A question for the Pro's

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  #1  
Old 12-28-09, 07:39 AM
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A question for the Pro's

I know a little about small engine repair......very little, enough so I may be a danger to myself and others!

I have a few questions that the search function didn't help with that I am hoping you all can help answer.

1. Do all these newer small engines run like garbage with these non adjustable carbs or might there be more to my problem.....I know that is an open question in that you don't know what my machine is doing, but in general are they more of a pain than the adjustable jet carbs or are they better seeing they are factory set and forget about it type.

2. Has anyone swapped out a no adjustable carb for an adjustable one and did it work right, so long as you use one from the same hp engine?

I am curious as to what you all think.

Thanks for looking guy's

Dave
 
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Old 12-28-09, 02:48 PM
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Answer to question # 1. NO. Just like all other equipment, you do need to take care of them properly. The bigger problem is the E-10 gas that we all are now using. And this will work itself out in a couple of years the same way that unleaded gas did. When unleaded gas became mandatory, there were all kinds of rumors flying that a pre 1970 car would not run on unleaded gas and would burn all the valves & pistons and everything else. Yet, we still see cars from the 20's driving to a car show.
 
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Old 12-28-09, 06:37 PM
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No, they usually run just fine even with non-adjustable carbs. I assume yours ran fine when it was new. Usually when they aren't running right, it's because something needs repair.

Yes, I have swapped non adjustable and adjustable carbs and visa-versa with no problems as long as you are swapping carbs designed for the same engine and controls.
 
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Old 12-29-09, 04:30 AM
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Thank You Guy's

These are the answers I was hoping for.

As for the 1st question I can't really answer how the machine ran from new but I am quite sure I used it (snowblower) the same year my brother inlaw purchased it, and if I remember correctly I had to have it on slight choke for it to run good when I got into heavier deeper snow.I am going to rebuild the carb and go from there.

Thank You Indypower1, Is this regular gas eating certain rubber seals and gaskets in carburetors like some were saying it was a few years back? I thought I remember some people in the marine repair saying this?

Thank You Cheese, I thought the carbs looked exactly alike. The only difference I see is one is a Tecumseh and the other a Briggs.

Thanks Again Guy's!
 
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Old 12-29-09, 08:49 AM
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I think the variations in what fuel is available is causing more problems than carb adjustability. Some areas have E10 as a new thing, some have E15 or higher, some areas have been selling E10 for a long time. Some still sell regular 100% 87 octane gasoline, and the machines have a non adjustable carb, all coming out of one factory that is supposed to run any of these fuels thru it. Plus the "shelf life" of these new alcohol blend fuels is much shorter than what we are used to, they attract water and also don't stay blended like they are supposed to.
 
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Old 12-29-09, 09:05 AM
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Yes, ethonal can eat rubber hoses & seals. Most seals have been a polyeurthane materail for years so that should not be a problem. Rubber hoses have been a problem, but you can now get hose that is made a mtaerial resistant to ethonal.
As for the carbs, the Tecumseh will not work on a Briggs and vice versa.
 
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Old 12-29-09, 09:57 AM
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Originally Posted by indypower1 View Post
Yes, ethonal can eat rubber hoses & seals. Most seals have been a polyeurthane materail for years so that should not be a problem. Rubber hoses have been a problem, but you can now get hose that is made a mtaerial resistant to ethonal.
As for the carbs, the Tecumseh will not work on a Briggs and vice versa.
Wow, they look almost exactly the same, although I'm not holding one right next to the other.I did also wonder if that could be an issue between the two.

Thank You both for the info on fuel and it's issues.
 
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Old 12-29-09, 10:33 AM
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Originally Posted by Honda 327 View Post
Wow, they look almost exactly the same, although I'm not holding one right next to the other.I did also wonder if that could be an issue between the two.

Thank You both for the info on fuel and it's issues.
It is how they are made on the inside that is different. The size, number & placement of the holes. A 5 hp Tecumseh carb uses the same basic body as a 10 hp carb. Needle, seat, bowl gasket & float are the same. Yet, the 5hp carb will NOT give full throttle on a 10 hp engine due to smaller & less holes than needed to fuel the 10 hp. Most 5 hp snowblowers have a 1/2 gallon gas tank and will clear a driveway on that gas or less. The 10hp has a 1 gallon gas tank and will use all that and maybe more to clear the same size driveway.
 
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Old 12-29-09, 02:10 PM
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Right, the briggs and tecumseh carbs are not going to interchange. When I say you can interchange carbs, I mean adjustable and non adjustable models of the same carb or similar carbs made for the same engine. A briggs 15 hp ohv engine could have a number of different carbs on it, some adjustable, and some not, and most of them are interchangeable. Same with many other engines. Some tecumseh carbs are interchangeable, some are adjustable. Yours needs cleaning.
 
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