Author Topic: Avail of DT1MX parts list.  (Read 436 times)

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Offline John Orchard

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Avail of DT1MX parts list.
« on: December 19, 2018, 05:31:35 PM »
I'm just needing to start doing my homework on DT1MX and other Yam models that have interchangeable parts. Can anyone give me a starting point?  Thanks in advance.

Regards,John.
Johnny O - Tahition_Red factory rider.

Offline Iain Cameron

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Re: Avail of DT1MX parts list.
« Reply #1 on: December 19, 2018, 06:19:34 PM »
John just about every part on a pre reed motor will inter change and a far bit of a reed one as well . Iain
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 John Orchard

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Re: Avail of DT1MX parts list.
« Reply #2 on: December 19, 2018, 08:14:39 PM »
John just about every part on a pre reed motor will inter change and a far bit of a reed one as well . Iain


Thanks Iain :-)  Do RT1 parts fit; like clutch & gearbox?
Johnny O - Tahition_Red factory rider.

Offline Iain Cameron

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Re: Avail of DT1MX parts list.
« Reply #3 on: December 19, 2018, 08:38:11 PM »
Yes most are a direct swap John .
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 TT5 Matt

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Re: Avail of DT1MX parts list.
« Reply #4 on: December 19, 2018, 10:46:12 PM »
so is the rt1 just a big bore/same stroke as the dt1 with cases to match the increased bore size or is there more to it?

Offline crossedup2

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Re: Avail of DT1MX parts list.
« Reply #5 on: December 22, 2018, 12:02:26 PM »
RT1 and DT1 have different Bore Strokes.

The interchange of parts is pretty amazing.
My RT1 has MX250A gearbox, YZ250D clutch plates and friction plates with springs, IT250D Stator and Flywheel, YZ400 CDI.
The cases are RT3.

The RT1 frame and wheels have some differences to RT2-3 but nothing that is not allowed under the Regs.

If you have the time, you can chase down the many different gearbox ratios in the MX250. Eg you can make a super close ratio if you want.

If the time ever comes and I find myself not racing MX, I'll register the RT1 (I left the lighting Coil in). Make a hell of a street bike at the lights.

Good Luck with it.

Peter B

Anything Yamaha. AT1, CT1 (X3), RT1, DT3 (x3), YZ125X,  YZ250E, YZ400D, IT175E, IT250H, IT490K . Always looking for Pre 78 Yamaha stuff....

Offline John Orchard

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Re: Avail of DT1MX parts list.
« Reply #6 on: December 23, 2018, 05:48:54 PM »
l see DT1 and later reed engines have a different rod legth. lf l'm running a DT1MX barrel on a DT2 bottom end, can l use a Suz TS250 piston to make up the difference?
Johnny O - Tahition_Red factory rider.