Briggs Garden - Page 3 - Recent Questions, Troubleshooting & Support

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ifixit has the answer. https://www.ifixit.com/Answers/View/171325/briggs+and+stratton+17+hp+ohv+valve+specs

Check wires going to key switch

Most likely cylinder wasnt lubed enough before it was stored. Remove the spark plug, also remove the belt cover behind the chute. Take a few drops of reg 5 30 oil drip in spark plug opening. After sitting a few mins, take a big pair of channel lock pliers and grab ahold of the crankshaft where the belts are and spin shaft in both directions numerous times. Should free up with some effort. If it turns but feels like its jamming up u most likely have a broken connecting rod. But if ran fine when u parked it it should be fine. Once it frees up some, try electric start a few times but double check oil level is okay so cylinder gets proper lube. Should be good to go. Let us know and good luck

The spark plug gap is 0.030". There is a threshold, between 0.028 and 0.031 inches.

The clutches are electro magnetic, so there is an electrical winding inside, once 12 volts is applied to the windings it creates a magnet which draws the centre plates in and engages the pulley, so check you have a 12 volt supply to the clutch, if yes, other than the bearing replacement there is little else that is serviceable.

If it is new, contact your seller for support under warranty https://www.briggsandstratton.com/eu/en_gb/support/faqs/browse/engine-problem-solving-tips.html To start, it needs fuel, air and spark, start by checking if you have all 3

https://www.manualslib.com/manual/863144/Briggs-And-Stratton-Twin-Cylinder-L-Head.html

If you had provided a description of the ignition system it would have made advising you much easier and saved much typing so if the link below isn't helpful please post again with details... https://www.briggsandstratton.com/eu/en_gb/support/faqs/browse/ignition-system-theory-and-testing.html

.004 on both, cold. Be careful of the compression release.

main jet is dirty

Use a business card. That's just about perfect for the gap.

On line go to the Briggs and Stratton co. And download the manual call their 800 number

Most of the time, when the problem is NOT the primer bulb, then it IS the gasket behind it. Sometimes, an easy way to see if there is a blockage (at least on the primer bulbs that have a little hole in the center) is to stick a tiny red tube directly into it and give it a shot with carb cleaner. I hope this helps!

Could also be the governor spring which automatically controls engine rpm. Under load, the governor would rev up engine to keep at optimum cutting rpm. If spring is weak, bent, or mis-adjusted, surging can happen. It is possible to adjust spring, but to do correctly, will need some way to measure rpm, and not to meby, the recommended operating rpm. Might have to replace spring if it is damaged, that is saying it is the spring. I agree with a tune up first. Plug, air filter, and fresh fuel.

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to u.. U can also get free manuals

0.006" inches is good enough. See following link if you want exact. http://faculty.missouri.edu/~schumacherl/276781SingleCylinderOHV.pdf

Check oil level, if ok remove spark plug and crank engine. If it spins then likely "starter stall" due to valve lash out of tolerance. BS OHV engines require periodic adjustment of the valves. If oil level is excessively high then likely engine has hydro-locked... the cylinder(s) are full of oil/fuel due to a stuck carburetor float.

It almost sounds like the blade is loose, the blade acts as a flywheel to the engine, check the blade bolt is tight, tip the mower back on its handles, remove the plug cap, check the bolt tension, normally a 9/16 spanner. If all ok it may have sheared the flywheel key, you can usually tell if either of these things are an issue because the you will get a kick back on the starter handle.