Briggs & Stratton

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The intake should be 3 to 5 thousand. and the exhaust should be 5 to 7 thousand. i always set them right at 4 thousand and they run fine.

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Clearances differ for the two valves and typically range from . 002 – . 004″ to . 005 – .
Valve Clearance Tips

Recommended valve-to-piston clearance is generally 0.080-inch minimum on the intake side and 0.100-inch minimum for the exhaust valve. The exhaust needs a little more clearance because it expands more with heat.

This is the total volume remaining in the cylinder at the end of the piston stroke. This consists of the volume between the end of the piston and the cylinder head, in the valve ports and the volume in the suction valve guards and the discharge valve seats [26].
What are valve clearances? Valve clearances on motorcycle and car engines effectively relate to the gap between the top of the valve stem and the cam that operates it. The inlet valves in the engine open to allow air and fuel into the cylinder, while the exhaust valves let the burnt gases out.
Adjusting the valves means setting the appropriate clearance between the base circle of the camshaft, otherwise known as the camshaft heel, and the tip of the valve or rocker arm, depending on the valve train setup.
Rule of nine

With any given valve open, count what number valve that is from the front. Subtract that number from nine. Whatever number you`re left with is the valve you`re in position to set. So, with number 1 rocker opening its valve, you`ll be setting clearance on (9 minus 1), number 8 valve.

If the valve clearance is too tight, then the valve will open earlier and close later then intended. If it too loose, the valve will open later and close earlier. The effect of setting the valve lash too tight can result in the valve not fully closing on the seat.
Check the clearance between the top rocker arm and the corresponding valve stem, located in the center of the valve spring, using a feeler gauge. If the clearance reading falls outside of the acceptable range of . 005- and . 007-inch, the top exhaust valve is out of adjustment.
To do that on a four-cylinder, eight-valve engine, use the rule of nine. Counting from the front of the engine if number eight valve is fully open, subtract eight from nine and the answer is one, so adjust the clearance on valve number one. If number six is closed, then adjust number three and so on.

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How do I remove and clean air filter? – Briggs & Stratton Lawn-Boy 10640 20-Inch 6.5 HP Gas Powered Lawn Mower
ANSWER : There should be a square of plastic on the side of the engine which is opposite of the muffler. It has a small hex head with a slot cut in it. Remove this plastic cover and the air cleaner should be inside of it.

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Wshat is the valve clearence for a 24 hp briggs and stratton engine model 446677 type 0470E1 code 050405yh
ANSWER : About a mm or .004″.

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Oil quanity I have 20 hp craftsman briggs and stratton twin how much oil when you change out oil
ANSWER : Usually 1 qt

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My 24hp Briggs and Stratton ohv engine has bent push rods on one side. The top valve can be pushed in but the bottom one will not push in. Is the valve stuck in the open position? If so how can it be fixed?
ANSWER : Unable to answer if valve opened or not but does sound like ur bottom valve is bent or piston made contact and bent it to fix need to remove head and replace valve also need to inspect piston face is not damaged from possible contact

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What Gap for spark plug on 3.5 hp engine? – Briggs & Stratton Briggs Stratton Lawnmower Lawn Mower Short Block
ANSWER : .030 or 76 MM

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17 HP Briggs & Str lawn mower engine that is smoking a lot –
ANSWER : Compression test it can either rent or buy one should be over 90psi!!!

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I have a 12.5 Briggs & Stratton and I can not get the timing marks on the crankshaft and cam gear to line up when the piston is at top dead center.
ANSWER : Timing on briggs is piston past tdc by 6mm….also see if you are 360deg out?

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Hard hitting on compression stroke when starting
ANSWER : If its the 21 or 20 hp OHV single briggs. Adjust vales to .004. The cam also has a decompression that breaks, Causing hard start. So if valves are adjusted and u still have problem. “Could” be cam, remove bottom cover and inspect cam. new cam about 75 to 100 bucks.

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