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  #1  
Old 05-16-2005, 10:37 AM
SER SER is offline
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B&S Quantum engine trouble!

Hi all.
I did a tune up on a 5HP B&S engine on a Toro mower. I changed the oil, spark plug, and installed a new needle and seat in the carb. The engine runs fine when you use it, then when you stop it to empty the grass bag, it becomes very hard to start. Someone said I should have taken the head off and checked for carbon build up, then checked the valves while I was there.
Any suggestions here?????

SER
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Old 05-16-2005, 11:16 AM
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Restrorob Restrorob is offline
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What was the reason for replacing the needle and seat ? Does it seem flooded when you try to restart ? Are you choking on restart ? Does it start right up cold ? These questions will give me a idea where to send you !
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Old 05-16-2005, 11:29 AM
SER SER is offline
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I replaced them because I usually do this when I tune up an engine. It does not seem to be flooded, although I could be wrong. I put the throttle at the starting position when starting. It still does not start sometimes.
What do you think about compression loss, ie, carbon build up at the head and checking the valves?
SER
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Old 05-16-2005, 11:55 AM
jubiljoe jubiljoe is offline
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?

if the unit is over head valve I would check the valve clearance.
but is sounds like the"Start" mode could be causing the problems
if start= choke you are flooding the engine.
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Old 05-16-2005, 11:56 AM
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Restrorob Restrorob is offline
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Quote:
Originally Posted by SER
I replaced them because I usually do this when I tune up an engine. It does not seem to be flooded, although I could be wrong. I put the throttle at the starting position when starting. It still does not start sometimes.
What do you think about compression loss, ie, carbon build up at the head and checking the valves?
SER
I really don't believe carbon is the problem here,I'm leaning more to carb. or a coil heating up and dropping spark,Was it running ok before you tuned it up ?
Its not necessary to replace the needle & seat with a tune-up,Only when you have a flooding or rich running problem.
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Old 05-16-2005, 12:02 PM
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Quote:
Originally Posted by jubiljoe
if the unit is over head valve I would check the valve clearance.
but is sounds like the"Start" mode could be causing the problems
if start= choke you are flooding the engine.

I had that thought also but I figured maybe he has owned the unit long enough to know not to choke a hot Briggs.
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  #7  
Old 05-17-2005, 11:21 AM
SER SER is offline
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start choke mode??

To Jubil Joe:

What do you mean by start mode? You dont have to choke the machine or prime it when you retstart it?
SER
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Old 05-17-2005, 11:59 AM
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Restrorob Restrorob is offline
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Quote:
Originally Posted by SER
To Jubil Joe:

What do you mean by start mode? You dont have to choke the machine or prime it when you retstart it?
SER

In most cases a warm Briggs engine will restart without choke or prime,If you are doing so it could cause a too rich restart or flooded restart.
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