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Makotosun

Maximum oversized piston for a DT1 250 68-71 barrel?

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Maximum oversized piston for a DT1 250 68-71 barrel? was created by type one

Hi 
what’s the max you can go as I have a corrosion issue from the seized piston.

can you go 1.0 over sized?

cheers
T1
DT1's mainly -
x4 1968 US (survivor, shiny resto, MX frame mods & early project)
1968 AUS
1969 Early B front yard ripper
1969 B scabby track bike
1969 B MX project
73 CT3 project
'77 z750 hard tail chop ......
BMW GSA 2018
08 Feb 2022 05:33 #1

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Replied by Bartman512 on topic Maximum oversized piston for a DT1 250 68-71 barrel?

I'm 4 over on my DT2. Had to go with a Wiseco piston as I couldn't find a Yamaha that big.
08 Feb 2022 05:41 #2

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Replied by Pedalcrazy on topic Maximum oversized piston for a DT1 250 68-71 barrel?

1.0 over I am assuming is the same as 4th oversize as folks talk in different perspectives. Each oversize is .25 mm so 4th oversize is sometimes called 1.0 over.

Yamaha produced up to 4th oversize for these bikes. Other manufacturers like Wiesco go to something like 2.0 (8th oversize). I don’t have anything more than 3rd oversize on my bikes so can’t confirm what has been manufactured, what will fit your cylinder or what is still available. At least this is a starting point for you!
1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B
1968 DT1 (3)
08 Feb 2022 06:41 #3

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Replied by type one on topic Maximum oversized piston for a DT1 250 68-71 barrel?

Thanks for the replies…. Appreciated 
cheers
T1
DT1's mainly -
x4 1968 US (survivor, shiny resto, MX frame mods & early project)
1968 AUS
1969 Early B front yard ripper
1969 B scabby track bike
1969 B MX project
73 CT3 project
'77 z750 hard tail chop ......
BMW GSA 2018
08 Feb 2022 14:11 #4

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