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#11
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Try coming down slow to burn off the gas in the carbs, when just coming down fast the un-used gas will flood and stall the motor.
Also might need some carb work but that should help, it did for me back in the day on my 75
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1986 V20  Old Fishermen never die, we just SMELL that way!! 
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#13
06-23-2010, 05:16 PM
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I would definately change to a 4" heat exchanger if possible. After I rebuilt my 170 it ran a little warm, about 170-180 while up on plane. I bored it .040 over, so the cylinder walls are a little thinner and it has a little more compression which will cause it ta run a little warmer. I replaced the entire water pump and it cooled down a little. After I got it broke in I changed the oil with 40wt. motor oil and added a quart of LUCUS OIL STABILIZER and my oil pressure rose 20 psi and it really cooled on down. Now it rarely gets above 165 degrees. The engine temp depends on the raw water temperature also! Try the Lucus oil stabilizer, its really great stuff!
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 77 V20 cuddy with 170 I/O Mercruiser 72 16ft. Carolina w/a 25hp Evinrude
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| Tags |
| impeller, mercruiser 470, temperature |
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