All-Terrain Lawn Tractor Forum

Like riding lawn tractors through mud, woods, rocks, and snow? Then this is the place for you! Share your ideas, Post your projects and more!
 
Carburetor Swap Lend10PortalHomeFAQSearchMemberlistRegisterLog inDiscordCountdown TimerCarburetor Swap Rend10
Welcome to the All Terrain Lawn Tractor Forum!
2019 Build Off Underway!

Share
 

 Carburetor Swap

Go down 
AuthorMessage
akcender
Forum Newbie
Forum Newbie
akcender

Age : 23
Join date : 2011-12-04
Posts : 46
Forum Rep : 0
Location : Toronto, Ontario, Canada

Carburetor Swap Empty
PostSubject: Carburetor Swap   Carburetor Swap Icon_minitimeSat Aug 24, 2013 5:11 pm

Has anyone put a carb on an engine that was originally off of another completely different engine? What im hoping to do is put a honda gx style carb on my tractor.
Back to top Go down
Doug
Administrator
Administrator
Doug

Age : 24
Join date : 2012-12-24
Posts : 2891
Forum Rep : 48
Location : Lebanon County, PA

Carburetor Swap Empty
PostSubject: Re: Carburetor Swap   Carburetor Swap Icon_minitimeSat Aug 24, 2013 5:15 pm

It depends. What GX model is it coming off from and what engine is it going on? Why is it going onto a different engine? I know people have used snowmobile carbs on small engines before.

_______________________________________________
Head Forum Administrator ** Chat Moderator ** Facebook Page Admin
ATLTF Facebook Page ** Chatbox ** How To Upload Pictures

_X_ FORUM ANNOUNCEMENTS _X_


Have a question? Ask me! Type in "@Doug" in your post!

Your ATLTF Staff:
Administrators: @Doug, @MightyRaze, @"Doc Sprocket", @Stretch44875
Moderators: @TheRainbowBoxer, @AllisKidD21




Back to top Go down
akcender
Forum Newbie
Forum Newbie
akcender

Age : 23
Join date : 2011-12-04
Posts : 46
Forum Rep : 0
Location : Toronto, Ontario, Canada

Carburetor Swap Empty
PostSubject: Re: Carburetor Swap   Carburetor Swap Icon_minitimeSat Aug 24, 2013 5:22 pm

Doug Fackler wrote:
It depends. What GX model is it coming off from and what engine is it going on? Why is it going onto a different engine? I know people have used snowmobile carbs on small engines before.
Its off a 6.5 hp honda clone motor. Itll be going on an 11hp briggs I/C. After typing that out im realizing that it probably wont work because of the HP difference. I need a temporary carb for this engine while i wait for the carb kit to come in.
Back to top Go down
Guest
Guest



Carburetor Swap Empty
PostSubject: Re: Carburetor Swap   Carburetor Swap Icon_minitimeSat Aug 24, 2013 5:42 pm

wouldnt work. It would however work on a tecumseh of that range (oddly) but you'd have to run it nearly full-choke to make it work.

Either way, the briggs has a different mount pattern.
Back to top Go down
crazykid1994
Veteran
Veteran
crazykid1994

Age : 24
Join date : 2013-03-18
Posts : 618
Forum Rep : 0
Location : loxahatchee, florida

Carburetor Swap Empty
PostSubject: Re: Carburetor Swap   Carburetor Swap Icon_minitimeSat Aug 24, 2013 5:51 pm

You can run bigger hp engine carbs on smaller hp engines. It just runs funny sometimes depending on the difference. I ran a 17.5 hp on a 12.5 hp without a problem and gained some power
Back to top Go down
tman9114100
Forum Newbie
Forum Newbie
tman9114100

Join date : 2013-03-17
Posts : 45
Forum Rep : 0
Location : LaCrosse, WI

Carburetor Swap Empty
PostSubject: what about   Carburetor Swap Icon_minitimeSat Aug 24, 2013 10:10 pm

could u put an atv carb on a 12hp briggs and stratton? or if i was going to put a bigger carb on, how much bigger hp would i have to take it off of or buy it for to gain extra power?
Back to top Go down
crazykid1994
Veteran
Veteran
crazykid1994

Age : 24
Join date : 2013-03-18
Posts : 618
Forum Rep : 0
Location : loxahatchee, florida

Carburetor Swap Empty
PostSubject: Re: Carburetor Swap   Carburetor Swap Icon_minitimeSat Aug 24, 2013 10:37 pm

I couldn't tell you. You could if you could make a adapter. But im sire there's a point whenever its not worth it. Maybe a few hp bigger because all it does is allow more airflow into the engine for a better burn
Back to top Go down
Doc Sprocket
Administrator
Administrator
Doc Sprocket

Age : 46
Join date : 2013-04-21
Posts : 2911
Forum Rep : 19
Location : Ontario Canada

Carburetor Swap Empty
PostSubject: Re: Carburetor Swap   Carburetor Swap Icon_minitimeTue Aug 27, 2013 10:22 am

There is a fair amount of things to consider when attempting such a carb swap. Some points to consider-

1)Too big is just as bad as too small. A carb that is too large will not have a sufficient venturi effect, and won't create enough vacuum to draw the fuel in properly. Too lean no matter what you do.

2)Mounting- Unless the carb came off a very similar engine, the mounting studs will be spaced differently, and often, not even level. You'd have to fab an adaptor, and if what you make is not perfectly airtight, it will never run right.

