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Any small engine gurus?

pinchshopper 490 414 March 20, 2012 at 06:43 PM
Just purchased a used mower:


Model: 281320BE (Snapper)
Ser: 11344743

Engine: (13 hp signature series)

Model:28M707 (B&S)
Type: 1166-E1
Code: 00091170

Carburetor:

Walbro - 5-4993 LMT (Only other number I found was 57 on top of Carb)


What I've Done since purchase:

Changed Oil
New Air Filter
New Fuel Filter
New Fuel Line
New Spark Plug

Ran fine yesterday for hours, although power isn't what it should be.

Today I fueled it up, ran fine for 15 minutes or so, then it cut off, and I noticed gas was seeping out the vent of gas tank. The tank was not overfilled. Took cap off, ran for a few seconds then cut off. Cranked a few more times, and ran for a few seconds, then cut off.

Took the carb off, there is no LMT number to be found on the carb, which is apparently the majic number that the whole carburetor world hinges upon, but there is a 57 cast into the top of the carb beside the B&S logo. No record of a LMT 57 with B&S, so not sure what carb kit I need.

Took the bowl off the carb, and there was a yellow powder substance on the internal aluminum housing. One of the 2 holes in the bottom of the aluminum was clogged and the other was partially blocked. There was a little trash in the bowl. Blew through the ports by mouth just to see if air was passing through. Put it back together, and it cranks and runs. I finished cutting the yard, but the motor lacks power.

A couple of questions that I have:

How do I know what carb I have since there is no LMT # anywhere to be found on the carb , so I can order a kit if needed? How do I know what replacement carbs will work?

How do I adjust the carb, and will this give it more power? The engine doesn't seem to rev up as high as it should at wot. Also, I had a snapper a few years ago with a 11hp, which was a brute. Since this one is 13hp, I would expect it to be even more powerful. My 11 hp would pour on the coal when it got under load, but this engine seems to lose power.

Thanks for any advice and help.

2 Comments

1

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#2
The typical starting point is to screw idle jet all the way in (count turns so you can put it back if necessary ) then back it out 1 1/2 turns. I would try spraying it out with carb cleaner first. If it runs with the cap loose and stops when tight ,the vent in the cap is clogged. when you had it apart did you notice if the float was operational ( not jammed or flooded). You also need to check the points and condenser
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#3
Quote from dollarbill View Post :
The typical starting point is to screw idle jet all the way in (count turns so you can put it back if necessary ) then back it out 1 1/2 turns. I would try spraying it out with carb cleaner first. If it runs with the cap loose and stops when tight ,the vent in the cap is clogged. when you had it apart did you notice if the float was operational ( not jammed or flooded). You also need to check the points and condenser
The tank vent is fine, it cut off with the cap off.

I took the float off and checked the needle attached to it.

Cleaning that trash out has it running as good as it was, but it's still not up to full power.

This is the carburetor that I have, but everyone wants a LMT # for a kit or a replacement. I can't locate one, but it does have a 57 cast into the top of carb, but they say that 57 is not a valid LMT #.

http://outdoorpowerinfo.com/repai...t_carb.asp

(mine is the older type show in picture #3) The 2 holes that were clogged were the two smaller ones shown in picture #5)
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Last edited by pinchshopper March 20, 2012 at 07:56 PM.
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