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What should the compression be for a 50 hp 4 stroke Mercury outboard motor?
125 is the least
What should the compression be at on a 150 hp mercury outboard motor?
I should be equal on all cylenders and about 110 to 120
What is the cylinder compression for a 1999 135hp mercury outboard?
should be at least 100 PSI and the difference between cylinders should be less than 10% of each
What is the cylinder compression for a 2003 90 hp mercury outboard?
I have a 2005 and compression should be close to 120 psi. Normally a good engine will have compression between 115 and 130 psi but a leak down test should be performed also to know the full condition of a cylinder.
Hi you have an older ted Williams 7.5 horse outboard engine and you need to know what the compression should be or close to be?
A 7.5 hp outboard will need around 90 - 100 psi of compression to start up and run. Anything over this pressure is a bonus. Also, you want there to be no more than 10 - 15 psi difference between cylinders.
What should the spark plug gap be in a Mercury 110 9.8 outboard?
.040
What should the normal compression be on a 1997 Johnson 15 hp outboard motor?
between 90-120
What is the weight of a mercury 9.8 hp outboard?
Should be right around 65 pounds
What is the proper points gap on a 1970 9.8 Mercury?
The maker points on a 9.8 hp Mercury outboard should be set to .020 in.
What should the compression be on a 1978 80 hp mercury outboard?
Back in 1978, an 80 hp Merc had compression in the 180psi range, so a high octane fuel is required. Basicly, if your readings are at least in the 110 - 120 psi range, and no more than 10 - 15 psi variance between the highest and lowest reading, you should be okay.
Cylinder compression on a 1996 mercury 175 outboard motor?
It should be some were between 120 to 125 on all 6. That would be on a motor in good condition. 115 to 120 is not bad. Just make sure they are witnin 20percent of one another.
What is the torque on a 30 hp mercury outboard head bolts?
Your Repair manual should contain that information.