3)Governor- If your engine is still governed, and you swap to a completely different carb, your governor will NOT work. This will result in you having to completely rework the throttle mechanism, and (best bet) open the engine to remove the governor's internals.

4)Jetting- Unless the replacement carb is coming off a pretty much identical engine, it's a safe bet that the jetting will be way off. Depending on carb design, it can be QUITE a challenging process to get the carb tuned to the engine. More often than not, this process can also necessitate the purchase of additional jet needles, needle jets, main jets, idle jets, and sometimes slides.

So- Is this a good idea? No- Not as a temporary solution. Swapping carbs is a commitment, that will require more time/effort/money than you'd want to put into a "temporary" solution while you await parts. And, done wrong, your engine will run like crap, if at all. Been there, done that...

And FWIW- a bigger/better carb will NOT make more power. At best, it will improve throttle response, allow smoother running, better transitions. There IS such thing as too big. A proper mixture is a proper mixture. Thanks to the venturi effect, too big will NOT inprove airflow for a better burn or whatever, and can actually kill fuel delivery.

_______________________________________________
***Get YOUR official "Doc Locked, And Ready To Rock!" Stickers by clicking here!***
***Official Sprocket's Garage vinyl graphics and tees for sale HERE!***
Carburetor Swap Facebo12
Put down the wrench, and come out with your hands up!-Doc "Tranny Crusher" Sprocket, ATLTF Forum Admin, Thinkerer and Tinkerer, and all-around good dood. Wink

Gen. Mayhem- http://www.atltf.com/t2597-general-mayhem-race-tractor
MULE- http://www.atltf.com/t2153-lawn-boy-utltv
MULEII- http://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
MULEIII http://www.atltf.com/t4263-mule3-brainstorming-ideas-etc#58287
Wrench, Wheel, Wreck, Repeat...
Back to top Go down
crazykid1994
Veteran
Veteran
crazykid1994

Age : 24
Join date : 2013-03-18
Posts : 618
Forum Rep : 0
Location : loxahatchee, florida

Carburetor Swap Empty
PostSubject: Re: Carburetor Swap   Carburetor Swap Icon_minitimeTue Aug 27, 2013 10:30 am

Oh. Lol. I had a bit more power out of it. Well it seemed like it. Maybe it was just throttle response seeming like it.
Back to top Go down
Doc Sprocket
Administrator
Administrator
Doc Sprocket

Age : 46
Join date : 2013-04-21
Posts : 2911
Forum Rep : 19
Location : Ontario Canada

Carburetor Swap Empty
PostSubject: Re: Carburetor Swap   Carburetor Swap Icon_minitimeTue Aug 27, 2013 10:38 am

@crazykid1994 wrote:
Oh. Lol. I had a bit more power out of it. Well it seemed like it. Maybe it was just throttle response seeming like it.
That's possible. Also, if the old carb was not functioning 100% or a bit clogged up or whatever, you could have gotten some power back, seeming like a gain.

_______________________________________________
***Get YOUR official "Doc Locked, And Ready To Rock!" Stickers by clicking here!***
***Official Sprocket's Garage vinyl graphics and tees for sale HERE!***
Carburetor Swap Facebo12
Put down the wrench, and come out with your hands up!-Doc "Tranny Crusher" Sprocket, ATLTF Forum Admin, Thinkerer and Tinkerer, and all-around good dood. Wink

Gen. Mayhem- http://www.atltf.com/t2597-general-mayhem-race-tractor
MULE- http://www.atltf.com/t2153-lawn-boy-utltv
MULEII- http://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
MULEIII http://www.atltf.com/t4263-mule3-brainstorming-ideas-etc#58287
Wrench, Wheel, Wreck, Repeat...
Back to top Go down
jack9102
Apprentice
Apprentice
jack9102

Age : 23
Join date : 2013-03-17
Posts : 103
Forum Rep : 0
Location : Sudbury, ON, Canada

Carburetor Swap Empty
PostSubject: Re: Carburetor Swap   Carburetor Swap Icon_minitimeFri Aug 30, 2013 8:39 am

Common setup Ive used (outside of my current tractor mod hobby) on briggs/tecumseh/honda and yes, one kohler, was make a flange-barbed pipe fitting adapter. IE one side bolts to engine intake port other gets pipe from carb squished on.

Broadly similar to motorcycle intake setups using hoseclamps instead of flanges and gaskets.

The most common and I found easiest to tune was a mikuni PK series that had needle adjustment for the high speed. I can't remember the complete model # but basically its a small (20-25mm?) slide carb with a manual butterfly choke and a float bowl. The one I used on my honda 240 had a busted choke, so I removed it and polished the insides. The engine would snap to redline like a weedeater. Very responsive, and probably throwing 14h from 9 stock.
Back to top Go down
Sponsored content




Carburetor Swap Empty
PostSubject: Re: Carburetor Swap   Carburetor Swap Icon_minitime

Back to top Go down
 
Carburetor Swap
Back to top 
Page 1 of 1
 Similar topics
-
» briggs flathead carb on ohv motor... can it work?
» tire swap on TORQUE (ford/craftsman)
» pulley swap on a hydro
» Pulley swap
» Tecumseh hh100 carb?

Permissions in this forum:You cannot reply to topics in this forum
All-Terrain Lawn Tractor Forum :: Technical Forum :: Engine Tech :: General Engine Tech-
Jump to: