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#1
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Mercury 470 - carb woes (too much fuel)
I've got a 1978 mercury 470 i/o (170hp 4 cylinder) with what I think
is the Rocheseter 2bbl carb. It was loading up on fuel after running for a wee bit. I've adjusted the float but now I suspect it's too lean. (Drag) I'd like to get a book to get this "just right" but I'm also looking for any tips from someone who has worked with this type of carb. Suggestions on how to tune this carb? Bill |
#2
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You need to set the float to the specified height. I have not worked on
that specific carb but you do not adjust the mixture ratio with the float level on any carb. If it is running too rich then you can change the main jets. First you should make sure that the carb is otherwise working correctly. Normally carbs are pretty close to the right mixture to start with. Suddenly having too much fuel suggests a problem, not an adjustment. "Bill York" wrote in message om... I've got a 1978 mercury 470 i/o (170hp 4 cylinder) with what I think is the Rocheseter 2bbl carb. It was loading up on fuel after running for a wee bit. I've adjusted the float but now I suspect it's too lean. (Drag) I'd like to get a book to get this "just right" but I'm also looking for any tips from someone who has worked with this type of carb. Suggestions on how to tune this carb? Bill |
#3
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James is correct. While you are resetting the float to specs, check it
carefully and be sure it hasn't any pinholes in it allowing gas inside. (if its the hollow brass type). Replace the needle and seat. Because it looks good doesn't mean it is. -- Bill Chesapeake, Va "JamesgangNC" wrote in message k.net... You need to set the float to the specified height. I have not worked on that specific carb but you do not adjust the mixture ratio with the float level on any carb. If it is running too rich then you can change the main jets. First you should make sure that the carb is otherwise working correctly. Normally carbs are pretty close to the right mixture to start with. Suddenly having too much fuel suggests a problem, not an adjustment. "Bill York" wrote in message om... I've got a 1978 mercury 470 i/o (170hp 4 cylinder) with what I think is the Rocheseter 2bbl carb. It was loading up on fuel after running for a wee bit. I've adjusted the float but now I suspect it's too lean. (Drag) I'd like to get a book to get this "just right" but I'm also looking for any tips from someone who has worked with this type of carb. Suggestions on how to tune this carb? Bill |
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