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Dt1Mx piston in an Rt2/3

  • 45chop
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Dt1Mx piston in an Rt2/3 was created by 45chop

Hi all,
Anyone know of any issues fitting a dt1mx piston in a rt2 ? Seems like mx pistons still available while rt pistons no more.
Thanks 
03 Oct 2022 14:03 #1

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Replied by 1971DT250 on topic Dt1Mx piston in an Rt2/3

DT1 is a 250.

RT2 is a 360.
The hours spent riding my Enduros is not deducted from my life span.
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03 Oct 2022 15:46 #2

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Replied by Ht1kid on topic Dt1Mx piston in an Rt2/3

If you have a 72 360 it’s a Rt2 and you need a rt2 or rt3 piston because yours is a reed valve engine Rt1 won’t work because it’s a piston port engine 
03 Oct 2022 16:39 #3

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Replied by RT325 on topic Dt1Mx piston in an Rt2/3

I intend to try an RT1 piston oneday. It'll run but be iunteresting to see how good or bad. Lack of holes in the shirt wont stop it but how much get up & go i'll loose i'm yet find out. Same pin height & everything. In fact i 'did' try one but cut a rediculouse hole in the back then chickened out after thrashing it around for quite a while. Went good too, but had one hand on the clutch waiting for the skirt to drop off. Might have the pic somewhere handy.
Found it. 
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Last edit: 03 Oct 2022 17:30 by RT325.
03 Oct 2022 17:29 #4

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Replied by MarkT on topic Dt1Mx piston in an Rt2/3

Some very good reed valve engines did not have holes in the piston skirt.  They still had boost transfer ports fed by reed valve when piston was down far enough to uncover the transfer ports.  It would probably run fine.

I think I commented on this before...  but if you want to cut holes in cast piston, best do it up high like RT325 did.

Cutting holes or even opening holes in the skirt of a cast piston often results in skirt breakage which make a real mess of the engine. 
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
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03 Oct 2022 18:00 #5

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Replied by RT325 on topic Dt1Mx piston in an Rt2/3

but if you want to cut holes in cast piston, best do it up high like RT325 did.
Just not that big haha.
03 Oct 2022 18:10 #6

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