2004 9.9 mercury half power

[kenrahe]

i checked compression have 120 psi in both cylinders top cylinder fired for a little bit after compression check then quit again is this a carburator problem

 

[Bifflefan]

Re: 2004 9.9 mercury half power

You should have spark even if the carb is off the engine. look for what ever makes the spark and start there. your manual should have a trouble shooting guide with the proper steps to track this down. then replace the bad part and your rockin again.

 

[kenrahe]

Re: 2004 9.9 mercury half power

i did,nt take off the carb wondering why i have spark good compression but top cylinder still not firing

 

[MrGrey1]

Re: 2004 9.9 mercury half power

I just had the same problem and its solved now. Read my "Half Power" posts from yesterday. My merc 9.8 ran slow on half power (Just like a one cylinder) and would not speed up.. I have checked the coils and I thought one was faulty. But it was not the case. I had to return that part and replaced with the black black "Pulse Regulator Box" before the coils that was shorted out.

Yes, I've purchased a new one today, replaced it and all is well now. Puuuurrrrs like a kitten! That is most likely what you need to do. However, it costs about $300.00 bucks!

You can email me your engine picture (with coils view) and can tell you if it looks similar to mine..
Good luck, MrGrey1