John. 150 1982 idle rough-jets

[Pluto]

I have try a lot and still the same, Changed sparks and wires, corrected fuel leaks, cleaned the carbs, syncro the carbs and still have a rough idle. The carbs has to screws on the side of the bowl for the jets orifices, when dissasemble, only the top screws had a small jet and nothing on the bottom one. After running the engine on idle I performed a spark plugs inspection and noticed a rich condition on them, I wonder if I'm missing the iddle jets on the carbs, where this jets are located, what are the jets numbers for runing at sea level? By leaning the carbs on the idle side would it improve? How do I do it? Any help would be apreciated.

 

[OBJ]

Re: John. 150 1982 idle rough-jets

Hi Pluto and welcome to the forum.....<br /><br />If I understand your post.....you are saying the top carbs are missing jets?<br /><br />Let me see if I can pinpoint the jets your talking about.<br /><br />Your 150 has three carbs. Top, Middle and Lower.<br /><br />On the sides of the float bowls there are screw plugs on both sides. Behind these lay the high speed jets.<br /><br />Are you saying that one or more of these jets are missing?

 

[Pluto]

Re: John. 150 1982 idle rough-jets

Thanks for the quick response, you got the right lay out. After a very close inspection we were able to find the high speed jet on the lower side screws of the bowl. I'm doing a carb rebuilt after soaking them into carb cleaning solution for about 1hr each and air preasure cleaning, of course new gaskets and float/neddle and seat. No jets are missing.<br /><br />I pretty much think that the rough iddle is due to a rich condition, the carb has a 32 jet for the air intake, the intermidiate are 27 and don't know the high but will not mees with them, the engine is runing fair at hight rpm. I would love to know if I need biger holes on the jets or smaller to go leaner, what size I need to go leaner on the iddle jets?<br /><br />This motor also has 6 little fittings on the reed cover just above of carbs that are connected to a rubber line to the side of each piston on the block, I asume this are for better lubrication since no VRO is installed. I read some place that if they are not funtioning right they can trigger rough idle conditions. I tested the check valve funtion that they should have and one is not closing well. I wonder were I can buy this little fittings to replace all?<br /><br />I'm also planning to use a de-carb solution to see if the problem is due to carbon built up.<br /><br />I will love any imput to resolve this iddle cought that is driving me crazy.<br /><br />Thnks in advance. Pluto