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  2 Clyinders not firing on 4 Cylinder Mercury 80 Hrs pwr

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Author Topic:   2 Clyinders not firing on 4 Cylinder Mercury 80 Hrs pwr
gatorufchamp posted 06-08-2003 10:27 PM ET (US)   Profile for gatorufchamp   Send Email to gatorufchamp  
The 80 horse power boat runs, but the top speed is like 7.5 mph because the power isn't there even at full throttle. It's not the plugs, and I know just 1 and 2 are firing, not 3 and 4? Anyone know what to do possibly?
JBCornwell posted 06-08-2003 11:48 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Very common problem, Gator.

Go to and look up power loss.

Good advice there. You will be back in shape in no time.

P.S. I'm betting on a gummed carb.

Red sky at night. . .

JBCornwell posted 06-08-2003 11:50 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
OOps! try:

gatorufchamp posted 06-09-2003 12:03 AM ET (US)     Profile for gatorufchamp  Send Email to gatorufchamp     
Thanks JB I appreciate it a lot. I'll go to that website
captainmorgan2 posted 06-13-2003 02:34 PM ET (US)     Profile for captainmorgan2  Send Email to captainmorgan2     
you have blown the powerhead. this common with mercury's. is it the black max era. 1988-1997 they really sucked. poor design. has the engine ever overheated befroe? trade the engine in for a 4 cylinder 90 from bombardier or by a honda,suzuki,or yamaha. never by mercury they are a piece
lhg posted 06-13-2003 03:22 PM ET (US)     Profile for lhg    
Looks like we've picked up another nut.
bsmotril posted 06-16-2003 11:33 AM ET (US)     Profile for bsmotril  Send Email to bsmotril     
I agree with LHG. Might want to try replacing a powerpack or cleaning one of the carbs before forking over $2K for a new powerhead.

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