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DT125 MK3 Pistons


Ollie1995
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Hi, I recently purchased a seized MK3 DT125 engine that required me to drill holes in the piston to extract it so it's no longer useable. I measured it and got 55.84mm but from what I've read this is actually 56mm (standard size). Are there any differences between mk3 models and the later model pistons?

Thanks, Ollie.

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  • Moderator

You really need to have the piston matched to the bore, especially if the piston was seized. Get the barrel re-bored and ask them to match a piston to the re-bore.

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You really need to have the piston matched to the bore, especially if the piston was seized. Get the barrel re-bored and ask them to match a piston to the re-bore.

Cheers for the reply, the engines been sat for a while so the rings seized to the barrel, the barrel looks to be fine with no scoring so I was just hoping to get a new piston.

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  • Moderator

You may get away with it but you might not.

If you cost out the gaskets, rings, small end and piston, the cost of adding a rebore will only be another £30. If the barrel is ovalled or worn you would have just wasted your money by trying to get away with not getting a bore on it.

Your choice but I wouldn't risk it with an unknown engine.

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Dirty do you use SEP?

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