compression PSI
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Road Master
Joined: Oct 2009
Posts: 892
Likes: 10
From: in the wind
compression PSI
Do any of you folks know about what PSI a compression test should read on a 95'' . My readings are 160 psi on each jug. Does that sound right ? on a stock 88 the psi is 90 ,at least thats what the manual says.
Cruiser
Joined: Aug 2008
Posts: 164
Likes: 2
From: Rural Northern CA
Static Compression
It's been 25+ years since I've worked around air-cooled [aircraft] engines. 160# is excellent compression, & would be regarded as 'good' or "serviceable" down to 80# or so.
The real issue is not the total compression, but whether the 2 jugs are within 7-10 pounds of each other. I recall we rebuilt our individual aircraft engines when the compression dropped below 70 pounds or if the jugs were not within 10 lbs of each other.
The real issue is not the total compression, but whether the 2 jugs are within 7-10 pounds of each other. I recall we rebuilt our individual aircraft engines when the compression dropped below 70 pounds or if the jugs were not within 10 lbs of each other.
Road Master
Joined: Dec 2008
Posts: 872
Likes: 20
From: Niagara Falls Canada
my 103 with 255 cams compression
I took compression readings after I had broke the motor in.
197 psi in both cylinders. wish I would have taken reading of my stock motor before I tore it down for the 103 kit.
197 psi in both cylinders. wish I would have taken reading of my stock motor before I tore it down for the 103 kit.
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