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Compression Check

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50man

03-29-2002 03:09:18




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What's the proper way to check the compression in a 2 cylinder? Also will I need a special adapter to fit the larger plug hole as I'm sure any tester I'll get is probably made for auto plugs?




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Jack

03-29-2002 07:11:25




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 Re: Compression Check in reply to 50man, 03-29-2002 03:09:18  
My tester has an o-ring on it and it fits big holes and the small ones.Pull both plugs out and install the compression checker into no 1 cylinder.Pull the coil wire off(just for safty).Open the throttle up and hit the starter.After a few revolutions of the crank you should have a good idea if what you have and you can move on to number two.Hope this helps.Jack(TN).



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Tractor 1

03-29-2002 19:16:39




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 Re: Re: Compression Check in reply to Jack, 03-29-2002 07:11:25  
50man, The compression on a new engine with rings seated should be 120 P.S.I. @200 R.P.M.(cranking speed) with throttle wide open. Pressures should not vary more then 10 pounds between cylinders at any time. Fifty Fan.



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50man

03-29-2002 17:50:20




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 Re: Re: Compression Check in reply to Jack, 03-29-2002 07:11:25  
Thanks for your help.Any idea how much compression I should look for on a 50?



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Jack

03-30-2002 07:37:54




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 Re: Re: Re: Compression Check in reply to 50man, 03-29-2002 17:50:20  
100 to 125 would be ideal for stock pulling.My friends 50 has 125 psi and pulls good in the 5500lb class.Let us know how it turns out.Later,Jack.



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