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#1
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B&S valve clearance
Hi group. I'm trying to get the neighbor ladys old Yard King rider
going for at least one more season. It has a 11 HP B&S vertical. It's almost impossable to start. It spits and pops while cranking. I've cleaned the carb, and the fire is bright blue and strong. My thoughts are, that the valve clearance has gone to nothing with all the hours. Can someone give me the clearances for the old 11 HP B&S Vertical ?? Thanks Johnny |
#2
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B&S valve clearance
if it is a L head style the valve clearance is intake 0.005" - 0.007" and
exhaust is 0.009" - 0.011". if you need more info provide the model# type # and code# off the engine. with the L head engine the valves usually don't go out of adjustment but the valve become burnt and fail to seal requiring a valve servicing. |
#3
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B&S valve clearance
I am not an expert, but with all the time I have invested in my Deere with a
K321, I have a little advice. Make sure the Point Gap is correct, I found if the points are out .0025 that it changes the timing. If they're out any further, you may not get a good spark. Make sure the fuel lines are clean and unobstructed. just my 2 cents. "Johnny" wrote in message om... Hi group. I'm trying to get the neighbor ladys old Yard King rider going for at least one more season. It has a 11 HP B&S vertical. It's almost impossable to start. It spits and pops while cranking. I've cleaned the carb, and the fire is bright blue and strong. My thoughts are, that the valve clearance has gone to nothing with all the hours. Can someone give me the clearances for the old 11 HP B&S Vertical ?? Thanks Johnny |
#4
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B&S valve clearance
Johnny, Before you mess with the valves, you might want to check the compression, then squirt a little oil into the cylinder, crank a few revs w/o the plug to whet the rings, and check again. If compression is poor it's either rings or valves. If compression improves after squirting in that oil, its localized to the rings. Of course, if the compression is good, the problem is elsewhere. Your problem could also be timing, which is essentially dependent upon a good flywheel and key (ZERO damage to both), the ignition coil air-gap, no rust filings on the laminations (just clean them off), and correctly set points - if there are any. Before pulling the flywheel I suggest obtaining a new key - they are cheap and you might need it for reassembly. A new plug is also cheap insurance if in doubt. If you are not an expert, it is also possible you missed some deposits or something subtle with the carburetor. I had a "master mechanic" do that with my Quadrajet a few decades ago. I'm sure I left out some stuff, but the above should be a decent start. Good luck, Steve Johnny wrote: Hi group. I'm trying to get the neighbor ladys old Yard King rider going for at least one more season. It has a 11 HP B&S vertical. It's almost impossable to start. It spits and pops while cranking. I've cleaned the carb, and the fire is bright blue and strong. My thoughts are, that the valve clearance has gone to nothing with all the hours. Can someone give me the clearances for the old 11 HP B&S Vertical ?? Thanks Johnny |
#5
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B&S valve clearance
"Dr. Doctor" wrote in message ...
if it is a L head style the valve clearance is intake 0.005" - 0.007" and exhaust is 0.009" - 0.011". if you need more info provide the model# type # and code# off the engine. with the L head engine the valves usually don't go out of adjustment but the valve become burnt and fail to seal requiring a valve servicing. Thanks Doc. I'll get into it and check the clearance this afternoon, If it's not the clearance I'll pull the head and replace or reseat the valves. As for the point gap . It's solid state ignition. Johnny |
#6
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B&S valve clearance
Steve,
Do you know what a good compression number may be? "Stephen Kurzban" wrote in message ... Johnny, Before you mess with the valves, you might want to check the compression, then squirt a little oil into the cylinder, crank a few revs w/o the plug to whet the rings, and check again. If compression is poor it's either rings or valves. If compression improves after squirting in that oil, its localized to the rings. Of course, if the compression is good, the problem is elsewhere. Your problem could also be timing, which is essentially dependent upon a good flywheel and key (ZERO damage to both), the ignition coil air-gap, no rust filings on the laminations (just clean them off), and correctly set points - if there are any. Before pulling the flywheel I suggest obtaining a new key - they are cheap and you might need it for reassembly. A new plug is also cheap insurance if in doubt. If you are not an expert, it is also possible you missed some deposits or something subtle with the carburetor. I had a "master mechanic" do that with my Quadrajet a few decades ago. I'm sure I left out some stuff, but the above should be a decent start. Good luck, Steve Johnny wrote: Hi group. I'm trying to get the neighbor ladys old Yard King rider going for at least one more season. It has a 11 HP B&S vertical. It's almost impossable to start. It spits and pops while cranking. I've cleaned the carb, and the fire is bright blue and strong. My thoughts are, that the valve clearance has gone to nothing with all the hours. Can someone give me the clearances for the old 11 HP B&S Vertical ?? Thanks Johnny |
