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Author Topic: Help with KTM id  (Read 2447 times)

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Roostin440

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Help with KTM id
« on: March 20, 2011, 08:17:19 am »
Hi,
A friend brought his new to him KTM over for me to restore for him. I need a little help with the id. The numbers are..
Frame. 00820548 I think is 1980?
Motor.  5503348  I think is 400 ?
The plastic has been changed to who knows what, but all in all it is a good project bike.

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Offline Slakewell

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Re: Help with KTM id
« Reply #1 on: March 20, 2011, 09:41:48 am »
My guess would be an 81 model 390 the frame made in 1980. If you friend dosen't like it let me know I would take it off his hands.
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Current bikes. KTM MC 250 77 Husky CR 360 77, Husky 82 420 Auto Bitsa XR 200 project. Dont need a pickle just need to ride my motorcickle

Roostin440

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Re: Help with KTM id
« Reply #2 on: March 23, 2011, 02:21:59 am »
I ran the numbers by Al Buehner and it turns out it is a 1980 420. I found a 1981 125 gas tank to replace the monstrosity that was on it. I have not found a source for a air boot from the carb to the airbox. Most everything else seems to be available.
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Offline Slakewell

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Re: Help with KTM id
« Reply #3 on: March 23, 2011, 08:07:47 am »
Brad Lewis makes repro air boots. Most 420's are MX models with the 390 being enduro.
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Current bikes. KTM MC 250 77 Husky CR 360 77, Husky 82 420 Auto Bitsa XR 200 project. Dont need a pickle just need to ride my motorcickle

Roostin440

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Re: Help with KTM id
« Reply #4 on: March 23, 2011, 12:23:33 pm »
I'll yank the head and measure the piston. The motor has wiring for lights so maybe it is a 420 lower and a 390 top end?
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Offline Slakewell

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Re: Help with KTM id
« Reply #5 on: March 23, 2011, 12:29:11 pm »
The 420 is a rare bike in Aus as most imports were 390's and the 420 were for only 2 models before going to 495. Could be a 390 with a 420 top end? You can build a very nice MX bike from what you have there. If you wish to talk to Mr KTM aka Brad Lewis PM me and Ill pass on details.
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Current bikes. KTM MC 250 77 Husky CR 360 77, Husky 82 420 Auto Bitsa XR 200 project. Dont need a pickle just need to ride my motorcickle

Offline bigk

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Re: Help with KTM id
« Reply #6 on: March 23, 2011, 08:08:47 pm »
You can't put a 420 piston on a 390 rod, the top bearing is a different size. Consequently I have a new genuine KTM 420 piston kit doing nothing! Don't think it's standard size, can't remember. It's availabale if anyone can use it.
Cheer,
K
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Offline ozktm

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Re: Help with KTM id
« Reply #7 on: March 25, 2011, 10:40:25 pm »
From '81 motor Parts book both 390 and 495 have the same Rod Kit Part number 560.30.015.044
There only difference is the piston/liitle end bearing /pin.
Is this true?
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Regards,
Adrian Goold #101

'72 KTM 175 |'74.5 KTM 250 |'74.5 KTM 400 |Hagon/KTM 250 proj|'76 MC5 250 Project |'76 MC5 400|'78 KTM 250 Project |'81 KTM 250 MC | '81 KTM 495 MC

Offline Tossa

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Re: Help with KTM id
« Reply #8 on: March 25, 2011, 11:28:34 pm »
I may be totally wrong, but then again it's a regular occurrence but triple tree top looks like an 80 model,
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Roostin440

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Re: Help with KTM id
« Reply #9 on: March 26, 2011, 12:30:17 pm »
I pulled the head and the 82mm piston makes it a 390. Tried to fire it up with the bing. With a new slide and a rebuild kit it leaked all over the place. Upon trying to figure out what was wrong the float crumbled in my hands. So a new 38mm Mikuni is on the way. I am guessing the carb to airbox boot will be a problem with the mikuni.

We decided to just restore the bike instead of trying to start it first. It is all tore down now and a load of parts are on the way.
« Last Edit: April 22, 2011, 12:05:22 pm by Roostin440 »
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