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Makotosun

Who is the DT2 ENGINE GURU that has time to talk?

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Replied by rsteve56 on topic Who is the DT2 ENGINE GURU that has time to talk?

The Wiseco piston you want is  234M07150  for your 1.5mm oversize.
You can get up to 1mm oversize in Yamaha brand.  438-11638-01-00
The following user(s) Liked this Post: Snglsmkr
27 Jan 2022 10:51 #11

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Replied by tzsv4k on topic Who is the DT2 ENGINE GURU that has time to talk?

There seems to be a 'hole' in years and part numbers with regard to after market makers of pistons / top end parts.
Wiseco and Vintco don't list a piston for 72' DT250's
Wisco and Vintco DO list pistons for 74' DT 250's.
What's interesting is Yamaha's piston part numbers for 72' / 73' / 74' are all the same part numbers.
I wonder if the aftermarket engineers saw something different or forgot something.
My 2 cent's ....
Twin 73' DT3 250's, 73' MX 360, 83' TT600 , 73' MX 100
05 Feb 2022 14:28 #12

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Replied by Swoop56 on topic Who is the DT2 ENGINE GURU that has time to talk?

DT2 / DT3 OEM Yamaha pistons use 311 prefix on the part numbers .
DT 250 A pistons use 438 prefix .I think they are no longer available as new ex factory , though I could be wrong .
Partzilla and the like , then show a superceded part  number that will fit .
In this case , showing DT 250 A number for DT2 fitment .
There appear to be plenty of DT2 pistons available NOS on Ebay .
05 Feb 2022 16:17 #13

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