Posted January 1, 201312 yr 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
January 1, 201312 yr Moderator Difficult question Dan, I dont know the answer to that one, are you aware of the athena 170cc kit that is available?
January 1, 201312 yr Author 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
January 2, 201312 yr Moderator 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.
January 3, 201312 yr 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?
January 5, 201312 yr Author 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
January 10, 201312 yr 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?
January 10, 201312 yr Moderator The 125 has crancase induction, It's a more modern way Introduced in 1987 :-D:-D:-D
January 14, 201312 yr Author 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 ??
January 15, 201312 yr The liner wouldn't have enough to be able to and you'd probably get too close to the water jacket anyway.
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