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Discussion Starter · #1 ·
Holy Crap ! My Compression Gage Is Possessed !!!

Bought a motor from a "Certified Master Marine Mechanic" that advertised 150 PSI

Got it home and am getting 100 !!! :mad:


I am going to check my Gage against another known Gage ...

If he Can't do some explaining OFF WITH HIS HEAD !!!


[smiley=greenchainsaw.gif] [smiley=frustrate2.gif]
 

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Cert. Yamaha technician
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Every guage reads different,.
I even proved it to the snap on guy. Took two of the same brand new guages off the truck and they were 13 psi off on the same engine
 

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Discussion Starter · #3 ·
I knew a guy he had two ...One for Buying and one for selling ...

I can see 13 not 50

But the seller may have checked hot ... I checked cold ...
 

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Discussion Starter · #5 ·
Thank You :)

another weird factor is the bolts for the lower have not been out for a long time ...

That to me equals NOT Equal fully "Checked Out" :mad:

That will do it
as long ss they are even and realistic, not to low
 

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01 Hells Bay Guide.07 ECC LOSTMEN-sold
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Exactly how are you checking compression? gives us the exact process step by step. Because it can make a huge difference in numbers. From one method to another. I think I may know why you are getting a lower number. But want to hear it from you. Not that what you are doing is wrong. You just have to compare apples to apples. ;)
 

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Discussion Starter · #7 ·
Lock carb open... Spray in fogging oil pull engine through to disperse ...


pull plugs ,,,shoot in more fogging oil and pull through several times

Install gage do test 8 pulls
 

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01 Hells Bay Guide.07 ECC LOSTMEN-sold
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1,363 Posts
Ok that's how I was taught. Just wanted to make sure all plugs were out. Some will just hit one ata a time. Which can lead to lower numbers. If they don't do a good job of bumping it over. You should be getting a high consistent number with plugs out. There is less resistance. So you can reach a higher RPM in theory possibly getting more compression.
 

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Discussion Starter · #9 ·
I have one motor reading too high !

Guess I'll have to go run the Snot out of it to see if it comes down a bit ... LOL :eek:

Break out the KLOTZ !!!
 
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