DTDan Posted January 1, 2013 Share Posted January 1, 2013 Hi guys, i've just joined here after recently buying a dt125r (1998) and was wondering if the dt 200 cylinder and head assembly would bolt straight on the 125 crank cases, has anyone done this before and would it be possible to use the standard 125 conrod with the 200 cylinder and piston. Cheers in advance. Dan Link to comment Share on other sites More sharing options...
Moderator Airhead Posted January 1, 2013 Moderator Share Posted January 1, 2013 Difficult question Dan, I dont know the answer to that one, are you aware of the athena 170cc kit that is available? Link to comment Share on other sites More sharing options...
DTDan Posted January 1, 2013 Author Share Posted January 1, 2013 Yes mate im aware of the kit but i have a dt200 cylinder and head sitting around - a hell of alot cheaper and more cc's Link to comment Share on other sites More sharing options...
Moderator Cynic Posted January 2, 2013 Moderator Share Posted January 2, 2013 Think some of the extra cc comes from stroking the crank. You already have the best option. Give it a try and see. Once the top ends are on the bench its just a case of measuring up. Link to comment Share on other sites More sharing options...
AndyDtr08 Posted January 3, 2013 Share Posted January 3, 2013 I'm pretty sure it will. I know of someone who has fitted the 3xp ( wr200) head and barrel onto a dt125r bottom end. They rebuilt with different crank though. Would be pretty easy to measure a dt125r cylinder and compare sizses to your one. If you need the measurements of a dtr cylinder/ head let me know and i can sort that out for you. Is this from a 3ET bike then? Link to comment Share on other sites More sharing options...
DTDan Posted January 5, 2013 Author Share Posted January 5, 2013 Thanks for the comments guys, found some time to get out in the shed and have a close look at the two cylinders tonight, it appears they are completly different the 125 has no provision for the reed block where as the 200 does - im thinking it must be off an earlier bike and as i was given it years back and told it was off an dt200 thats all i have to go on ! Which brings me round to thinking would it be possible to remove the bore liner from the 125 cylinder and have the cylinder its self machined out larger to fit a bigger liner ?? Has anyone tried this before ?? Cheers folks. Dan Link to comment Share on other sites More sharing options...
Moderator Airhead Posted January 5, 2013 Moderator Share Posted January 5, 2013 The 125 has crancase induction, It's a more modern way Link to comment Share on other sites More sharing options...
AndyDtr08 Posted January 10, 2013 Share Posted January 10, 2013 If it has the reed valve induction built into the cylinders its going to be an 80's or earlier barrel i would have thought. What are the numbers on it? Link to comment Share on other sites More sharing options...
Moderator Cynic Posted January 10, 2013 Moderator Share Posted January 10, 2013 The 125 has crancase induction, It's a more modern way Introduced in 1987 :-D:-D:-D Link to comment Share on other sites More sharing options...
DTDan Posted January 14, 2013 Author Share Posted January 14, 2013 Yes people i now realise its an earlier cylinder and no good for my application but has anyone ever bored out a 125 cylinder to nearer the 200cc mark ?? Link to comment Share on other sites More sharing options...
AndyDtr08 Posted January 15, 2013 Share Posted January 15, 2013 The liner wouldn't have enough to be able to and you'd probably get too close to the water jacket anyway. Link to comment Share on other sites More sharing options...
Moderator Cynic Posted January 15, 2013 Moderator Share Posted January 15, 2013 What o/size is the 200 barrel. I feel a plan coming on...... Link to comment Share on other sites More sharing options...
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