#7
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B&S valve clearance
Briggs & Stratton gave me such a wide variance on it that I didn't bother to write it down, telling me it depended upon the temperature and so many other factors that the number wasn't all that important. I believe it was 60 - 110 or some such for the 11 hp motor I had called about. What I do know is there should be enough of a difference in the reading between wet and dry readings to make a determination if the original posters problem was worn or broken rings. Best, Steve Justbrilliant wrote: Steve, Do you know what a good compression number may be? "Stephen Kurzban" wrote in message ... Johnny, Before you mess with the valves, you might want to check the compression, then squirt a little oil into the cylinder, crank a few revs w/o the plug to whet the rings, and check again. If compression is poor it's either rings or valves. If compression improves after squirting in that oil, its localized to the rings. Of course, if the compression is good, the problem is elsewhere. Your problem could also be timing, which is essentially dependent upon a good flywheel and key (ZERO damage to both), the ignition coil air-gap, no rust filings on the laminations (just clean them off), and correctly set points - if there are any. Before pulling the flywheel I suggest obtaining a new key - they are cheap and you might need it for reassembly. A new plug is also cheap insurance if in doubt. If you are not an expert, it is also possible you missed some deposits or something subtle with the carburetor. I had a "master mechanic" do that with my Quadrajet a few decades ago. I'm sure I left out some stuff, but the above should be a decent start. Good luck, Steve Johnny wrote: Hi group. I'm trying to get the neighbor ladys old Yard King rider going for at least one more season. It has a 11 HP B&S vertical. It's almost impossable to start. It spits and pops while cranking. I've cleaned the carb, and the fire is bright blue and strong. My thoughts are, that the valve clearance has gone to nothing with all the hours. Can someone give me the clearances for the old 11 HP B&S Vertical ?? Thanks Johnny |
#8
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B&S valve clearance
Stephen Kurzban wrote in message ...
Briggs & Stratton gave me such a wide variance on it that I didn't bother to write it down, telling me it depended upon the temperature and so many other factors that the number wasn't all that important. briggs doesn't publish compression specs because they have a compression release and the number mean squat. the valve face and seat wear, causing you to lose clearance. check the clearance set them at .006 and .010. as for the guy with the quadrajet, did the tech forget about the famous secondary metering well leak??? Chip |
#9
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B&S valve clearance
Chip, On an older 11 HP vertical B&S engine, are you sure there is a compression release? Pulling a head on motor with good compression sounds like a lot of work even if you have a good mechanical background... . Maybe rotating the flywheel with the plug in will give a decent indication by feel on that compression, and if there is a release you might just "detect" that too? Most of my piddling has been on cars, but I would think compression is as compression does where engines are concerned - no? At any rate, I hoped my experience with cars would carry over enough not to mislead the original poster. (...Quadrajet) did the tech forget about the famous secondary metering well leak??? He left the discharge check ball in the accelerator passage. I believe that foam insert in the carb kits cures a lot of leaking plug problems without the tech ever knowing what fixed the problem ;-) Best, Steve Chip Stein wrote: Stephen Kurzban wrote in message ... Briggs & Stratton gave me such a wide variance on it that I didn't bother to write it down, telling me it depended upon the temperature and so many other factors that the number wasn't all that important. briggs doesn't publish compression specs because they have a compression release and the number mean squat. the valve face and seat wear, causing you to lose clearance. check the clearance set them at .006 and .010. as for the guy with the quadrajet, did the tech forget about the famous secondary metering well leak??? Chip |
#10
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B&S valve clearance
chip is right there is a compression release effecting readings at starting
rpms and that is why Briggs give no spec for compression. Instead you do a cylinder leak down test. |
#11
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B&S valve clearance
Not only that, but when I re-read the original comment, it didn't say the engine had any problems while running, just in starting. I must have dismissed that point, so while the problem effects compression, my suggestion to do a compression check was a waste of time. What you and Chip indicate is far more relevant. Thanks for correcting me :-) Best, Steve "Dr. Doctor" wrote: chip is right there is a compression release effecting readings at starting rpms and that is why Briggs give no spec for compression. Instead you do a cylinder leak down test. |
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