OzVMX Forum

Marque Remarks => Kawasaki => Topic started by: bishboy on July 18, 2013, 03:24:18 pm

Title: 82 kx250 engine into a 79 frame?
Post by: 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  ;)

Title: Re: 82 kx250 engine into a 79 frame?
Post by: John Orchard 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 ;-)

Title: Re: 82 kx250 engine into a 79 frame?
Post by: TM BILL 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  ???

Title: Re: 82 kx250 engine into a 79 frame?
Post by: Slakewell 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?

Title: Re: 82 kx250 engine into a 79 frame?
Post by: evo550 on July 18, 2013, 05:26:55 pm

Isn't one side port and the other center exhaust port ?

Title: Re: 82 kx250 engine into a 79 frame?
Post by: Grunter215 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.

Title: Re: 82 kx250 engine into a 79 frame?
Post by: evo550 on July 18, 2013, 06:33:59 pm

KDX 250 would be your best bet, they are a center port exhaust......

Title: Re: 82 kx250 engine into a 79 frame?
Post by: bishboy 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!!!

Title: Re: 82 kx250 engine into a 79 frame?
Post by: bigk 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

Title: Re: 82 kx250 engine into a 79 frame?
Post by: JohnnyO 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..