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DT125R Forum -> CYLINDERS -> Compression question
Post Info TOPIC: Compression question
Barron89


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Compression question
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Does anyone know what the compression rating is for a 3bn head. As I'm going to use a tester tonight. If the compression is about correct does that mean that there shouldn't be a problem in the top end causing a severe lack of power? Or do other factors come into this? Any advice is greatly appreciated!

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AndyYam


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Not from experience but I read on another forum when someone swapped their 3bn for a 3mb head they went from 95 to 105 psi.

so

3BN head should be 95psi based on that. Should be in the haynes manual

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Barron89


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Cheers man, mine read 78 so I'm stripping it.

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AndyYam


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Yeah at 78 I'd definitly strip. One other quick way to check. Chucke some 2 stroke down the spark plug hole ( only a little) and get the compression tester in a do a quick check. the oil wil fill the gaps around the rings and brng the compressions up for a couple of kicks.

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