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Which compression tester?

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Guys,

 

I would like to check compression on my 250.  I have searched the threads on this forum and would like some more detailed information as to which compression tester you all are using. 

 

I see the Harbor Freight one gives lower readings than say the Auto Zone unit. 

 

I would like to purchase one from auto zone. 

Can anyone help me out as to which one works well?  

 

Thank you. 

 

http://www.autozone.com/autozone/accessories/Tools-Garage-and-Equipment/Compression-Tester/_/N-25j0?pageNumber=2

 

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The Harbor Freight one tested WAY low on my bike. And another bike with the exact same engine and mods. Therefore I knew the tester was the issue. I would look at a nice one from Summit or Jegs.

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I have a craftsman tester that I really like. Which ever one you get make sure it has an adapter that matches the thread length of the sparkplug you are using. My tester came with several different adapters.

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