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what is the lowest compression reading acceptable for a 98

 
Whitecap36's Avatar
  • Answered by:Whitecap36
  • Marine Technician
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Customer Question

what is the lowest compression reading acceptable for a 98 yamaha 70BETO outboard

 

Optional Information:
Make (of engine): yamaha
Model (of engine): 70BETO
Year: 98
Horsepower: 70

Submitted: 361 days and 18 hours ago.
Category: Boat
Value: AU$34
Status: CLOSED
Expert:  MarineService8 replied361 days and 18 hours ago.


MarineService8 :

Usually they will be around 120 psi but it matters more that each cylinder is within 10% of each other any more and its considered to have damage to the piston, rings, or cylinder. example If #1 cylinder is 120 psi #2 is 115 and number 3 is 100 psi your looking at a problem on cylinder 3

Customer :

so a reading of 116 psi across all cylinders would be acceptable for a motor of that age

Accepted Answer

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Expert:  Whitecap36 replied361 days and 13 hours ago.

Hello, I'm Mike.
I'm happy to help you today. Please post back to this thread for any questions or concerns, either before or after payment.
Yes
116 is fine.
You need a minimum of 100# XXXXX combustion.

Expert TypeMarine Technician
Category: Boat
Pos. Feedback: 98.1 %
Accepts: 1508
Answered: 6/23/2012

Experience: 28 years Certified Marine Technician and past FL State Certified teaching degree

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