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Old 04-22-2004, 09:44 AM
m1e9r5c6's Avatar
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B&S intake valve stuck open

Once again I come in need of your help. I finally fixed the recoil clutch on my 5hp Briggs & Stratton, it ran fine and I even mulched the garden Saturday.

I pulled out the mulcher yesturday to mulch in some peat and the thing wouldn't start. It seemed to be back firing out the carb. So I though the timing was out (sheered fly wheel key perhapse? No that wasn't it!), checked for spark (yep plenty of spark), check for fuel (yep there too).

Finally I looked down the sparkplug hole! What do I see?! The intake vavle wide open. A gentle tap with a screwdriver knocked it down again but, when the engine was turned over it stuck wide open again!! I tried to spray some WD-40 in there but that didn't seem to loosen it.

My question, since I'm new to small engines, is what could make the valve do this? Do these "L" head (flathead) engines have valve springs to break or how do they work? What should be my first course of action?

Thanks for any insite you guys may have.

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Old 04-22-2004, 10:02 AM
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Too much lift!

LOL, yep, broken spring or retainer!
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Old 04-23-2004, 04:01 PM
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broken valve spring or keeper

I agree with the wrench. Have you already started disassembling the motor yet?


Tazz


Rat Rods Rule!
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Old 04-24-2004, 01:27 AM
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You will need to take the carb off, then take off the breather/cover plate to see what's goin on with the valve springs and clips.
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Old 04-26-2004, 03:02 PM
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Thanks for all the replies!

I took the carb and tank off and took a look at the valve springs. They were fine, so I sprayed the springs and vavles down with carb cleaner and let it sit for a while. Problem solved! I guess they must have just gunked up over the years. Yet another lesson learned. Thank for the help, now if only I could get it to idle without pulsing.
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Old 04-26-2004, 05:22 PM
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Quote:
Originally posted by m1e9r5c6
Thanks for all the replies!

now if only I could get it to idle without pulsing.
Briggs are bad about that, not much you can do besides adjusting the high speed jet, or replacing the carb.
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Old 04-29-2004, 11:18 AM
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I did try adjusting what looked like the idle mixture screw on the side of the carb but nothing happened. What else could this spring loaded screw be for?
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Old 04-30-2004, 05:13 AM
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There's probably an obstruction in the idle circuit, remove the carb bowl and clean the jet and passages well, that is the mixture screw!
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