Boxsoffrogs Posted May 21 Share Posted May 21 Looking for a little help as I’m totally stumped. DT MX 175. Top end rebuild. A modern replacement has an inlet port stud spacing of 71mm x 51mm. The part info says it will fit a 1981 - w reg. The actual one on the bike that needs a rebuild is about 57mm x 47mm The engine number code is 2k4 denoting 1979-1982 so the part should fit but it won’t. The new has a twin inlet and the original has a single inlet. 1st pick is the new part, others are the old. Quote Link to comment Share on other sites More sharing options...
NE0 Posted May 22 Share Posted May 22 Hi there Boxoffrogs, you've unfortunately posted in the wrong section, this is the area for 1st posts to introduce yourself, this needs to be in the Workshop section. As you're a paid up member you can be forgiven, hopefully a mod can move this into the right section. As regards to your DT cylinder , is this a Psychic one? which i think means you need their 70mm race carb to go with it as it's not compatible with the OEM carb. see ebay photo in their listing..https://www.ebay.co.uk/itm/303728870851?itmmeta=01HYG5QDDRHVF8964F7Y944430&hash=item46b7a6c5c3:g:jacAAOSwVI5haWBL&itmprp=enc%3AAQAJAAAAwDaUsbdex5Z%2FN%2F%2BeVDKSxvLRGMTuGxYA58GZnk0VNgNrMmiz1O4x%2Fe%2Bo2peb%2B%2B13MeGLpf9Xy%2B%2FIQB8%2BnvKl688piZg5w3vDIhIguWQq7J91Gz7xt3pHMo%2FYppxpNzxSglAmHzHLGvT2%2BkRYZENreX3qzShHmEOoQX9AuUP6qf6eV%2FcCGzyq99Inak%2FkOMHHAdJWPvmVM3iCYU2F%2B6MKXHB3UWdfU0eCAOcoqUbdH5Tl6WLsmKl05zgii4PQlfIbcw%3D%3D|tkp%3ABk9SR4rX3YX0Yw 1 Quote Link to comment Share on other sites More sharing options...
Moderator Snakebite68 Posted May 22 Moderator Share Posted May 22 Moved... 1 Quote Link to comment Share on other sites More sharing options...
Boxsoffrogs Posted May 23 Author Share Posted May 23 On 5/22/2024 at 2:00 PM, NE0 said: Hi there Boxoffrogs, you've unfortunately posted in the wrong section, this is the area for 1st posts to introduce yourself, this needs to be in the Workshop section. As you're a paid up member you can be forgiven, hopefully a mod can move this into the right section. As regards to your DT cylinder , is this a Psychic one? which i think means you need their 70mm race carb to go with it as it's not compatible with the OEM carb. see ebay photo in their listing..https://www.ebay.co.uk/itm/303728870851?itmmeta=01HYG5QDDRHVF8964F7Y944430&hash=item46b7a6c5c3:g:jacAAOSwVI5haWBL&itmprp=enc%3AAQAJAAAAwDaUsbdex5Z%2FN%2F%2BeVDKSxvLRGMTuGxYA58GZnk0VNgNrMmiz1O4x%2Fe%2Bo2peb%2B%2B13MeGLpf9Xy%2B%2FIQB8%2BnvKl688piZg5w3vDIhIguWQq7J91Gz7xt3pHMo%2FYppxpNzxSglAmHzHLGvT2%2BkRYZENreX3qzShHmEOoQX9AuUP6qf6eV%2FcCGzyq99Inak%2FkOMHHAdJWPvmVM3iCYU2F%2B6MKXHB3UWdfU0eCAOcoqUbdH5Tl6WLsmKl05zgii4PQlfIbcw%3D%3D|tkp%3ABk9SR4rX3YX0Yw Apologies and thank you. I’ve seen the Psych ones on eBay as well. These are twin port as apposed to the single port that we have, and they seem to make it clear that it won’t fit ours Also the studs for the reed is quite a lot larger than what we have. In an ideal world we’re trying to keep it as true to period as we can, so I guess I’m hunting for a needle in a haystack and hoping that someone out there as one from this period. It’s actually my son’s bike, he’s 20 and loves it, albeit a little down hearted at the moment. On the plus side neither of us knew a thing about how it works until a week ago and we’re learning as we go. Frustrating and rewarding at the same time. Thanks for reading and taking an interest, it’s much appreciated. 18 hours ago, Snakebite68 said: Moved... apologies and thank u. Quote Link to comment Share on other sites More sharing options...
Moderator Snakebite68 Posted May 23 Moderator Share Posted May 23 2 hours ago, Boxsoffrogs said: apologies and thank u. Not a problem... Quote Link to comment Share on other sites More sharing options...
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