Tune up parts for 2000 4.3 Mercruiser

BRG25

Chief Petty Officer
Joined
Jul 13, 2001
Messages
528
At the end of last season my engine was stumbling slightly at WOT so I am going to do a full tune up. I am only going to use OEM parts.

Motor Serial# L642312 (0L642312)
Drive Serial# L722749 (0L722749)

809969 98 : 4.3 L/4.3 LH ALPHA/BRAVO (262 CID - GEN + ) -

So far I have looked up on Mercury Parts Express based on my engine serial number:

Cap 815407A 2
Rotor 13524A 6
Gasket 805760
Screw 90926 (probably don't need)
Sensor 892150Q02 (probably don't need)
Wires 816761Q16
Boots 63709A 1 (probably don't need)
Spark Plug 816336Q
Fuel Filter 802893Q01

The service manual lists these 3 spark plugs:

AC - MR43LTS
Champion - RS12YC
NGK - BPR6EFS

Which plugs do you guys like? Anything else I'm missing?
 

Bondo

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Staff member
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Apr 17, 2002
Messages
70,458
Re: Tune up parts for 2000 4.3 Mercruiser

Ayuh,... I run/ like the AC Delcos....

Btw,... Stumble at Wot is usually lack of Fuel...
 

BRG25

Chief Petty Officer
Joined
Jul 13, 2001
Messages
528
Re: Tune up parts for 2000 4.3 Mercruiser

I've been mooring my boat on the lake for the past few years and believe I may have some condensation in the tank. When it started stumbling last year, I changed the canister filter and added some ethanol treatment. We started doing this in our sleds over the winter and it has helped stabilize the gas though it doesn't do much for water. It's the standard 2 barrel Mercarb.
 

Bondo

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Staff member
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Apr 17, 2002
Messages
70,458
Re: Tune up parts for 2000 4.3 Mercruiser

Ayuh,... If new filters fix it, that's fine...
If not, you'll probably have to rebuild the carb...
 

BRG25

Chief Petty Officer
Joined
Jul 13, 2001
Messages
528
Re: Tune up parts for 2000 4.3 Mercruiser

Right thanks.
 
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