Running WAY too rich. |
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KooK
Senior Member Joined: February-10-2014 Location: Iowa Status: Offline Points: 143 |
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Posted: July-28-2016 at 11:34pm |
So I just did a leakdown on my 79 Mustang 17 (302 V4) and it came back that all of my cylinders are between 60-70% @ 100psi with 30-40% basically just getting past the rings. When I took my plugs out they were blacker than the night sky, so obviously I have an over-fueling issue. I was wondering if somebody could tell me if this is the correct carb for my boat, then we'll go from there.
Holley 4bbl |
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KooK
Senior Member Joined: February-10-2014 Location: Iowa Status: Offline Points: 143 |
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Thinking about it, I did have to idle in for quite some time the last time I came in... Probably a bad test of plugs unless I shut it off at WOT. Either way, kinda low leakdown.
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Jonny Quest
Grand Poobah Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2957 |
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When was your carb last re-built? Call Vince at www.skidim.com and he can get you the proper carb re-build kit. In your top picture you captured the the carb numbers stamped on the air horn. Before replacing the carb, I would try this option.
JQ |
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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Per the Holley manual:
List 7159 is a model #4160 450cfm rebuild kit #703-33 Google "d4jl f" several sites show that carb for a 302 |
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Keep it as original as YOU want it
1978 Mustang (modified) |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11061 |
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Just to add a little to what Duane said 302's came with a 450 CFM Holley and my Holley manual agrees with his. Also if you rebuild it, do yourself a favor and get some new bowl screws for the front float bowl cause those style are just terrible for a lack of any better words. You'll see why when you take them out The secondary bowl screws look like they've been replaced (they appear to be a hex head) but the front look original The front are longer than the rear so make sure you get the right ones. And 450 CFM is plenty for a stock 302 |
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