Compression Tester

RevB said:
Effective compression ratios of piston port two strokes are typically much lower than an equivalent four stroke of the same bore/stroke so there is no apples to apples comparison. Typically two strokes are anywhere from 5:1 to 7.5:1.
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20210206_162104.jpgthis one is a little higher than than 7.5:1
 
StarTech said:
I use the Acton Professional Compression Tester CP7828A which comes with the important 10mm adapter. This tester was about $39 at Summit Racing.

OR a slightly different version here for even less.

https://www.mercari.com/us/item/m42...iJT9PHyw1iOKfpw_DrlgYWsLA_PxL-AmKY12WOKRTw9uM
Click to expand...


I also found that the CP7828A with all the adapters is a good go to tester.

I also have couple homemade types that are accurate buy usually reach for the 7828A.

If I happen to get a suspect low reading I can then reach for a 2nd opinion tester.
 
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