82 Mercruiser 140 Hesitates and Bogs

[Dallmanator]

Re: 82 Mercruiser 140 Hesitates and Bogs

Kinda have the same problem but have discovered a few interesting things :

Have a 1991 Mercruiser 4cyl 3.0LX, or at least thats what my Mercruiser manual states. The pictures on the manual are pretty distinct, the LX intake manifold is much bigger than the L. However I just removed the carb to find the model number 9562-2 then below 1201. All the manuals that I have seen online state that the 9562 carb is for the L version of the 3.0, however the jets and power value have been changed to 1.55 and .84 respectively. This is the 36mm carb throat version and not the 43mm one. It would seem that the previous owner tried to up the jetts and the power valve to compensate for the smaller carb being on the LX. The carb internals seem quite clean and must have just been rebuilt.

My biggest question is should I rebuild this carb and re-install hoping that will fix my bogg problem, or is this the wrong carb for this engine?

Thanks!

D.

 

[apoc330]

Re: 82 Mercruiser 140 Hesitates and Bogs

Interesting new development. I took the boat out tonight to rule out bad fuel or dirty fuel tank so I ran on a brand new 6 gallon tank and had the same issue.

Here is the part that does not make any sense to me: When I accidentally put the boat into hard reverse meaning almost wide open the rpms climbed and the boat ran better going backwards than it does going forward The rpms actually went up to around 3000 with no surging, i guess I never noticed before because i am usually just easing it off the trailer. Am i looking at the wrong thing, could this be an issue with the drive or prop?

Hopefully this new development will help.