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02 Sep 2019
Your admin has not been on the site much as of late as my main computer apparently seized up :( I have had limited access, but will be back soon. Thanks. Mako
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TOPIC: 75dt125 pump flow

75dt125 pump flow 10 Sep 2019 00:27 #1

  • liferbiker
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I did not see what pump flow (in cc's) is supposed to be in service manual

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75dt125 pump flow 10 Sep 2019 05:36 #2

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Have to look in the main body of the manual... page 47 of combine A/B/C manual.... not sure why they didn't put it in the spec charts.






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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

75dt125 pump flow 10 Sep 2019 09:27 #3

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Thanks Mark, I looked through manual & got the other specs, but it was a "quickie lookie", was it in that sideways section(LOL). Who needs a manual with you around, kidding, of course, (but its true!) Thanks again. Does a 175 jug, slug & head fit (as on early bikes), and what years fit?
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75dt125 pump flow 10 Sep 2019 11:43 #4

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Your 75 DT125 electric start is basically an early AT/CT engine with minor upgrades.

(the US 175 got a major engine redesign in 1974... The e-start 125 stayed with the older AT/CT design)

Reed valve 72-76 175 enduro cylinder and head bolts on... 1976 is the first year they moved the oil injection port to the carb throat from cylinder so if you get a 1976 DT175 cylinder/head you'll need to add an oil injector fitting to the carb... pretty easy to do... carb usually has blank boss you drill and HVC sells RD350 fittings if you don't want to find one.

You also need the piston pin and upper rod bearing from the 175 as they are slightly wider that the 125 parts. Connecting rod is 100% interchangeable on the 125 and 175 from 69-81 so no rod changes needed.

Since ebay sellers often mis-identify, you need to look for a 175 with the long through studs like the early model... not the 78-on design (no 1977 DT125 or 175 in US) that has the short studs to bolt the cylinder to the case and then separate short studs to hold the head to the cylinder.

One caveat... a YZ175 cylinder will not fit... stud spacing is different. Not likely you'll come across one because the YZ175 is a rare one-year only cylinder/head but just in case you were thinking of that possibility... it won't work without a lot of welding and machine work. :whistle:

:Buds

P.S. Nope... the chart was way into the manual back in the assembly section I think... I posted the page number I think.
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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

75dt125 pump flow 10 Sep 2019 22:44 #5

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Thanks (yet again) Mark, I have not had any time to fiddle W/new toy, Oh, I did air up tire F, rear has a hole, I'm thinking ahead as although I owned a brand new AT1 in 69, I was 13 & 30 or 40 lbs ago, & I figured if it needs anything more than a re-ring, its goin up as more torque is always good. This one's getting mechanical servicing only as I really want a 400. I had a couple 400 racers & they started nice & even used hard didn't give me any grief. I realize they are not like the new one's I had 40+ years ago, But I think their still one of the best Yamaha's, or am I kidding myself....

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