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I have a 21 hp Briggs and Stratton model #331877, what are the valve settings?

Trying to set valves due to compression lock on start up

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Eugene isn't exactly correct and 1/4" isn't correct or necessary, just make sure the piston is at the top of it's stroke.

.004 ~ .006 for both intake and exhaust

Then roll it over a couple of times, bring it back up and check them again. Then roll it over slowly watching for the compression release. pay close attention to the exhaust valve because they like to wear away from not being adjusted properly

Posted on Apr 28, 2015

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Move crankshaft around so neither valve is raised and set loose at the rocker arm, set at 6mm intake and 8mm exhaust forget about where tdc is

Posted on Apr 21, 2015

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Intake 003 - .005
Exhaust .005 - .007

Adjusted with the piston 1/4" past TDC of compression stroke for each cylinder.

Posted on Apr 10, 2015

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1 Answer

Valve clearance Briggs model# 331877 1371b1


Danny, I set lash at .004" / intake and exhaust clearance. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
http://www4.briggsandstratton.com/miscpdfs/RNT/Engine%20Specifications%20Chart_ms3992.pdf
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Hard hitting on compression stroke when starting


Most Briggs deco vaves are internal and pretty reliable, the valve clearances are very important, if the exhaust valve clerance is too wide the valve lifter will not work, if there is no adjustment yoy would have to fit a new service valve and re do the clerance by removing material from the valve stem

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I need the specs for valves on briggs 21 hp model 331877


I am sorry but you will need to supply the type and code also. Email them to me @ flynow_1@hotmail.com and I can give them to you. Most of these engines are: Intake .003 to .005 and the exhaust @ 005. to 007. I set them in between @: Intake 004. and Exhaust 006.

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1 Answer

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if its hard to get the engine to turn past the compression release then pull your valve coversand try setting your valve lash
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be sure both valves are closed and you are on top dead center TDC of the compression stroke when setting

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