Carb Model number / WH number help??

[DamianJP]

I have a 89' Merc 150 XR4 and was looking for WH 41 Carbs because I have WH 27's and want to have all right stuff for my baby. The guy said they are 41's, and that the number reads "41-10068" but no WH letters. Just want to make sure they are 41's before I dish out the $. Can anyone shed some light on the subject please. Also it is coming with the intake manifold and reeds. Can I just put the 41 carbs on my Intake/reeds that are on the boat or do I need to swap out the intake/reeds that come with the 41's. Basiclly do the carbs need to match certain reeds? Sorry some of this is problly easy for you guys on here, but the only way I'm going to learn is to ask questions.


Thanks,
Damian

 

[achris]

Re: Carb Model number / WH number help??

We have a problem... The carbs you have, WH-27, where used up to 1988... And there is no such carb as a WH-41...

If you can post your engine serial number I can look it up and probably tell you exactly which carb should be there.

Chris.........

 

[DamianJP]

Re: Carb Model number / WH number help??

Heres the serial 'aChris' 0B289510

Kinda of confused now, lemme know whatcha find.


Thanks,
Damian

 

[achris]

Re: Carb Model number / WH number help??

That serial number comes up as a 1988.... The carbs are being a little more difficult to pin down. All I'm getting is a part number for the carbs, not a WH number. The part number for the carbs are as follow:

Top : 3307-9671A1
Centre: 3307-9671A2
Bottom: 3307-9671A3

I've even tried to cross reference the jet sizes to the carb chart in the service manual... no luck....

As I said in the earlier post, there isn't a WH-41, and there is a WH-27. You may well already have the right carbs. Another path would be to list the jet sizes (main, idle and vent) and I can check those against the chart. If you do that you will need to check all jets in all carbs. They can vary according to the cylinder!

The WH-27 should be running 0.064 for mains, 0.054 for idles and no vent jets in place.

Chris..........

 

[DamianJP]

Re: Carb Model number / WH number help??

Hey, aChris

Iv'e found a chart/repair kits for XR4 (http://www.saveonboating.com/mercury-mariner-carburetor-kits.asp), but they say WH-41 or WH-41a 88-1990. BTW what does the added "A" mean?


Also back when I first got the 'rig' , couldn't hold an Idle / fouling&wet plugs. So I changed the idle's to .054 and Bam purring like a kitten. I think the Main's are all .074 but the Mercury dude said the jump from .074 and .064 aren't enuff to throw it off and unless I'm racing the engine, he didn't want to take my money for nothing. Still I'm gonna get the right main jets when I get home for 30$ for all 6 , just to see. Lemme know what ya dig up & nice rig too.


Thanks again,
Damian

 

[DamianJP]

Re: Carb Model number / WH number help??

Hey, aChris

Iv'e found a chart/repair kits for XR4 http://www.saveonboating.com/mercury-mariner-carburetor-kits.asp , but they say WH-41 or WH-41a 88-1990. BTW what does the added "A" mean?


Also back when I first got the 'rig' , couldn't hold an Idle / fouling&wet plugs. So I changed the idle's to .054 and Bam purring like a kitten. I think the Main's are all .074 but the Mercury dude said the jump from .074 and .064 aren't enuff to throw it off and unless I'm racing the engine, he didn't want to take my money for nothing. Still I'm gonna get the right main jets when I get home for 30$ for all 6 , just to see. Lemme know what ya dig up & nice rig too.


Thanks again,
Damian

 

[achris]

Re: Carb Model number / WH number help??

I'll do some research, and get some sleep... and get back to you... I may also go fishing tomorrow...

Chris.......

 

[DamianJP]

Re: Carb Model number / WH number help??

Hi again


Okay forgot time diff. Plus tight lines & good luck on the fishing note
Sorry for double post must have been not logged in, then when I did it posted two. Anyways thanks again, see ya in a couple of days or sooner. I'm sure we'll figure it out.


Thanks,
Damian

 

[j_martin]

Re: Carb Model number / WH number help??

Damian, don't change the main jets to .064 unless you're into major engine repair for grins and giggles.

The stock carb on an 88 XR4 is a WH41. Main jet is .074, Idle is .052, Vent jets are .076.

The A version is the same carb with richer idle jets, .048

The main jet meters fuel, smaller is leaner. .064 will run it so lean it'll burn. Sometimes we'll go down .002 if we want to push the limit, but never .010

The Idle jets are air metering jets, so smaller is richer. .052 is about right for a boat that gets off pretty well at takeoff. Go a little richer if it bogs at takeoff for lack of fuel.

My book says WH41 or WH41A for XR4 and Mariner MagII engines. I own an XR4, and it has WH41 carbs just like it says.

I would totally ignore Achris if I were you.

hope it helps
John

 

[achris]

Re: Carb Model number / WH number help??

...........

I would totally ignore Achris if I were you.

Not really sure if I like this....

Anyway, I'm using the Merc manual for that engine, 90-97658-3 and that manual does not list a WH-41. I'm also using the Merc parts catalogue, which doesn't list the WH number for the carbs on the XR4, just the part number for re-ordering.

You have already stated that you have WH-27 carbs on the engine. I gave you the jet sizes for those carbs.

We need to establish exactly what engine you have. The serial number you gave is for an XR4, but the carbs are not. Where did you read the number from? If it was the transom bracket, that's ok, that's where most people read it. There should also be a serial number stamped on the engine itself. Either on the top of the powerhead or on a small (about 1" diameter) aluminium disc on the lower part of the power head. Find that and see if it's the same number.

The WH-27 carbs are used on the standard 150hp, not the XR4.

Chris.............

 

[j_martin]

Re: Carb Model number / WH number help??

Here's a WH-41 carb, Off'n a 1988 XR4 bone stock.

Achris, do you have the latest version of the service manual. The same manual was used for v6's earlier than the XR4, and revised for the XR4. Mine is one back and leaves some things out.

John