1955 Fastwin Carburetor question

[SeaKaye12]

Hi,

I've gotten my 1955 Fastwin 15HP running pretty well...but I still think I need to do better. The PO rebuilt the carb and I have found a couple of things that he did wrong so I keep delving deeper. I notice on the parts diagram that there is a washer (Part #78) that sets behind the 2 packing rings on the slow speed needle. My engine has no such washer.

My question is then: What type of washer is this? Brass? Fiber? It looks so much larger in the illustration compared to the packing...but it actually is the same diameter so as to fit down in on top of the packing?

Does it need to be there? Obviously it serves a purpose but I do notice that the carb pictured on the 7.5 HP motors don't show the washer.

I think that the slow-speed needle area of these carbs is the trickiest part to get right. Removing the old packing without getting pieces of it down by the seat can be challenging....I can see why some of posters here just leave them in and add a third....

Thanks, Chuck

 

[kfa4303]

Re: 1955 Fastwin Carburetor question

Hi SeaKaye12. That piece is usually made out of a black, plastic-like material on my 60's era motors. It should be a bit more rigid and made from a different material from the regular packing, if not necessarily larger. These links may help.

http://www.duckworksmagazine.com/07/columns/max/index1.htm

http://www.outboard-boat-motor-repa...hnson 5.5 HP 1954-1964 Carburetor Tune-UP.htm

 

[F_R]

Re: 1955 Fastwin Carburetor question

Nah, that part doesn't go where it seems on the picture. It is a large, soft rubber washer that goes right under the hex on the packing nut---outside the silencer. It's only job is to block the big hole in the silencer. You will never know the difference if it is missing.

 

[HighTrim]

Re: 1955 Fastwin Carburetor question

That washer fits over the packing nut, it is not an internal washer. It is quite bigger. The ID of it fits over the OD of the packing nut.

They are usually missing.

EDIT: Sorry started typing, my phone rang while typing mid sentence and Frank beat me to it

 

[SeaKaye12]

Re: 1955 Fastwin Carburetor question

Ah; thanks guys....that makes sense now. I had seen this picture and thought that it might have been similar:

 

[HighTrim]

Re: 1955 Fastwin Carburetor question

Thats her

 

[kfa4303]

Re: 1955 Fastwin Carburetor question

funky. never seen one of those. carb looks nice and clean though.