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ruckus3313
06-19-2009, 04:27 PM
I just have a simple question. This is my first posting under the chrysler forum as I have a volvo penta i/o. A good friend of mine has a 1970 Chrysler Outboard 70Hp. We did a compression test and its about 100lbs across the 3 cyl's...What is the recommended psi for this motor??any help would be great!!thanks in advance

justaspark
06-19-2009, 04:43 PM
"Comp 90_120 age of motor,use,will change comp39 years of wear on rings cylinders.as long as the readings arent more than 10 psi difference between all 3.add more oil to premix help with compression."

ruckus3313
06-19-2009, 04:51 PM
hey thanks for the quick response. Greatly needed!!! yeah its on a 14ft checkmate and it runs really good buy its just really coldblooded to get it going!! Cleaned all carbs changed plugs runs great. Now only if we can get the shift cable adjusted to get reverse to work

ruckus3313
06-19-2009, 04:55 PM
hey thanks for the quick response. Greatly needed!!! yeah its on a 14ft checkmate and it runs really good buy its just really coldblooded to get it going!! Cleaned all carbs changed plugs runs great. Now only if we can get the shift cable adjusted to get reverse to work

ko4nrbs
07-01-2009, 09:53 AM
Buy some Seafoam at WalMart. It is in the automotive section. Remove the sparkplugs and squirt some in on top of the cylinders. Pour the rest in your 6 gallon gas can with the gas/oil mix. Let it soak in the cylinders for a few hours then run the rest through the engine. I do this once a year to decarbon my motors.
Do a search here on Decarbon to see more posts.
Bill