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 Backfiring out the carb

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redlinemotorsportts
willis923
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willis923
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Backfiring out the carb - Page 2 Empty
PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 12:21 pm

this is how i set mine up, mine is a 10 horse, smaller carb, but same family of carbs. so, it should work for you.

i removed the fuel pump that was threaded in, and put in a 1/4 inch brass nipple.
Backfiring out the carb - Page 2 NCM_02681_zps87f5f2db

i got a new style Mikuni pump from "jim micco and sons on ebay" for about 15 bucks

Backfiring out the carb - Page 2 NCM_02691_zps3fcec6a7

ran a line from the crankcase breather, about 6 inches long, then another from the filter to the intake on the pump, and then another, about 12 inches long to the carb.

Backfiring out the carb - Page 2 NCM_02701_zps8dffdaad


this setup has never let me down, even hanging freely like it is. when i paint it for the buildoff, i plan on fastening it to the shroud, and making everything pretty
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Dipshaw87
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 1:07 pm

What model fuel pump is that? And the flywheel key is in good shape and not sheared
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Doc Sprocket
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 1:23 pm

@willis923 wrote:
good catch doc, i completely missed the flywheel key. thats why we have forums though, teamwork

Precisely.

@Dipshaw87 wrote:
What model fuel pump is that?
Those pumps appear on all sorts of OEM applications, including the Vanny twins.

Quote :
And the flywheel key is in good shape and not sheared
Well, pity that the problem's not yet solved. however- eliminating it as a possibility is actually forward progress, even if it doesn't feel like it.

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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- https://www.atltf.com/t2597-general-mayhem-race-tractor
MULE- https://www.atltf.com/t2153-lawn-boy-utltv
MULEII- https://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
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Wrench, Wheel, Wreck, Repeat...
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Dipshaw87
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 1:31 pm

Oh ok so any oem fuel pump would work? And yea it honestly feels like I'm getting nowhere on this thing lol
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Doc Sprocket
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 1:41 pm

Pretty much any diaphragm style pump, that will deliver less than 5psi, or you'll run into flooding issues.

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Backfiring out the carb - Page 2 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- https://www.atltf.com/t2597-general-mayhem-race-tractor
MULE- https://www.atltf.com/t2153-lawn-boy-utltv
MULEII- https://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
MULEIII https://www.atltf.com/t4263-mule3-brainstorming-ideas-etc#58287
Wrench, Wheel, Wreck, Repeat...
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Dipshaw87
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 1:45 pm

Ok. Now I have a question am I able to use a completely different carb like a kohler #26 or something else on this engine? Or should I just look into getting a whole new walbro carb if the fuel pump idea doesn't work
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Doc Sprocket
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 1:52 pm

Fitting a non-stock carb leaves 4 hurdles to jump.

1)Mounting. If it doesn't bolt right up in the correct orientation, you gotta get creative.
2)Venturi size. Too big is just as useless as too small.
3)Jetting. Odds are pretty good that you'll have to play with the mixtures. Easier on some carbs than others.
4)Governor linkage- if the carb didn't come off your engine type, 99% chance you're gonna have a real problem with the governor.


_______________________________________________
***Get YOUR official "Doc Locked, And Ready To Rock!" Stickers by clicking here!***
***Official Sprocket's Garage vinyl graphics and tees for sale HERE!***
Backfiring out the carb - Page 2 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- https://www.atltf.com/t2597-general-mayhem-race-tractor
MULE- https://www.atltf.com/t2153-lawn-boy-utltv
MULEII- https://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
MULEIII https://www.atltf.com/t4263-mule3-brainstorming-ideas-etc#58287
Wrench, Wheel, Wreck, Repeat...
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Dipshaw87
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Backfiring out the carb - Page 2 Empty
PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 1:55 pm

Never thought of that lol ok let me try the fuel pump idea. I'll see if I can get one off amazon or somewhere cause I don't have any laying around here
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Dipshaw87
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 2:01 pm

Is there any fuel pump I should stay away from?
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Doc Sprocket
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 2:21 pm

None that I can think of. I like these, because they are rebuildable. ---> http://www.arcracing.com/servlet/the-23/pulse-fuel-pump-Mikuni/Detail

_______________________________________________
***Get YOUR official "Doc Locked, And Ready To Rock!" Stickers by clicking here!***
***Official Sprocket's Garage vinyl graphics and tees for sale HERE!***
Backfiring out the carb - Page 2 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- https://www.atltf.com/t2597-general-mayhem-race-tractor
MULE- https://www.atltf.com/t2153-lawn-boy-utltv
MULEII- https://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
MULEIII https://www.atltf.com/t4263-mule3-brainstorming-ideas-etc#58287
Wrench, Wheel, Wreck, Repeat...
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Dipshaw87
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 3:44 pm

Have you used that pump before?
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willis923
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Backfiring out the carb - Page 2 Empty
PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 5:56 pm

i meyself havent, however, mikuni is one of the most respected names in fuel delivery systems

_______________________________________________
-1974 bolens 1055 (Rolling Thunder)
-1989 Craftsman GT6000 (Blockhead)
-2004 Ford F-250 super duty FX4
-1999 Ford F-350 Superduty 4x4 7.3 Powerstroke


Lt wrote:
Feel free to try... Dont let anything but fear and common sense stop you. 


