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Author Topic: 74 YZ motor  (Read 1364 times)

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Offline Iain Cameron

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74 YZ motor
« on: January 12, 2014, 09:40:26 am »
HI gents just a quick question , will a DT3 cylinder fit onto a 1974  YZ 250 bottom end  . I have a very good cylinder that has been ported to YZ specs and its a shame to waste  it . Iain
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Yamaha tragic ; dt1, rt1, dt2, rt2, dt2mx , rt2mx , mx250, mx360,sc500, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 , dt100 , xr75 ko xr80 03 , it175 82 . Not a member of any club

Offline farmpro

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Re: 74 YZ motor
« Reply #1 on: January 12, 2014, 10:47:16 am »
Ian !!!

It should work fine.You should be able to press the inner piece out of the exhaust flange and then match the exhaust opening on the cylinder to the flange opening.The YZ pipe will slip over the outside of the flange just like the YZ does.


Bill Davis          Texas Vintage Racing Club   
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Offline firko

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Re: 74 YZ motor
« Reply #2 on: January 12, 2014, 11:01:24 am »
Everything Bill says...I'm currently doing the reverse....fitting a YZ cylinder to a DTMX bottom end.
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'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha

Offline Iain Cameron

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Re: 74 YZ motor
« Reply #3 on: January 12, 2014, 12:29:16 pm »
Ive just scored a frame and cases from Joan and I have a spare DT2MX motor for the internals but Ive had this cylinder (ported by MMT ) for years just sitting on the bench . Most of the other YZb parts Ive been collecting for ages as the YZb has been on my wish list for almost as long as the DT2MX and RT2MX . Iain
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Yamaha tragic ; dt1, rt1, dt2, rt2, dt2mx , rt2mx , mx250, mx360,sc500, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 , dt100 , xr75 ko xr80 03 , it175 82 . Not a member of any club
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