

Rob,

I believe that the 80 model frame numbers started with "0" designating the year and the following 2 digits indicate the month "02" .  In your case it was built in Feb.,1980.

Tony

[Speedy]

quote:Originally posted by tofriedel

Rob,

I believe that the 80 model frame numbers started with "0" designating the year and the following 2 digits indicate the month "02" .  In your case it was built in Feb.,1980.

Tony

Anybody who is interested and sends me his e-mail address can have a KTM Serial number information sheet.

Speedy----------->>>>>>>>>>>

Helmut Clasen KTM
162 Hillcrest Ave
L9H 4Y3
Dundas Ontario Canada
Ph.905-627-5349
[email protected]
http://speedy_c.tripod.com
Sachs MC-GS 250-7A reeds
Hercules 350-7A
Hercules 250-7A
Zuendapp 125 GS
KTM 200 EXC 2003
KTM DUKE 96 Spec.

[Paul Danik]

I just picked up a KTM with serial number 001 09961 and engine number 9  54-23283.  If I have read the posts above correctly this is a 1980 250 that was built in January. What I am also curious about is if the aluminum swingarm is standard?  Also, it is a 6 speed, does that mean that it is the GS model and not the MX, or do both have the 6 speed gearbox?  It has no rear loop so I assumed that it was the MX, but I though that they were possibly just 5 speeds.

Thanks
Paul

[454MRW]

Paul,
It looks like you do have an early 1980 MC 250, if there is no frame loop or lighting wiring left on the bike. Almost all KTM engines were actually 6 speeds, although some, (very few from what I have heard), implemented a longer locking plug inserted into the RH side engine case near the clutch actuator that in effect keeps the engine from going into 1st gear and into the neutral we are most familiar with. This effectively makes 2nd gear 1st and creates or exposes a new neutral position for lack of better explanation. This can be easily changed and is outlined in the owners manual and repair books. I have a copy and even a CD that Phast Phil made for me if you would like a copy. Tha aluminum swingarm was standard starting in 1979 (after the early MX-6 left over 1978 MC-5 run). I assume that this is a large fin engine. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S

[Paul Danik]

Mike,

   Yes, it is the larger fin engine. Thanks for the information.
Paul