Backfiring out the carb - Page 2 Pbucket

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Dipshaw87
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 6:17 pm

Ok so let me ask this. I'm not that good with old style carbs at all. If it's running to lean then it backfires out the carb and if it runs rich will it backfire out the exhaust? Can it be backfiring because of the valves needing adjusted?
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Doc Sprocket
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 6:39 pm

@Dipshaw87 wrote:
Have you used that pump before?

Yup. Also use the one Willis showed.

_______________________________________________
***Get YOUR official "Doc Locked, And Ready To Rock!" Stickers by clicking here!***
***Official Sprocket's Garage vinyl graphics and tees for sale HERE!***
Backfiring out the carb - Page 2 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- https://www.atltf.com/t2597-general-mayhem-race-tractor
MULE- https://www.atltf.com/t2153-lawn-boy-utltv
MULEII- https://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
MULEIII https://www.atltf.com/t4263-mule3-brainstorming-ideas-etc#58287
Wrench, Wheel, Wreck, Repeat...
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Stretch44875
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 6:40 pm

If intake valve is not closing completely, or out of adjustment, it can cause backfiring in carb.
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Dipshaw87
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 6:42 pm

What model number was that one that Willis showed? And I thought about that but I'm not sure of the specs for the valve lash
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Dipshaw87
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 6:46 pm

Would a bad float have anything to do with this?
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willis923
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 7:43 pm

a float could be sticking or hanging up, not allowing it to drop all the way and restricting the fuel flow into the bowl. before you go buying parts, i'd take the bowl off, inspect everything one last time. THEN spend cash on parts. in regards to the fuel pump, i dont have a model number. theyre all the same anyway.

_______________________________________________
-1974 bolens 1055 (Rolling Thunder)
-1989 Craftsman GT6000 (Blockhead)
-2004 Ford F-250 super duty FX4
-1999 Ford F-350 Superduty 4x4 7.3 Powerstroke


Lt wrote:
Feel free to try... Dont let anything but fear and common sense stop you. 


Backfiring out the carb - Page 2 Pbucket

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1st Lieutenant, Volunteer Firefighter, EMT-B, Galway Vol Fire co. Galway NY
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Dipshaw87
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 8:18 pm

Ok I've taken the carb off 4 times and still I don't know what all to do. But I'll work on it more tomorrow and keep you guys updated. I thank you guys very much for helping me cause I don't know what I'm doing lol
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Lawren Wimberly
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 8:34 pm

@Doc Sprocket wrote:
Fitting a non-stock carb leaves 4 hurdles to jump.

1)Mounting. If it doesn't bolt right up in the correct orientation, you gotta get creative.
2)Venturi size. Too big is just as useless as too small.
3)Jetting. Odds are pretty good that you'll have to play with the mixtures. Easier on some carbs than others.
4)Governor linkage- if the carb didn't come off your engine type, 99% chance you're gonna have a real problem with the governor.


All do-able, if ya have years of experience with engines like some here do... not something I'd recommend to the beginner.

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I can do anything I set my mind to... the impossible just takes me a little longer   Backfiring out the carb - Page 2 1222323911

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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeSun Feb 23, 2014 8:49 pm

Here's a video of the bolens

https://youtu.be/7-unQLWByeQ
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Lawren Wimberly
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeMon Feb 24, 2014 3:12 am

I'd check the valve lash.... I'm thinking it is an overhead valve engine. I think the valves are gapped too small and your intake is staying open once the engine warms up


Forget the carb and governer for now, and check the basics... valve lash first, then timing

Just my two cents

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I can do anything I set my mind to... the impossible just takes me a little longer   Backfiring out the carb - Page 2 1222323911

Tech Manual mod, If ya need it, and cant find it... Just ask.... Pm if I'm not on line
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeMon Feb 24, 2014 8:16 am

What are the valve lash specs for that engine?
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Lawren Wimberly
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeMon Feb 24, 2014 8:59 am

Google can tell ya quick. 4 to 10 thousanths on the OH16. 5-6 thousanths is a good starting point for most OHV small engines.

(ref. http://outdoorpowerinfo.com/engine_specs/tecumseh_valve_gaps.asp ) ( ... The last entry on the page)


this vid shows correct governer and carb linkage

https://www.youtube.com/watch?v=l1_QOJt_0_g






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I can do anything I set my mind to... the impossible just takes me a little longer   Backfiring out the carb - Page 2 1222323911

Tech Manual mod, If ya need it, and cant find it... Just ask.... Pm if I'm not on line
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeMon Feb 24, 2014 9:00 am

Thanks! Will these specs work for the 16 hp?
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PostSubject: Re: Backfiring out the carb   Backfiring out the carb - Page 2 Icon_minitimeMon Feb 24, 2014 9:03 am

it shows 13.5 - 17 hp, so yeah

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I can do anything I set my mind to... the impossible just takes me a little longer   Backfiring out the carb - Page 2 1222323911

Tech Manual mod, If ya need it, and cant find it... Just ask.... Pm if I'm not on line
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