What compression reading should i be seeing?

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j_brawner
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What compression reading should i be seeing?

Post by j_brawner »

Bike isn't running and did a compression test and it was showing aound 35 PSI. Is that about right or what should it be?

85' Honda Aero 50
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devenex
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Re: What compression reading should i be seeing?

Post by devenex »

It should be 90+ PSI.
1986 Spree w/ '87 SE50 motor
1985 Aero 50 w/ Dio motor: On Hold
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burnt_toast
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Re: What compression reading should i be seeing?

Post by burnt_toast »

j_brawner wrote:Bike isn't running and did a compression test and it was showing aound 35 PSI. Is that about right or what should it be?

85' Honda Aero 50
top end is dead at 35psi

get new rings at minimum, or rings and piston

check condition of cyl, if no major scoring or scratches can reuse
projects galore :nerd:
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eliteguy50
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Re: What compression reading should i be seeing?

Post by eliteguy50 »

The lowest compression I have seen on a running unit is 60 psi but it would barely go anywhere, honda specs compression to be 114 to 172 psi as good but I agree with devonex, 90 psi is just fine.
motormike wrote:Errands become adventures.
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Lunytune
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Re: What compression reading should i be seeing?

Post by Lunytune »

35 is about what I got on last two overhauls I've done, both had broken rings.
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