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Author Topic: 82 kx250 engine into a 79 frame?  (Read 2054 times)

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Offline bishboy

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82 kx250 engine into a 79 frame?
« on: July 18, 2013, 03:24:18 pm »
What are the chances that a 82 KX250 engine will fit in a 79 KX250 frame?  My initial thought is no due to the exhaust clearance?

Can someone tell me I'm wrong and that it will fit  ;)
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Offline John Orchard

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Re: 82 kx250 engine into a 79 frame?
« Reply #1 on: July 18, 2013, 04:22:36 pm »
I think it will fit, never done it so I couldn't say for sure, maybe cross-referencing some part no's might give a clue (Geoff !).

Do you have an '81 engine you can get your hands on?  I don't think there's much difference between the '79 to '82 in performance?  I've got a spare '79 engine, might stick it in a '82 frame ;-)
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Re: 82 kx250 engine into a 79 frame?
« Reply #2 on: July 18, 2013, 04:28:17 pm »
Quote from: bishboy on July 18, 2013, 03:24:18 pm
What are the chances that a 82 KX250 engine will fit in a 79 KX250 frame?  My initial thought is no due to the exhaust clearance?

Can someone tell me I'm wrong and that it will fit  ;)

Sorry don't know  ??? but I have to ask why  ???
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Offline Slakewell

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Re: 82 kx250 engine into a 79 frame?
« Reply #3 on: July 18, 2013, 04:39:58 pm »
If its from a single shock frame it would not be evo legal, surely finding a 79 engine is the answer or better yet buy KDX 400 engine?
« Last Edit: July 18, 2013, 04:52:26 pm by Slakewell »
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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 evo550

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Re: 82 kx250 engine into a 79 frame?
« Reply #4 on: July 18, 2013, 05:26:55 pm »
Isn't one side port and the other center exhaust port ?
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Offline Grunter215

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Re: 82 kx250 engine into a 79 frame?
« Reply #5 on: July 18, 2013, 05:55:49 pm »
Yeah like Evo said...'82 is centre-port so has semi-cradle frame, '79 frame is single downtube.
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Offline evo550

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Re: 82 kx250 engine into a 79 frame?
« Reply #6 on: July 18, 2013, 06:33:59 pm »
KDX 250 would be your best bet, they are a center port exhaust......
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Offline bishboy

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Re: 82 kx250 engine into a 79 frame?
« Reply #7 on: July 18, 2013, 08:17:30 pm »
I came across one at a good price and wanted the bike finished (yet to be started of course ::)) in time for classic dirt.

But if anyone has a A5 engine or KDX400 or any other side port engine, then I'd be interested!!!
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Offline bigk

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Re: 82 kx250 engine into a 79 frame?
« Reply #8 on: July 19, 2013, 08:16:16 am »
I have an '82 KX250 project if anyone's interested. Motor, frame & some parts done, nothing much else though.
K
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Offline JohnnyO

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Re: 82 kx250 engine into a 79 frame?
« Reply #9 on: July 19, 2013, 09:08:39 am »
The 82 motor won't fit the 79 frame without major modification. The 82 cases are part of the swingsrm pivot mount with the axle going through them, the 79 is totally different.
74-79 motor will bolt into your 79 frame..
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