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Posted on Jan 02, 2017
a 3 hp briggs has about 4.75 inch lbs of torque at the PTO at 3200 rpm.If its an older model engine, reffered to as an L head, Where the valves are mounted in the block next to the cylinder the valves would be set at005 intake and 007 exhaust. If its a newer Over head valve model you would be safe at setting both valves at 005 at TDC remember to use blu loctight on all threaded locations
Posted on Nov 09, 2009
SOURCE: valve clearences
Valve Clearance Cold - Inlet
Valve Clearance Cold - Exhaust : 0.12 - 0.17mm http://www.motorbikespecs.net/index.dyn?flag=2&model_id=2147939&make=Yamaha
This site gives most tech. details required for your bike. Cheers.
Posted on Apr 29, 2010
Remove the spark plug. Turn the flywheel until the piston is at Top Dead Center (TDC) on the compression stroke. Continue to turn the flywheel until the piston drops down 1/4". Set the intake valve at .004" - 006". Adjust the exhaust valve to .006" - .008". You can use a pencil to know that the piston down 1/4". Just put it in the spark plug hole against the top of the piston and then place a mark on the pencil at the lip of the spark plug hole. Now measure up 1/4" and place another mark. Turn the flywheel unit the second mark is flush with the lip. The feeler gauge should be snug but move freely when adjusting the valves. Double check it after locking the rocker arm nut down.
Posted on Oct 18, 2010
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