150 blackmax power loss

randymm

Recruit
Joined
Jun 4, 2004
Messages
1
I just bought an '87 merc blackmax 2 stroke 6 cylinder and it seemed to run fine.I just noticed as I'm cruising at 10 or 15 knts it will get sudden bursts of power.My buddy has a 90 hp and it does the same.Can anybody tell me what it is?
 

eurolarva

Rear Admiral
Joined
Jun 24, 2003
Messages
4,182
Re: 150 blackmax power loss

Sounds like the motor is racing. Could be that the needle valve is not getting a good seat in the carb. When you prime does the bulb get good and stiff without dripping gas out the carb?
 
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