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DT125A: Cylinder hone or top end swap?

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DT125A: Cylinder hone or top end swap? was created by YamFam

Hi All, I’m doing a motor refresh on a DT125A project and when I pulled the top end there was scoring on the piston and cylinder. I started looking for somewhere to hone the cylinder but then I started thinking, if I’m spending money for a hone and new piston should I just go ahead and do the old DT175 top end swap instead?

Two questions: if I do the swap what other changes need to be made? Carb? If you’d recommend a hone of the original cylinder can anyone recommend a place near Chicago or a shop I can ship to that you’ve used and has reasonable prices? Thanks in advance for any advice!
15 Jul 2021 17:21 #1

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Replied by JGersh on topic DT125A: Cylinder hone or top end swap?

Carb is the same for the DT125 and DT175 The only difference is several Jet sizes as displayed in the attached.  

 
2 - ‘68 DT1
‘70 RT1
‘70 CT1-B
2 - ‘70 HT-1’s
‘12 Triumph Scrambler
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Last edit: 15 Jul 2021 20:01 by JGersh.
15 Jul 2021 19:59 #2

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Replied by msavitt on topic DT125A: Cylinder hone or top end swap?

can you share pictures of piston and bore?
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15 Jul 2021 20:49 #3

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Replied by MarkT on topic DT125A: Cylinder hone or top end swap?

Depending on the scoring and wear you'll probably want to get it bored to the nearest oversize that will clean it up and give you a fresh bore.

175 conversion is worth it if you can find a cylinder and head.  Not a difficult swap so might be good to fix yours and look for parts. 
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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15 Jul 2021 20:56 #4

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Replied by YamFam on topic DT125A: Cylinder hone or top end swap?

Appreciate the advice all! Not many good options on eBay so I’ll try posting a “WTB DT175 top end” in the buy/sell forum to see if one of our fellow fanatics has one

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16 Jul 2021 15:06 #5

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