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Makotosun

1975 DT250B oversized piston

  • shogun
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1975 DT250B oversized piston was created by shogun

I'm thinking of repairing the engine of my 1975 DT250B. Currently the standard one (69.96mm) is included.
There seems to be a scratch inside the cylinder, so I'm thinking of putting in a 71.00mm one.
Please tell me about piston kits that can be used in this case.
When I searched on eBay, I found that a WISECO piston kit with a size of 71.00 mm was sold for DT250 (part code: 234M07100)
Is this usable?
I would be happy if you could also tell me the evaluation of WISECO pistons.
 
03 Dec 2023 06:24 #1

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Replied by pahiker on topic 1975 DT250B oversized piston

Can't speak for compatibility, but used Wiseco prolite pistons in my CR500s and had no issues. Beat the crap out of 'em, lol.
1973 Yamaha RT3
2024 Suzuki DR650
2023 Triumph Tiger 1200 GT Pro
03 Dec 2023 06:37 #2

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  • MarkT
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Replied by MarkT on topic 1975 DT250B oversized piston

That's a huge jump in size for a "scratch".  Yamaha original, Wiseco, and Wossner should all be pistons you can find.  All are excellent quality.
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
03 Dec 2023 07:12 #3

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Replied by Enduro nut on topic 1975 DT250B oversized piston

I have the exact same bike and i had to go to 70.50MM with a Wiseco. Wiseco doesnt have .25 so going 10 over isnt an option at least at this time with them. They make excellent pistons. Depending on how bad the scratch is you might be ok with a simple hone and new set of rings.
03 Dec 2023 12:08 #4

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Replied by Ht1kid on topic 1975 DT250B oversized piston

Can you post a picture of your scratch you can use Imgur, google photos etc 
03 Dec 2023 14:07 #5

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Replied by shogun on topic 1975 DT250B oversized piston

WISECO seems to be highly reliable.
04 Dec 2023 02:33 #6

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Replied by shogun on topic 1975 DT250B oversized piston

Thank you for your reply.
I know that there is one every 0.50mm.
The cylinder seems to have deep scratches, so I'm thinking of going over 1.00mm instead of 0.50mm.
04 Dec 2023 02:35 #7

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Replied by shogun on topic 1975 DT250B oversized piston

Due to various circumstances, it is not possible to measure the cylinder before purchasing the piston.
I would like to purchase the cylinder and piston at the same time.
Is there any problem with the WISECO product, which has the piston and other rings integrated?
04 Dec 2023 02:38 #8

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