Re: Merc 150 xr2 1985
I am going to be rebuilding my carbs on my 150 merc outboard, wm 29-1, 29-2, 29-3. I have a merc repair manual from merc but the info in the book is really limited. I have also an exploded diagram of my carbs, but it shows that in the merc book their are some jets in the front of my carbs but my carbs do not have them. The openings are their but not one has a jet in them. Now the exploded diagram I have is showing a screw or maybe a jet but it has no legend attached with it just the picture. Has any one rebuilt these carbs before and is there anything that needs to be addressed when pulling them a part besides keeping each carb seperate from one another.
It might help to get the nomenclature right. Those are WH29 carbs. The jet you are referring to is the vent jet, not the idle jet.
They do not have idle adjustments, only fixed jets. On the WH29, the vent jets are omitted. (none) Stock mains are .064, Stock Idle are .056, no vents.
Your most likely failure is that they would have foam floats in them, and they sink in todays stinking gas. Replacement floats are NLA, so you go find a set of WH carbs off any v6, 1988 or later, and get the hard plastic floats out of them.
They are simple to work on. Needles are probably good. Pay attention to float level, it's pretty critical. Use new gaskets, and evenly tighten down the bowl in several steps when you put them on, and you should be good to go.
hope it helps
John
