1977 Mercury 1150 115hp outboard more help please!!!!!!!!

[johnrondeau]

now my problem is cyl 3/4 are not firing maybe to much gas or no spark or out of time i do not no i am also having a hard time timeing the motor because i need a dial indicator that i can not find i do have a timing light but need a dial indicator please let me know if you have any better ways to time the motor or if you know where to find a dial indicator
also my top carb letting out to much gas just got a new float for it and still to much gas

 

[Sunfish12]

Re: 1977 Mercury 1150 115hp outboard more help please!!!!!!!!

You need a spark tester to see if it's a spark issue. Is the top carb dumping fuel out of the air intake side? Compression test?

 

[steelespike]

Re: 1977 Mercury 1150 115hp outboard more help please!!!!!!!!

There are many dial indicators on ebay You might try Johns Old Mercury web site for timing instructions.

 

[Chris1956]

Re: 1977 Mercury 1150 115hp outboard more help please!!!!!!!!

John, Dial indicators are nice, but not essential. I use a caliper, but a small accurate ruler is OK as well.

Set the top cylinder to TDC using a screwdriver. Now use a small ruler measure thru plug hole, the depth of piston. Now add .464 inches to that measurement and back the piston (CCW) down until the ruler measures correctly. Now set the timing pointer to read .464 on the timing decal. Now make your timing adjustments.