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Old 11-24-2014, 03:39 AM   #1
danny4646 OP
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Dr 250 project

Hi all

Firstly im Dan from the uk

Im a Hgv technician / shift forman

Own a soozk gsxr 7/1216 fighter
kwak z1000 a1h
and finally the little dr250

Bought her as a 250s jap import

Fitted gs500 wheels ( using the forms help ;) )
kxf250 exhaust system and DR350 forks and shock to get rif of the silly height adjustment

Ill up loads pics soon :)

But here is where it goes wrong

Kick start jams, and not high compression jam either, SOLID! !

Strip her down and find left crank bearing shattered!

So plan, erm, well mamy plans later and some research, is to find a dr350 crank barrel and piston and do a 250/350 hybrid?!

Thanks

Dan
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Old 11-24-2014, 04:41 AM   #2
danny4646 OP
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pics as promised

right now before i go too far ahead of my self....

please can some one confirm the following

dr350 crank fits into 250 cases, thus using the better 250 5&6th gears,
but are the crank bearings the same?

will the cases need modifying to accept the 350 cylinder and the liner clears the crank?

will i get away using the 250 head on the 350 cyclinder ( there identical bar port sizes?)

20140726 163357

20140726 163426

20140726 163451

20141123 174248

20141123 174311
thanks

dan
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Old 11-24-2014, 06:24 AM   #3
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Also the balancer shaft if I'm doing a 250/350 hybrid should I try source the 350 shaft or use rhe 250, or are the identical? ?
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Old 11-24-2014, 06:49 AM   #4
plugeye
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best way to ensure parts interchanging is to compare on-line parts fiche.
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so what
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Old 12-01-2014, 04:46 AM   #5
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New bearings throughout, hope fully scored a complete 350 s bottom end with piston and barrel also
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Old 12-01-2014, 07:02 AM   #6
Jacl-Kampuchea
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I've been planning a similar increase in size on my DR250 and I think, from what I have read, that the small end of the conrod on the 350 is 1mm bigger and that's the only critical difference.

But I'm not 100% sure. There is a big bore kit available for the 350 that uses a drz400 piston which I want to use.

Right now I am gathering parts, so I'll keep an eye on this.

You know, the DR350 thread in this forum has a lot of info.
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Old 01-02-2015, 12:48 PM   #7
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Well been a while, bought a dr350 engine ( in bits!! )

Head and cam is shot, so wondered if anyone has put the 350 valves into a 250 head? ?

Ill add pics tomorow,,

Had the balance gear crank pin welded in and bearings and transmission back in the case half
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Old 01-02-2015, 09:19 PM   #8
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