Hello all,
Ski buddy wanted to run some gas through his boat, so we put his boat on my lift for some free skiing before we get the courses up. It's an '87 MC with stock Holley carb. Runs great while skiing. At idle can smell gas and it's lumpy/surges on n off about twice per second though never dies. If we turn the idle set screw up to higher rpm it's runs smooth but too many rpm's for a nice engagement of forward/reverse from neutral.
I know zippo about carbs. Any easy adjustments for someone that knows virtually nothing?
THX
Dave Ross--die cancer die
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AND just remembered i had this site saved as well, a bit of reading but very helpful www.bob2000.com/carb.htm
@6balls I would just pull the carb and go through it. They are pretty simple animals and a rebuild is easy as long as you have the right kit and match up the right gaskets. Usually all you need is the number off the choke housing as a reference and a good parts store cans get you a kit. You will have to pull the flame arrestor to get the number, it's on the front of the choke housing above the front float bowl.
Thanks for all of the responses, Ballers.
Idle screw adjustment second. Run them all the way to seat (carefully, while counting turns) and back them out 1.5 turns. That's usually a good starting point. Remember that you want them both adjusted the same amount so if you turn them, turn them both the same.
@fast351 could you be more specific on where you are spraying the carb cleaner (base of the carb)?
Basically you have a square baseplate where the carb bolts to the intake manifold. Those gaskets dry out and crack, especially when you only run it a couple times a year.
Another one is vacuum lines, especially big ones. Not sure what that model year of boat would have on it, but cars of that vintage would have a brake booster that took a large vacuum hose. Unplugging them one at a time, and then holding your finger over it is a good way to check these.
Since it ran fine in seasons past, I'm guessing vacuum leak rather than a carb that fell out of adjustment...but no reason not to try the idle mix screws can always put 'em back where they were.
All the comments about the floats are spot on. I would guess that the needle and seats for the floats need to be replaced.