Stock Compression.....

June 7, 2002, 5:11 pm

What is the consensus on the compression of a Stock U150 motor? I never measured mine but have heard it's in the 125-135 range..What have some of you seen?

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Re: Stock Compression.....

June 7, 2002, 5:37 pm

Mine showed 125psi before milling the stock head. I checked it with all plugs removed, throttle wide open & again with it closed.....came up with the same number. Dwight

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Re: Stock Compression.....

June 8, 2002, 12:47 am

What did you get AFTER the head was milled?21 views and only one person checked their stock compression......but who am I to talk....

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Re: Stock Compression.....

June 8, 2002, 1:15 am

quin, i have never checked mine i heard it wasnt very accurate because of the way the intake n all was setup. there is some special way to do it which i dont think I care to do just out of plain...

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Re: Stock Compression.....

June 10, 2002, 2:58 am

I understand it is hard to measure an Ultra's compression reliably because the way the carbs work. But I did pressure test all of my cylinders before and after I put the ADA head on. 128 Before142...

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Re: Stock Compression.....

June 10, 2002, 11:47 am

I pulled the carbs when I tested mine, took them out of the equation.

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I believe stock compression can be anywhere from 90 - 150. I think that is what the manual says somewhere... someone correct me if I am wrong.Scott Farris #200 Region-5 Novice 1200 Superstock2001 -...

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