Briggs and Stratton 20.5 Twin 461777 Type 0137E1

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Old 08-29-08, 06:05 AM
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Briggs and Stratton 20.5 Twin 461777 Type 0137E1

1. What are some of the reasons or reason this engine would spend for a long period before firing.

2. How does the fuel pump( Model 4607) work? (trying to determine if I need to rebuild)

3. What are some of the tell-tell signs of the magneto breaking down.

4. Engine seems to have a miss. (not continuous)?
 
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Old 08-29-08, 11:27 PM
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The long-crank time and miss both could be due to carb problems. Usually accompanied by a surge with the choke off.

The fuel pump consists of a diaphragm and check valves that are operated by pulses of pressure from the crankcase.

Magneto problems usually begin as heat related engine performance problems and stalling. Usually works fine when it's cold.
 
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Old 08-30-08, 06:29 AM
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Originally Posted by cheese View Post
The long-crank time and miss both could be due to carb problems. Usually accompanied by a surge with the choke off.

[COLOR="Red"]No surge, just an occasional miss.[/COLOR


]The fuel pump consists of a diaphragm and check valves that are operated by pulses of pressure from the crankcase.

1.Would low engine compression affect the fuel pump? (engine has all most 100 psi) 2. Do you recommend rebuilding the fuel pump as a possible fix for long crank time?


Magneto problems usually begin as heat related engine performance problems and stalling. Usually works fine when it's cold.
When it gets hot, will that result in long crank time and or not start at all?
 
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Old 08-30-08, 11:23 AM
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There should be fuel remaining in the carburetor float bowl when you shut your engine down, unless it was run out of fuel. This being the case, chances are the fuel pump is not the cause of hard to start issues.

Check the engine for ignition spark when it is hot and hard to start, to rule this out. It is possible that you may have a problem with a loose valve seat or insufficient valve lash.
 
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Old 08-31-08, 06:42 AM
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Originally Posted by 30yearTech View Post
There should be fuel remaining in the carburetor float bowl when you shut your engine down, unless it was run out of fuel. This being the case, chances are the fuel pump is not the cause of hard to start issues.

Check the engine for ignition spark when it is hot and hard to start, to rule this out. It is possible that you may have a problem with a loose valve seat or insufficient valve lash.
Thanks for your help
Billy
 
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