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#12350879 - 07/20/17 10:06 PM Mercury Blackmax Carbs - pickup tubes
CraZyNOTRT Offline

Registered: 01/04/13
Posts: 83
Loc: McKinney, Tx
I bought some cheap chinesium rebuild kits off of ebay a few months back due to carb related problems (not a bad kits for the most part). The pickup/emulsion brass tubes were clogged so I replaced them. But the cheap Chinese tubes were poorly machined (all openings on the tubes were ruff/jagged and different sizes) and put them in cause the old ones were too clogged to clean. They fixed the problems I was having, but created a new issue that is starting to annoy me.

Any ways, I have some new OEM rebuild kits coming in next week for My 1984 Mercury Blackmax 150 / WH-29 carbs. The kits come with 2 different sizes pickup/emulsion tubes 0.023 and 0.028? I believe 0.023 is stock.

Should I stick with stock size or put in the bigger sized tubes in?
If the larger tubes are put in, what would happen? IE... running rich/lean/flooding/more power/nothing

Edited by CraZyNOTRT (07/20/17 10:08 PM)

#12351445 - 07/21/17 10:10 AM Re: Mercury Blackmax Carbs - pickup tubes [Re: CraZyNOTRT]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11468
Loc: Littlefield Tx & Lake A. H. US...
I had the same motor on a 1984 350v Ranger and I put a set of XR6 carbs on it. Worked great with the idle air adjustment. There is a chart showing stock sizes for everything on your carbs. Should be able to find in a search.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD

#12351590 - 07/21/17 11:28 AM Re: Mercury Blackmax Carbs - pickup tubes [Re: CraZyNOTRT]
Muzzlebrake Offline
Extreme Angler

Registered: 12/26/14
Posts: 1664
Loc: Euless
Don't know if boat motors are same as Motorcycle engines but the bigger hole(s)on emulsion tube gives a richer mixture at idle and just off idle thru midrange.
From Genesis: "And God promised men that good and obedient wives would be found in all corners of the earth."

Then He made the earth round...and He laughed and laughed and laughed!

#12351807 - 07/21/17 01:17 PM Re: Mercury Blackmax Carbs - pickup tubes [Re: CraZyNOTRT]
TLW Offline
Extreme Angler

Registered: 11/16/06
Posts: 2356
Loc: ft worth


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