what size main jets for 1987 MCM 200

[rpuchowicz]

I am in the process of rebuilding a mercarb part#: 13899670 date code: 0Y03. It is off a 1987 Mercuiser 5.0.

If have consulted 2 different mercruiser manuals and 1 service bulletin and there are discrepancies among them.

I have 1987 MC shop manual #9 courtesy of Don S. I also found a newer MC shop manual that covers my carb at this link: http://www-alt.mercurymarine.com/mne.../17/17b5r2.pdf I have also found a 1999 service bulliten at: http://www.marineengine.com/discus/m..._08-248939.pdf

The 1987 manual from Don S calls for 170s, the newer manual calls for 165s, and the service bulletin calls for 185s. When I rebuilt it last season I put in 185s but it ran rich.

What size to I need??????????

Any help would be greatly appreciated. Thanks.

 

[Bondo]

Re: what size main jets for 1987 MCM 200

When I rebuilt it last season I put in 185s but it ran rich.

Ayuh,..... Probably Not the 185s......

I'd try the 175s,+ read the plugs....
165s might be Lean,+ induce Detonation....Or maybe they're Perfect,..?? The Plugs will tell you...