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DT125R Forum -> Top End -> How much compression should ther be
Post Info TOPIC: How much compression should ther be
ezegreenfingers


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How much compression should ther be
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My dtr seems Verry light to kick over is every ones the same or should I be lookin at a new piston

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ToySoldier


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not to little but not to much

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ezegreenfingers


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Think im gona have to get a compression test on monday befor I think about fitting new piston

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AndyYam


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Depends on what head you have on. Haynes will state a number. I've seen 95 with a 3bn cylinder head and 105 psi with a 3MB head on.

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the only way is YAMAHA DTR


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you can have between 110-120 in most tuned 2strokes , even more ,but in the DANGER ZONE



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ezegreenfingers


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Cheers guys ended up getting new piston

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NEV


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Just did a compression test on mine, the info on the compression tester manual says it will show a lower compression reading till the piston & rings are bedded in properly, and seeing as my barrel was re-honed last week, I'm presuming it will get higher as its run in.

3mb barrel and I'd say thats reading 90 psi



Anyone else with a compression tester so I can compare??




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ezegreenfingers


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Just got this to test mine after getting. New piston there was defiantly a change bu I wan check it

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