135 blackmax doesnt run right

squirrelmaster

Recruit
Joined
Nov 1, 2011
Messages
1
Hi, I just purchased a boat with a 1991 blackmax 135. The starter stuck on for the previous owner and fried some wiring and components. the main engine wiring harness, the starter solenoid, the mercury switch, and the rectifier have been replaced. the idle stabilizer has been removed. the engine will start and run very rough after a few starts to warm it up. it does not run consistently. any suggestions would be appreciated!
 

aussieflash

Lieutenant Junior Grade
Joined
Feb 5, 2011
Messages
1,004
Re: 135 blackmax doesnt run right

Could be a thousand things.So start with checking spark on all cylinders,then check compression and inspect plug ends while doing compression.You will need a merc service manual.
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,589
Re: 135 blackmax doesnt run right

Check the basics first: Compression,Ignition and Fuel.
 
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