Carb Problem 351 Holley 4160 Flooding

[SugarLake]

Originally Posted by thatsmrmastercraft

The relationship between mixture screws and idle speed screw needs to be proper. If the mixture screws are in too far, you can make the carb idle on the main metering circuit - though not very nicely. As Cloaked said, start with the idle mixture screws 1 1/2 turns out and get you idle speed set properly.

If the diaphragm on your power valve (and it should be 2.5) is ruptured, it will run full rich and give you black smoke coming out the exhaust. The only true way to test it is to remove it and hold the outer diameter of it while trying to gently twist the pointy end. If it turns freely it is bad. By turning your mixture screws in all the way, the engine can still run if there is a significant base gasket leak.

Thanks. It's running good now and the mixture screws are responding. I don't honestly know what exactly fixed it but I'm not going to argue with success!

For those of you that have done rebuilds on this carb where did you set the float levels? Level seems way too high but I may have had some needle and seat issues too. I did find a generic guide in the link below but I would think the marine application would be a little different given the angle the engine sits at in the boat?

http://www.holley.com/data/TechServi...Carburetor.pdf

[thatsmrmastercraft]

There is a spec in the rebuild kit for measuring the distance between the float and the surface of the fuel bowl while inverted. Generically this laves the float surface level with the top of the fuel bowl while inverted, but there is a range of measurements (15/64"-1/2") by carb number. There is also a measurement for the secondary float that isn't always the same as the primary setting.

Holley 4160 carbs are a breeze to rebuild as long as you follow the instructions completely.

[SugarLake]

Originally Posted by thatsmrmastercraft

There is a spec in the rebuild kit for measuring the distance between the float and the surface of the fuel bowl while inverted. Generically this laves the float surface level with the top of the fuel bowl while inverted, but there is a range of measurements (15/64"-1/2") by carb number. There is also a measurement for the secondary float that isn't always the same as the primary setting.

Holley 4160 carbs are a breeze to rebuild as long as you follow the instructions completely.

That's what I need is that spec sheet, my rebuild kit instructions I got from the MC dealer didn't have one. It shows you where to measure but nothing on what the measurement should be. These are the instructions I have, which are also the only ones I can find on the Holley site.

http://www.holley.com/data/Products/...l/199R8339.pdf

[thatsmrmastercraft]

Originally Posted by SugarLake

That's what I need is that spec sheet, my rebuild kit instructions I got from the MC dealer didn't have one. It shows you where to measure but nothing on what the measurement should be. These are the instructions I have, which are also the only ones I can find on the Holley site.

http://www.holley.com/data/Products/...l/199R8339.pdf

Do you still have the packaging from your rebuild kit? I would be curious to see the numbers.

Here are the specs:

[SugarLake]

Thanks Mr. MC, that's exactly what I was looking for! But unfortunately the settings for the 80319 carb are blank.

My box is still up at the cabin, I can get the PN from it this weekend if your curious. It looked like an MC part though, plain white box. It wasn't a Holley 703-47.

I have an email in to Holley tech support, hopefully that solves the riddle.

[thatsmrmastercraft]

Originally Posted by SugarLake

Thanks Mr. MC, that's exactly what I was looking for! But unfortunately the settings for the 80319 carb are blank.

My box is still up at the cabin, I can get the PN from it this weekend if your curious. It looked like an MC part though, plain white box. It wasn't a Holley 703-47.

I have an email in to Holley tech support, hopefully that solves the riddle.

There aren't that many blank spots........go figure. They guys at Holly Tech will have the answer for you. Keep us posted.

[SugarLake]

Holley got back to me and said they should just be set level. Maybe that's what all the blanks mean in the spec sheet. But I'm pretty sure when I opened up my carb for the first time they were definitely lower than that and the carb was brand new last year.

[thatsmrmastercraft]

I have seen them come from the factory with incorrect settings once or twice.

[pbgbottle]

bump old thread i just rebuilt my 4160 also it has a blank for my carb # R50419-1
my floats weren't level either but they are now. also the rebuild kit came with the 6.5 power valve not the 2.5
it started and ran fine . but i will get it on the lake tuesday for test drive.

any update to your situation hows your carb working for you .

i used the holley rebuild kit 703-29


also the old needle and seats had different numbers on them primary had 97 secondary had 110 stamped on them .in the new rebuild kit both needle and seats are identical .

just curious why the changes ,my carb is from 88



...

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[pbgbottle]

I'm sitting on the lake now. Boat runs and idles fine. But when I give her fuel to go she bogs barfs out the top of the carb with a poof sound. And then goes it will stiffer and shudder for a bit and then smooth out. I too was wondering what the float level may be. Mine where not level either. Of it stalls super hard to start also full throttle and crank her over until it roars to life. This sucks. Carb work better befor rebuild. I only rebuilt it because it was 20 years old and leaking fuel out of the accelerator pump
And started to run ruff. I no I got it rebuilt right and cleaned. I check everything and had my mechanic buddy do the technical stuff. But he too was concerned about float levels wit the original settings being so different.
Anyways. I'll check it later when I limp it back home. Haha.


Lll