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 Post subject: What Venturi is used in the F-20 Carburetor?
PostPosted: Thu Jul 06, 2017 7:20 am 
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Joined: Mon Jul 03, 2017 9:37 pm
Posts: 6
What model of tractor is a #20 venturi for?

I have a couple of F-20 carburetors for parts that had #20's in them. However, my F-20 I am working on had a #18 in it.

According to my parts book, IHC used a #17 venturi up to serial #70111, then switch to the #18 venturi from there on.

Thanks!


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 Post subject: Re: What Venturi is used in the F-20 Carburetor?
PostPosted: Fri Jul 07, 2017 5:23 am 
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Iron Baron
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Joined: Fri Jan 26, 2007 6:41 pm
Posts: 6893
Location: Wellfleet Nebraska
Evan, were you at Des Moines? I never saw you. The 20 venturi fits F-30 for kerosene.

_________________
One can go into a wild country and make it tame,
but, like a coat & cap & mittens that he can never take off,
he must always carry the look of the land as it was.
He can drive his plow through the nigger-wool,
make fields and roads go every way, build him a fine house
and wear the stiff collar, and yet he will always look like the grass where
the buffalo have eaten and smell of the new ground he has trod.


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 Post subject: Re: What Venturi is used in the F-20 Carburetor?
PostPosted: Fri Jul 07, 2017 5:41 am 
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Joined: Mon Jul 03, 2017 9:37 pm
Posts: 6
Yes I was there. I am a member of the chapter who hosted it.

I saw your "H" and I even spotted you one time, but you were talking with a group of guys so I didn't want to interrupt you.

I have been dealing with my hard to crank-start F-20 for quite some time. I replaced the points and condensor at RPRU, but it didn't help. I completly went through the Mag and carb when I got it home. I bought 4 K-5 carbs at the show for parts, but I guess a couple of those came off F-30's! I assume that having some parts of the F-30 carb on my F-20 may be giving me problems?


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 Post subject: Re: What Venturi is used in the F-20 Carburetor?
PostPosted: Sat Jul 08, 2017 5:12 am 
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Iron Baron
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Joined: Fri Jan 26, 2007 6:41 pm
Posts: 6893
Location: Wellfleet Nebraska
Evan, do you have good hot spark at the plugs? I always sand the rotor disc in the mag while I have it apart. The brass piece is pretty thick so you can take enough off to get rid of the grove in the block. How are your plugs? Do they show a nice tan or gray color? If it runs good I doubt the carb is your problem. Timing is more critical. Timed a little late will start better.

_________________
One can go into a wild country and make it tame,
but, like a coat & cap & mittens that he can never take off,
he must always carry the look of the land as it was.
He can drive his plow through the nigger-wool,
make fields and roads go every way, build him a fine house
and wear the stiff collar, and yet he will always look like the grass where
the buffalo have eaten and smell of the new ground he has trod.


Image


Top
 Profile  
 
 Post subject: Re: What Venturi is used in the F-20 Carburetor?
PostPosted: Sat Jul 08, 2017 5:49 am 
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Joined: Mon Jul 03, 2017 9:37 pm
Posts: 6
The mag will put out a spark that jumps at least a quarter inch. The plugs were a good golden color, but I cleaned them and checked their gap. They have maybe 10 hours on them.

I lightly sanded the mag rotor like you said. Slightly retarded the mag to trip after DC (I checked my other easy starting F-20 and tried to match it). But I do worry that impulse disengages at a lower speed than the designed 225 RPM. I have 3 parts mags I inspected for their Impulse mechanisms. Mine didn't look worn very much. However I did bend the little spring so it would be a little tighter on the impulse catch.

Would you happen to have a E4A magneto coupling drive shaft? I would be able to replace my F-4 with the E4A Kirk rebuilt for me.

I appreciate the advice Howard.


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 Post subject: Re: What Venturi is used in the F-20 Carburetor?
PostPosted: Sat Jul 08, 2017 2:53 pm 
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Iron Baron
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Joined: Fri Jan 26, 2007 6:41 pm
Posts: 6893
Location: Wellfleet Nebraska
I probably have some short drive members but no couplers.

_________________
One can go into a wild country and make it tame,
but, like a coat & cap & mittens that he can never take off,
he must always carry the look of the land as it was.
He can drive his plow through the nigger-wool,
make fields and roads go every way, build him a fine house
and wear the stiff collar, and yet he will always look like the grass where
the buffalo have eaten and smell of the new ground he has trod.


Image


Top
 Profile  
 
 Post subject: Re: What Venturi is used in the F-20 Carburetor?
PostPosted: Sat Jul 08, 2017 4:52 pm 
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Joined: Mon Jul 03, 2017 9:37 pm
Posts: 6
I believe the short-drive member would be all I need to swap, because the coupling plate and adjustment screws are interchangable. Correct me if I'm wrong....

And to remove it from the governor drive shaft, simply remove one bolt and it should pull out? I read this on a YT forum.


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 Post subject: Re: What Venturi is used in the F-20 Carburetor?
PostPosted: Sun Jul 09, 2017 4:27 am 
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Iron Baron
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Joined: Fri Jan 26, 2007 6:41 pm
Posts: 6893
Location: Wellfleet Nebraska
yes, remove the nut and the piece will pull off. You may have to tap it a little but be careful. You can bend the drive shaft pounding on it.

_________________
One can go into a wild country and make it tame,
but, like a coat & cap & mittens that he can never take off,
he must always carry the look of the land as it was.
He can drive his plow through the nigger-wool,
make fields and roads go every way, build him a fine house
and wear the stiff collar, and yet he will always look like the grass where
the buffalo have eaten and smell of the new ground he has trod.


Image


Top
 Profile  
 
 Post subject: Re: What Venturi is used in the F-20 Carburetor?
PostPosted: Sun Jul 09, 2017 1:18 pm 
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Joined: Mon Jul 03, 2017 9:37 pm
Posts: 6
Thanks Howard,

Do you know where I could find one?


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