Carb Confusion!!

[ratlsnaktj]

After a long process of tracing my problem to the carbs, i just got around to pulling them off my '83 V150. I was expecting to find the mounting flanges stamped with 1382-7563 or 1374-5643 that the parts diagrams show as being the carbs on my engine. What I pulled off are stamped 1374-5427. All 3 carbs are that item number. So now I'm in somewhat of a panic mode. Since all 3 carbs match each other, despite not being the ones matching the parts listed on the diagrams should I be concerned? My plan was to rebuild the ones I took off, but now I don't know what to do. I know someone will likely ask for the WH #....where can I find that?

 

[j_martin]

Re: Carb Confusion!!

After a long process of tracing my problem to the carbs, i just got around to pulling them off my '83 V150. I was expecting to find the mounting flanges stamped with 1382-7563 or 1374-5643 that the parts diagrams show as being the carbs on my engine. What I pulled off are stamped 1374-5427. All 3 carbs are that item number. So now I'm in somewhat of a panic mode. Since all 3 carbs match each other, despite not being the ones matching the parts listed on the diagrams should I be concerned? My plan was to rebuild the ones I took off, but now I don't know what to do. I know someone will likely ask for the WH #....where can I find that?

You got that one right.

The WH number is likely imbeded in another number on the carb. I think on the early ones they were on the mounting flange, but don't hold me to that.

Should be somewhere between a 1 and a 40.

BTW, there's a guy goes by T-rex (and is almost that ugly) on Screamandfly.com that could probably tell you what it is from and how to set it up once you find the WH number.

Do the carbs have idle adjusting screws on them?

hope it helps
John
hope it helps
John.

 

[j_martin]

Re: Carb Confusion!!

I think they're WH-3's 200 HP

Stock 78 mains, 46 or 44 idle jets, 84 or none vent jets.

Are you having trouble getting it to idle? Should breath easy once it's running some rpm's.

 

[ratlsnaktj]

Re: Carb Confusion!!

Thanks for the reply. The problem has been getting them to run at higher RPMs, it idles just fine, maybe a little flat sounding. The motor was not getting above about 1500 rpm before sputtering out. The reason I am going the rebuild route is that when I push the choke in right as it sputters it would stay running, a mechanic at my marina told me to go this way.

The only number I was seeing on the mounting flange was the part number, I'll have to check again to be certain. It does have idle adjusting screws on it I believe. Do I need to get my hands on the correct carb models or can I just swap the jets?

One other thing....when I took off the choke plate, the gasket between it and the front side of the carbs had a complete tear through it on one side. It was on the left side of the gasket, lined up nearly dead center of where middle carb throat would be. I'm thinking that a loss of vacuum may have been causing this problem to begin with, not necessarily a fouled or worn carb.

 

[j_martin]

Re: Carb Confusion!!

Shouldn't be any vacuum there to lose, unless you're choking it. Would affect starting but not running.

Gasket between carb and reed plate, and between reed plate and front half are both critical, but would cause much trouble at idle.

If it is a WH carb, it don't have idle adjustment screws.

Check the jet sizes. They vary a large amount between different very similar looking WH carbs. If this trouble came to you, maybe someone put the wrong jets in them. The jet sizes depend on carb model more than application. Extreme porting, or compression changes are needed to have to mess with the carbs.

Another thing that happens if that folks will fuddle up the carbs trying to drill passages to get them to run E85, then give up. Unscrupulous ones will sell them on E-bay.

If it ran right for you once, you may just have plugged up carbs. (or fuel pump, or fuel filter, or bayonet fitting............yawn)

hope it helps
John

 

[ratlsnaktj]

Re: Carb Confusion!!

Ok thanks. These are the ones that came on the engine. I blew one engine (has twins) on this boat last year and this is the replacement motor. Within a few weeks of it being put on I started having this same problem. The that hung the engine took one of the carbs and cleaned it, it ran fine for about 2 weeks. I know its not the filter because the other engine is also drawing fuel from the same filter. Squeezing the primer ball as it started sputtering did nothing either, so I'm banking on the carbs rather then fuel pump as well. I'm going to stay the course of rebuilding these, and I'm also planning on installing inline fuel filters in addition to the racor I already have installed. I hadnt thought to check the bayonet, but i will do that too. Thanks again for your help.